Startseite Multi-condition design optimization of groove flow control technique in an axial-flow pump
Artikel
Lizenziert
Nicht lizenziert Erfordert eine Authentifizierung

Multi-condition design optimization of groove flow control technique in an axial-flow pump

  • Jinghong Li , Rui Zhang EMAIL logo , Hui Xu und Jiangang Feng
Veröffentlicht/Copyright: 7. Oktober 2021
Veröffentlichen auch Sie bei De Gruyter Brill
Informationen für Autor*innen
International Journal of Turbo & Jet-Engines
Aus der Zeitschrift International Journal of Turbo & Jet-Engines Band 40 Heft s1

Abstract

To address the limitations of conventional groove designs in groove flow control technique, this paper optimizes the groove flow control technique for an axial-flow pump combining the design of experiment (DOE), response surface methodology (RSM), and particle swarm optimization (PSO). The sample space is designed using a combination method (OD-LHS) of orthogonal design (OD) and Latin hypercube sampling (LHS). Performance prediction models for the axial-flow pump are established using RSM. Taking the multi-condition comprehensive evaluation function as the final optimization objective, PSO is used to find the optimum groove parameters. The results show that the proposed method is effective in solving multi-condition optimization problems for grooves in axial-flow pumps. The optimal groove length, depth, and distance from the center of the impeller are 0.8, 0.05, and 0.2 times the impeller diameter, respectively, and the number is three times the number of blades. In addition, the optimal grooves effectively improve the hydraulic performance of the axial-flow pump under stall conditions. This study sheds light on the design optimization of the groove flow control technique for axial-flow pumps and other types of hydraulic machinery.

Keywords: axial-flow pump; groove flow control technique; multi-condition design optimization; particle swarm optimization (PSO); response surface methodology (RSM)
Corresponding author: Rui Zhang, College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China; and Key Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education, Chengdu 610039, China, E-mail:

Funding source: The National Natural Science Foundation of China

Award Identifier / Grant number: 51809081

Funding source: The Natural Science Foundation of Jiangsu Province

Award Identifier / Grant number: BK20201315

Funding source: The Open Research Subject of Key Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education

Award Identifier / Grant number: LTDL-2021-002

Funding source: The Fundamental Research Funds for the Central Universities

Award Identifier / Grant number: B200202096

Funding source: The China Postdoctoral Science Foundation

Award Identifier / Grant number: 2019M661707

Funding source: The Jiangsu Planned Projects for Postdoctoral Research Funds

Award Identifier / Grant number: 2019K095

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This study was supported by the National Natural Science Foundation of China (Grant No. 51809081), the Natural Science Foundation of Jiangsu Province (Grant No. BK20201315), the Open Research Subject of Key Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education (Grant No. LTDL-2021-002), the Fundamental Research Funds for the Central Universities (Grant No. B200202096), the China Postdoctoral Science Foundation (Grant No. 2019M661707), and the Jiangsu Planned Projects for Postdoctoral Research Funds (Grant No. 2019K095).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

References

1. Li, DY, Wang, HJ, Qin, YL, Wei, XZ, Qin, DQ. Numerical simulation of hysteresis characteristic in the hump region of a pump-turbine model. Renew Energy 2017;115:433–47.10.1016/j.renene.2017.08.081Suche in Google Scholar

2. Fu, SF, Zheng, Y, Kan, K, Chen, HX, Han, XX, Liang, XL, et al.. Numerical simulation and experimental study of transient characteristics in an axial flow pump during start-up. Renew Energy 2019;146:1879–87.10.1016/j.renene.2019.07.123Suche in Google Scholar

3. Shi, LJ, Zhang, WP, Jiao, HF, Tang, FP, Wang, L, Sun, DD, et al.. Numerical simulation and experimental study on the comparison of the hydraulic characteristics of an axial-flow pump and a full tubular pump. Renew Energy 2020;153:1455–64. https://doi.org/10.1016/j.renene.2020.02.082.Suche in Google Scholar

4. Goltz, I, Kosyna, G, Stark, U, Saathoff, H, Bross, S. Stall inception phenomena in a single-stage axial-flow pump. Proc Inst Mech Eng Part A-J Power Energy 2003;217:471–9. https://doi.org/10.1243/095765003322315531.Suche in Google Scholar

5. Kan, K, Zheng, Y, Chen, YJ, Xie, ZS, Yang, G, Yang, CX. Numerical study on the internal flow characteristics of an axial-flow pump under stall conditions. J Mech Sci Technol 2018;32:4683–95. https://doi.org/10.1007/s12206-018-0916-z.Suche in Google Scholar

6. Pérez Flores, P, Kosyna, G, Wulff, D. Suppression of performance curve instability of an axial-flow pump by using a double-inlet-nozzle. Int J Rotating Mach 2008;2008:1–7. https://doi.org/10.1155/2008/536850.Suche in Google Scholar

7. Qian, Z-D, Wang, F, Guo, ZW, Lu, J. Performance evaluation of an axial-flow pump with adjustable guide vanes in turbine mode. Renew Energy 2016;99:1146–52. https://doi.org/10.1016/j.renene.2016.08.020.Suche in Google Scholar

8. Tao, R, Xiao, RF, Wang, FJ. Detached eddy simulations for high speed axial flow fuel pumps with swept and straight blade impellers. Eng Comput 2016;33:2530–45. https://doi.org/10.1108/ec-06-2015-0165.Suche in Google Scholar

9. Yang, H, Sun, DD, Tang, FP, Liu, C. Research on the performance improvement of axial-flow pump under unstable condition using CFD. Trans Chin Soc Agric Mach 2012;43:138–41+51.Suche in Google Scholar

10. Kurokawa, J, Kamijo, K, Shimura, T. Axial thrust behavior in LOX-pump of rocket engine. J Propul Power 1994;10:244–50. https://doi.org/10.2514/3.23735.Suche in Google Scholar

11. Kurokawa, J. J-groove technique for suppressing various anomalous flow phenomena in turbomachines. Int J Fluid Mach Syst 2011;4:1–13. https://doi.org/10.5293/ijfms.2011.4.1.001.Suche in Google Scholar

12. Kurokawa, J, Imamura, H, Choi, YD. Effect of J-groove on the suppression of swirl flow in a conical diffuser. J Fluid Eng-Trans ASME 2010;132:071101. https://doi.org/10.1115/1.4001899.Suche in Google Scholar

13. Chen, Z, Singh, P, Choi, YD. Suppression of unsteady swirl flow in the draft tube of a Francis hydro turbine model using J-Groove. J Mech Sci Technol 2017;31:5813–20. https://doi.org/10.1007/s12206-017-1123-z.Suche in Google Scholar

14. Saha, S, Kurokawa, J, Matsui, J, Imamura, H. Suppression of performance curve instability of a mixed flow pump by use of J-groove. J Fluid Eng-Trans ASME 2000;122:593–7. https://doi.org/10.1115/1.1287855.Suche in Google Scholar

15. Choi, YD, Kurokawa, J, Imamura, H. Suppression of cavitation in inducers by J-grooves. J Fluid Eng-Trans ASME 2007;129:15–22. https://doi.org/10.1115/1.2375126.Suche in Google Scholar

16. Goltz, I. Entstehung und Unterdrückung der Kennlinieninstabilität einer Axialpumpe. Germany: Grundig Academy; 2006.Suche in Google Scholar

17. Zhang, R. Research on the stall and cavitation flow characteristics and the performance improvement of axial-flow pump [Ph.D. thesis]. China: Shanghai University; 2014.Suche in Google Scholar

18. Feng, JJ, Yang, KF, Zhu, GJ, Luo, XQ, Li, WF. Elimination of hump in axial pump characteristic curve by adopting axial grooves on wall of inlet pipe. Trans Chin Soc Agric Eng 2018;34:105–12.10.15302/J-SSCAE-2018.06.017Suche in Google Scholar

19. Mu, T, Zhang, R, Xu, H, Zheng, Y, Fei, ZD, Li, JH. Study on improvement of hydraulic performance and internal flow pattern of the axial flow pump by groove flow control technology. Renew Energy 2020;160:756–69. https://doi.org/10.1016/j.renene.2020.06.145.Suche in Google Scholar

20. Chen, Z, Baek, S, Cho, H, Choi, YD. Optimal design of J-groove shape on the suppression of unsteady flow in the Francis turbine draft tube. J Mech Sci Technol 2019;33:2211–8. https://doi.org/10.1007/s12206-019-0423-x.Suche in Google Scholar

21. Shrestha, U, Choi, YD. Suppression of flow instability in the Francis hydro turbine draft tube by J-groove shape optimization at a partial flow rate. J Mech Sci Technol 2021;35:2523–33. https://doi.org/10.1007/s12206-021-0523-2.Suche in Google Scholar

22. Kim, J-H, Lee, H-C, Kim, J-H, Choi, Y-S, Yoon, J-Y, Yoo, I, et al.. Improvement of hydrodynamic performance of a multiphase pump using design of experiment techniques. J Fluid Eng-Trans ASME 2015;137:081301. https://doi.org/10.1115/1.4029890.Suche in Google Scholar

23. Kim, S, Lee, K-Y, Kim, J-H, Kim, J-H, Jung, U-H, Choi, Y-S. High performance hydraulic design techniques of mixed-flow pump impeller and diffuser. J Mech Sci Technol 2015;29:227–40. https://doi.org/10.1007/s12206-014-1229-5.Suche in Google Scholar

24. Zhang, JY, Zhu, HW, Yang, C, Li, Y, Wei, H. Multi-objective shape optimization of helico-axial multiphase pump impeller based on NSGA-II and ANN. Energy Convers Manag 2011;52:538–46. https://doi.org/10.1016/j.enconman.2010.07.029.Suche in Google Scholar

25. Lian, YS, Liou, M-S. Multiobjective optimization using coupled response surface model and evolutionary algorithm. AIAA J 2005;43:1316–25. https://doi.org/10.2514/1.12994.Suche in Google Scholar

26. Miao, FQ, Park, H-S, Kim, C, Ahn, S. Swarm intelligence based on modified PSO algorithm for the optimization of axial-flow pump impeller. J Mech Sci Technol 2015;29:4867–76. https://doi.org/10.1007/s12206-015-1034-9.Suche in Google Scholar

27. Park, HS, Miao, FQ. Multi-objective optimization by using modified PSO algorithm for axial flow pump impeller. Adv Intell Syst Comput 2015;319:223–37.10.1007/978-3-319-11457-6_16Suche in Google Scholar

28. Pei, J, Wang, WJ, Osman, M, Gan, XC. Multiparameter optimization for the nonlinear performance improvement of centrifugal pumps using a multilayer neural network. J Mech Sci Technol 2019;33:2681–91. https://doi.org/10.1007/s12206-019-0516-6.Suche in Google Scholar

29. Wang, WJ, Pei, J, Yuan, SQ, Gan, XC, Yin, TY. Artificial neural network for the performance improvement of a centrifugal pump. IOP Conf Ser Earth Environ Sci 2019;240:032024. https://doi.org/10.1088/1755-1315/240/3/032024.Suche in Google Scholar

30. Zhang, DS, Shi, WD, Chen, B, Guan, XF. Unsteady flow analysis and experimental investigation of axial-flow pump. J Hydrodyn 2010;22:35–43. https://doi.org/10.1016/s1001-6058(09)60025-1.Suche in Google Scholar

31. Spalart, P, Shur, M. On the sensitization of turbulence models to rotation and curvature. Aero Sci Technol 1997;1:297–302. https://doi.org/10.1016/s1270-9638(97)90051-1.Suche in Google Scholar

32. Smirnov, P, Menter, F. Sensitization of the SST turbulence model to rotation and curvature by applying the spalart–shur correction term. J Turbomach-Trans ASME 2009;131:041010. https://doi.org/10.1115/1.3070573.Suche in Google Scholar

33. Celik, I, Ghia, U, Roache, PJ, Freitas, C, Coloman, H, Raad, P. Procedure of estimation and reporting of uncertainty due to discretization in CFD applications. J Fluid Eng-Trans ASME 2008;130:078001. https://doi.org/10.1115/1.2960953.Suche in Google Scholar

34. Liu, N, Wang, Y, Zhang, G. The pump models test of the South-to-North Water Diversion Project. Beijing, China: China Water & Power Press; 2006.Suche in Google Scholar

35. Shim, H-S, Afzal, A, Kim, K-Y, Jeong, H-S. Three-objective optimization of a centrifugal pump with double volute to minimize radial thrust at off-design conditions. Proc Inst Mech Eng Part A-J Power Energy 2016;230:598–615. https://doi.org/10.1177/0957650916656544.Suche in Google Scholar

36. Xu, Y, Tan, L, Cao, SL, Qu, WS. Multiparameter and multiobjective optimization design of centrifugal pump based on orthogonal method. Proc Inst Mech Eng Part C-J Eng Mech Eng Sci 2017;231:2569–79. https://doi.org/10.1177/0954406216640303.Suche in Google Scholar

37. Kwak, J-S. Application of Taguchi and response surface methodologies for geometric error in surface grinding process. Int J Mach Tool Manufact 2005;45:327–34. https://doi.org/10.1016/j.ijmachtools.2004.08.007.Suche in Google Scholar

38. Myers, RH, Montgomery, DC, Anderson-Cook, C. Response surface methodology: process and product optimization using designed experiments. New Jersey: Wiley, Hoboken; 2016.Suche in Google Scholar

39. Kennedy, J, Obaiahnahatti, BG, editors. Particle swarm optimization. In: Proceedings of the 1995 IEEE international conference on neural networks. Perth. IEEE; 1995.Suche in Google Scholar

40. Delgarm, N, Sajadi, B, Kowsary, F, Delgarm, S. Multi-objective optimization of the building energy performance: a simulation-based approach by means of particle swarm optimization (PSO). Appl Energy 2016;170:293–303. https://doi.org/10.1016/j.apenergy.2016.02.141.Suche in Google Scholar

41. Sharafi, M, Elmekkawy, T. Multi-objective optimal design of hybrid renewable energy systems using PSO-simulation based approach. Renew Energy 2014;68:67–79. https://doi.org/10.1016/j.renene.2014.01.011.Suche in Google Scholar

42. Fan, MY, Hu, JW, Cao, RS, Xiong, KN, Wei, XH. Modeling and prediction of copper removal from aqueous solutions by nZVI/rGO magnetic nanocomposites using ANN-GA and ANN-PSO. Sci Rep 2017;7:18040. https://doi.org/10.1038/s41598-017-18223-y.Suche in Google Scholar PubMed PubMed Central

43. Qian, XD. Research on improving hydraulic instability of axial flow pump by J-Groove control technology [MS thesis]. China: Hohai University; 2018.Suche in Google Scholar
Received: 2021-09-24
Accepted: 2021-09-25
Published Online: 2021-10-07

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. The International Journal of Turbo and Jet Engines
  3. The aerothermodynamic cycle optimal design of a turbofan engine
  4. Multi-condition design optimization of groove flow control technique in an axial-flow pump
  5. Analysis on impulse characteristics of pulse detonation engine with nozzles
  6. Numerical investigation on implication of innovative hydrogen strut injector on performance and combustion characteristics in a scramjet combustor
  7. Optimization of Kiel geometry for better recovery factor in high temperature measurement in aero gas turbine engine
  8. Applicability of correlational data-mining to small-scale turbojet performance map generation
  9. Effect of multi-zone effusion cooling on an adiabatic flat plate for gas turbine application
  10. Flow quality improvement of the wind tunnel testing for a highly-loaded compressor cascade at high incidence
  11. Modeling and analysis of 3D radiative heat transfer in combustor
  12. A creep-fatigue life prediction model considering multi-factor coupling effect
  13. Optimization-based transient control of turbofan engines: a sequential quadratic programming approach
  14. Investigations on the interaction between the front and aft purge flow and the downstream vane of 1.5-stage turbine
  15. A study on design optimization for compressor blisks
  16. Exploration of an unconventional validation tool to investigate aero engine transonic fan flutter signature
  17. Evaluation of non-uniform water film behavior on the performance of an axial aeroengine compressor
  18. Predicting remaining useful life of turbofan engines using degradation signal based echo state network
  19. Effect of G-type integral squeeze film damper on the dynamic characteristics in rotor system
  20. Development of a one-dimensional code for the initial design of a micro gas turbine mixed flow compressor stage
  21. Numerical and experimental investigations of tip clearance effects in a high-flow-coefficient centrifugal compressor
  22. Experimental and numerical investigation on the effect of turboprop engine exhaust gas impingement on pusher aircraft
  23. Heat transfer distribution of single oblique jet impingement in crossflow under different inlet conditions
  24. Performance enhancement and flow separation control in an S-duct by air injection
  25. Gas dynamic analysis of the modern single shaft gas turbine engine flow path
  26. Aero engine health monitoring, diagnostics and prognostics for condition-based maintenance: an overview
  27. Influence of leading edge point on aerodynamic performance of asymmetric leading edge compressor airfoils
  28. The aerothermal performance of turbine blade squealer tip at various Reynolds numbers and Mach numbers with moving endwall
  29. Numerical investigation of a variable stator vane with nonuniform partial radial gaps in an annular compressor cascade
  30. Effect of self-recirculating casing treatment on the unsteady flow and stability of counter-rotating axial-flow compressor
  31. Research on temperature rise characteristics of end V-groove ring seal
  32. Research on the influence of honeycomb cell blockage on the seal leakage characteristics
  33. Vortex structure control based bleed in axial compressor cascade with tip clearance using large eddy simulation
  34. Development and application of a profile loss model considering the low-Re effect in low-pressure turbine
  35. Optimization of ACE mode transition control schedule considering geometric adjustment speed
  36. Numerical investigation of flow control in low-pressure turbine cascade using Gurney Flaps
  37. The design method of the V-shaped groove piston ring
  38. Control of subsonic jets using vanes as vortex generators
  39. Impact investigation of inlet environmental changes on the rated condition performance of a high-pressure compressor
  40. Research on new integral squeeze film damper vibration control of micro turbojet engine at high speed
  41. Effect of the distribution of the upstream probe support on performance of compressor cascade
  42. Effect of bypass ratio on sonic underexpanded co-flow jets with finite lip thickness
  43. Machine learning augmented multi-sensor data fusion to detect aero engine fan rotor blade flutter
  44. CFD analysis of flow control in compressor cascade using MVGs
  45. Quantitative investigation of the evaporation and resistance characteristics of inlet jet precooling
  46. Study on laser de-weight and dynamic balance technology of rotating machines
  47. Integrated design and analysis of inlet and missile with two side layout
  48. Research on turboprop engine control method based on linear parameter varying model
  49. Modeling and validation of the volume effect on the axial fan transient performance
  50. Ground effects on the aerodynamics of a wing with slot type distributed propulsion system for VTOL applications
  51. Multidisciplinary sensitivity analysis for turbine blade considering thickness uncertainties
  52. Accurate measurement and evaluation method of axial compressor efficiency under the influence of multiple factors
  53. Control mechanism of secondary flow in a turbine cascade with non-axisymmetric endwall profiling under Co-rotating incoming vortex
  54. Infrared simulation of aircraft rear fuselage based on a coupled CFD method
  55. Effect of multi-hole trench cooling on an adiabatic flat plate for gas turbine application
  56. Numerical study of transition process in different zones of a compressor cascade channel
https://doi.org/10.1515/tjj-2021-0051
Schlagwörter für diesen Artikel
axial-flow pump; groove flow control technique; multi-condition design optimization; particle swarm optimization (PSO); response surface methodology (RSM)

Artikel in diesem Heft

  1. Frontmatter
  2. The International Journal of Turbo and Jet Engines
  3. The aerothermodynamic cycle optimal design of a turbofan engine
  4. Multi-condition design optimization of groove flow control technique in an axial-flow pump
  5. Analysis on impulse characteristics of pulse detonation engine with nozzles
  6. Numerical investigation on implication of innovative hydrogen strut injector on performance and combustion characteristics in a scramjet combustor
  7. Optimization of Kiel geometry for better recovery factor in high temperature measurement in aero gas turbine engine
  8. Applicability of correlational data-mining to small-scale turbojet performance map generation
  9. Effect of multi-zone effusion cooling on an adiabatic flat plate for gas turbine application
  10. Flow quality improvement of the wind tunnel testing for a highly-loaded compressor cascade at high incidence
  11. Modeling and analysis of 3D radiative heat transfer in combustor
  12. A creep-fatigue life prediction model considering multi-factor coupling effect
  13. Optimization-based transient control of turbofan engines: a sequential quadratic programming approach
  14. Investigations on the interaction between the front and aft purge flow and the downstream vane of 1.5-stage turbine
  15. A study on design optimization for compressor blisks
  16. Exploration of an unconventional validation tool to investigate aero engine transonic fan flutter signature
  17. Evaluation of non-uniform water film behavior on the performance of an axial aeroengine compressor
  18. Predicting remaining useful life of turbofan engines using degradation signal based echo state network
  19. Effect of G-type integral squeeze film damper on the dynamic characteristics in rotor system
  20. Development of a one-dimensional code for the initial design of a micro gas turbine mixed flow compressor stage
  21. Numerical and experimental investigations of tip clearance effects in a high-flow-coefficient centrifugal compressor
  22. Experimental and numerical investigation on the effect of turboprop engine exhaust gas impingement on pusher aircraft
  23. Heat transfer distribution of single oblique jet impingement in crossflow under different inlet conditions
  24. Performance enhancement and flow separation control in an S-duct by air injection
  25. Gas dynamic analysis of the modern single shaft gas turbine engine flow path
  26. Aero engine health monitoring, diagnostics and prognostics for condition-based maintenance: an overview
  27. Influence of leading edge point on aerodynamic performance of asymmetric leading edge compressor airfoils
  28. The aerothermal performance of turbine blade squealer tip at various Reynolds numbers and Mach numbers with moving endwall
  29. Numerical investigation of a variable stator vane with nonuniform partial radial gaps in an annular compressor cascade
  30. Effect of self-recirculating casing treatment on the unsteady flow and stability of counter-rotating axial-flow compressor
  31. Research on temperature rise characteristics of end V-groove ring seal
  32. Research on the influence of honeycomb cell blockage on the seal leakage characteristics
  33. Vortex structure control based bleed in axial compressor cascade with tip clearance using large eddy simulation
  34. Development and application of a profile loss model considering the low-Re effect in low-pressure turbine
  35. Optimization of ACE mode transition control schedule considering geometric adjustment speed
  36. Numerical investigation of flow control in low-pressure turbine cascade using Gurney Flaps
  37. The design method of the V-shaped groove piston ring
  38. Control of subsonic jets using vanes as vortex generators
  39. Impact investigation of inlet environmental changes on the rated condition performance of a high-pressure compressor
  40. Research on new integral squeeze film damper vibration control of micro turbojet engine at high speed
  41. Effect of the distribution of the upstream probe support on performance of compressor cascade
  42. Effect of bypass ratio on sonic underexpanded co-flow jets with finite lip thickness
  43. Machine learning augmented multi-sensor data fusion to detect aero engine fan rotor blade flutter
  44. CFD analysis of flow control in compressor cascade using MVGs
  45. Quantitative investigation of the evaporation and resistance characteristics of inlet jet precooling
  46. Study on laser de-weight and dynamic balance technology of rotating machines
  47. Integrated design and analysis of inlet and missile with two side layout
  48. Research on turboprop engine control method based on linear parameter varying model
  49. Modeling and validation of the volume effect on the axial fan transient performance
  50. Ground effects on the aerodynamics of a wing with slot type distributed propulsion system for VTOL applications
  51. Multidisciplinary sensitivity analysis for turbine blade considering thickness uncertainties
  52. Accurate measurement and evaluation method of axial compressor efficiency under the influence of multiple factors
  53. Control mechanism of secondary flow in a turbine cascade with non-axisymmetric endwall profiling under Co-rotating incoming vortex
  54. Infrared simulation of aircraft rear fuselage based on a coupled CFD method
  55. Effect of multi-hole trench cooling on an adiabatic flat plate for gas turbine application
  56. Numerical study of transition process in different zones of a compressor cascade channel
Jetzt anmelden und 20% sparen
Institutioneller Zugang
Wie funktioniert Authentifizierung?
Haben Sie eine Idee, wie wir unsere Website verbessern können?
Bitte schreiben Sie uns.
© 2025 De Gruyter Brill
Heruntergeladen am 9.9.2025 von https://www.degruyterbrill.com/document/doi/10.1515/tjj-2021-0051/html
Button zum nach oben scrollen