Investigations of modified cooling hole injection angle configurations for improved trench film cooling performance
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Krishna Anand Vasudevan Girija
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Parammasivam Kanjikoil Mahali
Abstract
This study aims to evaluate the film-cooling performance of trench film cooling with a modified cooling hole injection angle configuration. Five different film hole injection angle configurations viz., forward injection 30°, forward injection 60°, perpendicular injection 90°, backward injection 60°, and backward injection 30° were tested for their performance through Computational fluid dynamic simulation. All the configurations were tested on a trench with a fixed length of 2 times and depth of 0.75 times the film hole diameter. The investigation was conducted at three blowing ratios of 0.4, 1.2, and 2.0. The experimental results of trench film cooling effectiveness with a backward injection of 30° show a close agreement with the computational data. The backward injection 30° film hole configuration has improved the spatially averaged film cooling effectiveness on the trench test surface by 29.41 % at a blowing ratio of 0.4, 30.65 % at a blowing ratio of 1.2, and 47.18 % at a blowing ratio of 2.0.
Acknowledgment
The author gratefully acknowledges the Department of Science and Technology, Government of India for the financial support through the DST INSPIRE fellowship.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission. Krishna Anand – meshing, modelling, CFD analysis, writing. Parammasivam – results analysis and writing.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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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: Not applicable.
Nomenclature
- D
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film hole diameter (mm);
- L/D
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length to the diameter ratio of the film cooling hole;
- P/D
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pitch to the diameter ratio of the film cooling hole;
- X/D
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dimensionless streamwise length of the test wall surface;
- Y/D
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dimensionless vertical extension from the test wall surface;
- Z/D
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dimensionless span side extension of the test wall surface;
- FCE
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ilm cooling effectiveness
Greek symbols
- α
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film hole injection angle (°)
- ƞ
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local film cooling effectiveness
- θ
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dimensionless temperature parameter
- ρ
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density of flow (kg/m3)
Subscripts
- ∞
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free stream
- aw
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adiabatic wall
- SA
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spatially average
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© 2025 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
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- 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
