Impact of annular ribs in sudden expansion flow conditions to control base pressure
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Vijayaraja Kengaiah
,
Senthilkumar Chidambaram
Abstract
The experimental findings on the properties of an suddenly expanded flow from convergent nozzle is presented in this article. For suddenly expanded subsonic, sonic and underexpanded flows, the effect of passive control in the form of an annular rib on the base pressure distribution along the enlarged duct is examined. The range of the nozzle pressure ratio (NPR) was 1–7. The enlarged duct’s length-to-diameter ratio was adjusted from the base to 0.5D to 6D. The rib’s aspect ratio was adjusted between 0.45 and 1.25. The experimental findings demonstrate that, in the absence of ribs, the base pressure is highly impacted by the flow Mach number, the degree of expansion at the nozzle exit, and the length-to-diameter ratio of the enlarged duct. The base pressure of a sonic jet with NPR 4 rises as the rib aspect ratio does as well. The current study clearly shows that, in a suddenly expanded axi-symmetric duct, the base pressure can be managed passively by using a rib with the proper aspect ratio. This prevents wall pressure oscillations from rising to an unacceptably high level in subsonic and appropriately and underexpanded sonic flow.
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Research ethics: Not applicable. The paper is not currently being considered for publication elsewhere. The paper reflects the authors own research and analysis in a truthful and complete manner.
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Informed consent: We the authors give our consent for the publication of the details within the text to be published in the Journal of turbo and jet engines.
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Author contributions: The authors has accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: Quillbot, an AI based tool was used for grammar checking. All writing, analysis and interpretation were done by authors.
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Conflict of interest: The authors state no conflict of interest
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Research funding: None declared
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Data availability: The raw data can be obtained on request from the first author, Vijayaraja Kengaiah.
Nomenclature (SI Units)
- NPR
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nozzle pressure ratio;
- D
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diameter of the enlarged duct (mm);
- L
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length of the enlarged duct (mm);
- p0
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stagnation pressure (N/m2);
- pb
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back pressure (N/m2);
- pa
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ambient pressure (N/m2);
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© 2025 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Simulation and analysis of the over-expanded flow field in asymmetric nozzles with lateral expansion
- Design optimization of a fluidic thrust vectoring system based on coanda effect using meta-models
- Research on vibration damping of integral squeeze film damper based on fan rotor tester of turbofan
- Influence of conical shaft stiffness on the dynamic characteristics of flexible rotor
- A novel design methodology for preventing dislocation in the Zig-zag shroud
- Numerical study of effect of the casing slot on the tip leakage vortex and vortex cavitation of a fuel pump
- Multi-parameter study on array-jets impingement with crossflow temperature effect
- Exploration of shock-induced flow dynamics and turbulence-driven combustion optimization in advanced cavity configurations of hydrogen fueled scramjet combustors
- A part-load performance analysis method for gas turbines based on the stage by stages model of the power turbine
- Effect of lip-thickness on rectangular nozzle co-flowing subsonic jet
- Numerical analysis of pollutant formation and exhaust emission in a short annular combustor under part load operation
- Analysis of leakage characteristics and structural optimization of two-stage floating ring seal
- Hypersonic boundary layer flow at an axisymmetric stagnation point on a blunt body
- Numerical simulations of a turbulent lifted hydrogen flame in vitiated coflow with flamelet generated manifold approach
- Optimization of labyrinth seal leakage with independently varied tooth parameters using efficient global optimization
- Investigations of modified cooling hole injection angle configurations for improved trench film cooling performance
- Influence of non-axisymmetric endwall profiling under incoming vortex on the corner separation of a diffusion cascade
- Impact of annular ribs in sudden expansion flow conditions to control base pressure
- Effect of preheated swirling multi-annular jets on mixing and flow characteristics in various expanded confinements
Artikel in diesem Heft
- Frontmatter
- Simulation and analysis of the over-expanded flow field in asymmetric nozzles with lateral expansion
- Design optimization of a fluidic thrust vectoring system based on coanda effect using meta-models
- Research on vibration damping of integral squeeze film damper based on fan rotor tester of turbofan
- Influence of conical shaft stiffness on the dynamic characteristics of flexible rotor
- A novel design methodology for preventing dislocation in the Zig-zag shroud
- Numerical study of effect of the casing slot on the tip leakage vortex and vortex cavitation of a fuel pump
- Multi-parameter study on array-jets impingement with crossflow temperature effect
- Exploration of shock-induced flow dynamics and turbulence-driven combustion optimization in advanced cavity configurations of hydrogen fueled scramjet combustors
- A part-load performance analysis method for gas turbines based on the stage by stages model of the power turbine
- Effect of lip-thickness on rectangular nozzle co-flowing subsonic jet
- Numerical analysis of pollutant formation and exhaust emission in a short annular combustor under part load operation
- Analysis of leakage characteristics and structural optimization of two-stage floating ring seal
- Hypersonic boundary layer flow at an axisymmetric stagnation point on a blunt body
- Numerical simulations of a turbulent lifted hydrogen flame in vitiated coflow with flamelet generated manifold approach
- Optimization of labyrinth seal leakage with independently varied tooth parameters using efficient global optimization
- Investigations of modified cooling hole injection angle configurations for improved trench film cooling performance
- Influence of non-axisymmetric endwall profiling under incoming vortex on the corner separation of a diffusion cascade
- Impact of annular ribs in sudden expansion flow conditions to control base pressure
- Effect of preheated swirling multi-annular jets on mixing and flow characteristics in various expanded confinements
