Nozzle Geometry Effect on Twin Jet Flow Characteristics
-
Muthuram A
,
Rakesh Divvela
Abstract
Effect of nozzle geometries on the propagation of twin jet issuing from nozzles with circle-circle, circle-ellipse, circle-triangle, circle-square, circle-hexagon and circle-star geometrical combinations was investigated for Mach numbers 0.2, 0.4, 0.6 and 0.8. In all the cases, both jets in the twin jet had the same Mach number. All the twin jets of this study are free jets, discharged into stagnant ambient atmosphere. The result of the twin jets issuing from circle-circle nozzle is kept as the reference in this study. For all the twin jet nozzles, the inter nozzle spacing; the distance between the nozzle axes (S) was 20 mm and all the nozzles had an equivalent area of 78.5 mm2. Thus for all the cases of the present study, S/D ratio is 2. The results show that the mixing of the combined jet, after the merging point is strongly influenced by the combined effect of the nozzle geometry and jet Mach number. Among the six different twin jet nozzle configuration studied, circle-square combination is found to be the most superior mixing promoter.
Nomenclature
- D
-
nozzle exit diameter
- M
-
Mach number
- S
-
Jet spacing
- U
-
Mean velocity in the X-direction
- X
-
Streamwise coordinate along centerline
- Y
-
Coordinate normal to the centerline
- Z
-
Coordinate normal to ground plane
- CMD
-
Centerline Mach number Decay
- e
-
Nozzle exit conditions
References
1. Tanaka E. The interference of two-dimensional parallel jets, 1st report, experiments on dual jet. Bull JSME. 1970;13:272–80. DOI:10.1299/jsme1958.13.272.Suche in Google Scholar
2. Tanaka E. The interference of two-dimensional parallel jets, 2nd report, experiments on the combined flow of dual jet. Bull JSME. 1974;17:920–7. DOI:10.1299/jsme1958.17.1920.Suche in Google Scholar
3. Moustafa GH. Experimental investigation of high-speed twin jets. AIAA J. 1994;32:2320–2. DOI:10.2514/3.12293.Suche in Google Scholar
4. Anderson. EA, Spall RE. Experimental and numerical investigation of two-dimensional parallel jets. J Fluids Eng Trans ASME. 2001;123:401–6. DOI:10.1115/1.1363701.Suche in Google Scholar
5. Murai K, Taga M, Akagawa K. An experimental study on confluence of two two-dimensional jets. Bull JSME. 1976;19:958–64.DOI:10.1299/jsme1958.19.958.Suche in Google Scholar
6. Rathakrishnan E, Vijayabhaskar Reddy P, Padmanaban K. Some studies on twinjet propagation. Mech Res Commun. 1989;16:279–87. DOI:10.1016/0093-6413(89)90063-3.Suche in Google Scholar
7. Yin Z, Zhang H, Lin J. Experimental study on the flow field characteristics in the mixing region of twin jets. J Hydrodyn Ser B. 2007;19:309–13.10.1016/S1001-6058(07)60063-8Suche in Google Scholar
8. Mi J, Kalt P, Nathan GJ. Mixing characteristics of a notched-rectangular jet and circular jet. In: 15th Australasian fluid mechanics conference. Australia: Sydney, 2004.Suche in Google Scholar
9. Mi J, Nathan GJ, Luxton RE. Centreline mixing characteristics of jets from nine differently shaped nozzles. Exp Fluids. 2000;28:93–4.10.1007/s003480050012Suche in Google Scholar
10. Zaman KB. Spreading characteristics of compressible jets from nozzles of various geometries. J Fluid Mech. 1999;383:197–228. DOI:10.1017/S0022-11099003833.Suche in Google Scholar
11. Ghanshyam S, Sundararajan T, Bhaskaran KA. Mixing and entrainment characteristics of circular and non circular confined jets. J Fluids Eng. 2003;125:835–42. DOI:10.1115/1.1595676.Suche in Google Scholar
12. Durve A, Patwardhan AW, Banarjee I, Padmakumar G, Vaidyanathan G. Numerical investigation of mixing in parallel jets. Nucl Eng Des. 2012;242:78–90. DOI:10.1016/j.nucengdes.2011.10.051.Suche in Google Scholar
13. Hashiebaf A, Romano GP. Particle image velocimetry investigation on mixing enhancement of non-circular sharp-edged nozzles. Int J Heat Fluid Flow. 2013;44:208–21. DOI:10.1016/j.ijheatfluidflow.2013.05.017.Suche in Google Scholar
14. Seyed SA, Mark FT, Mikhail K. PIV measurements in the near and intermediate field regions of jets issuing from eight different nozzle geometries. Flow Turbulent Combust. 2017;99:329–51. DOI:10.1007/s10494-017-9820-3.Suche in Google Scholar
15. Miller RS, Madnia CK, Givi PV. Numerical simulation of non circular jets. Pergamon Comput Fluids. 1995;24:1–25. DOI:10.1016/0045-7930(94)00019-U.Suche in Google Scholar
16. Gutmark EJ, Grinstein FF. Flow control with non-circular jets. Ann Rev Fluid Mech. 1999;31:239–72. DOI:10.1146/annurev.fluid.31.1.239.Suche in Google Scholar
17. Papamoschou D, Roshko A. The compressible turbulent shear layer: an experimental study. J Fluid Mech. 1988;197:453–77. DOI:10.1017/S0022112088003325.Suche in Google Scholar
18. Elbanna H, Gahin S. Investigation of two plane parallel jets. AIAA J. 1983;21: 986–91. DOI:10.2514/3.8187.Suche in Google Scholar
19. Lin YF, Sheu MJ. Investigation of two plane parallel unventilated jets. Exp Fluids. 1990;10:17–22. DOI:10.1007/BF00187867.Suche in Google Scholar
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Artikel in diesem Heft
- Frontmatter
- Original Research Articles
- Novel Closed-Form Equation for Critical Pressure and Optimum Pressure Ratio for Turbojet Engines
- Development of Combustor for a Hybrid Turbofan Engine
- A Parametric Study of Hydrogen Fuel Effects on Exergetic, Exergoeconomic and Exergoenvironmental Cost Performances of an Aircraft Turbojet Engine
- A Model Reference Adaptive Sliding Mode Control Method for Aero-Engine
- Numerical Study of Mixing Enhancement in 2D Supersonic Ejector
- Flow Development Through An S-Shaped Diffusing Duct
- Nozzle Geometry Effect on Twin Jet Flow Characteristics
- Application of Proper Orthogonal Decomposition Method in Unsteady Flow Field Analysis of Axial High Bypass Fan
- A Research on Aero-engine Control Based on Deep Q Learning
- Blade Number Selection for a Splittered Mixed-Flow Compressor Impeller Using Improved Loss Model
- Study of Correctly Expanded Sonic Jet with Air Tabs
- Large-Eddy Simulation of Shaped Hole Film Cooling with the Influence of Cross Flow
- Modal Analysis of the Axial Compressor Blade: Advanced Time-Dependent Electronic Interferometry and Finite Element Method
- Exergy Analysis of a Turboprop Engine at Different Flight Altitude and Speeds Using Novel Consideration
- Thermal Optimization Design of Heat Exchanger in Supersonic Engine with Parameters’ Fluctuation
Artikel in diesem Heft
- Frontmatter
- Original Research Articles
- Novel Closed-Form Equation for Critical Pressure and Optimum Pressure Ratio for Turbojet Engines
- Development of Combustor for a Hybrid Turbofan Engine
- A Parametric Study of Hydrogen Fuel Effects on Exergetic, Exergoeconomic and Exergoenvironmental Cost Performances of an Aircraft Turbojet Engine
- A Model Reference Adaptive Sliding Mode Control Method for Aero-Engine
- Numerical Study of Mixing Enhancement in 2D Supersonic Ejector
- Flow Development Through An S-Shaped Diffusing Duct
- Nozzle Geometry Effect on Twin Jet Flow Characteristics
- Application of Proper Orthogonal Decomposition Method in Unsteady Flow Field Analysis of Axial High Bypass Fan
- A Research on Aero-engine Control Based on Deep Q Learning
- Blade Number Selection for a Splittered Mixed-Flow Compressor Impeller Using Improved Loss Model
- Study of Correctly Expanded Sonic Jet with Air Tabs
- Large-Eddy Simulation of Shaped Hole Film Cooling with the Influence of Cross Flow
- Modal Analysis of the Axial Compressor Blade: Advanced Time-Dependent Electronic Interferometry and Finite Element Method
- Exergy Analysis of a Turboprop Engine at Different Flight Altitude and Speeds Using Novel Consideration
- Thermal Optimization Design of Heat Exchanger in Supersonic Engine with Parameters’ Fluctuation
