CFD Analysis of Film Cooling

Na, Sangkwon; Zhu, Bo; Bryden, Mark; Shih, Tsan‐Hsing

doi:10.2514/6.2006-22

Cited by 18 publications

(12 citation statements)

References 12 publications

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“…The laterallyaveraged effectiveness of the detached jet at ideal M =2.0 is not accurately simulated, with the prediction indicating much higher average effectiveness downstream of s/d=5. The performance of the SST k-ω model for maximum and laterallyaveraged effectiveness is consistent with simulations of filmcooling presented in the literature ( [20], [34]).…”

Section: Film-cooling Measurements and Predictionssupporting

confidence: 85%

Computational Predictions of Heat Transfer and Film-Cooling for a Turbine Blade With Non-Axisymmetric Endwall Contouring

Lynch

Thole

Kohli

et al. 2010

Volume 4: Heat Transfer, Parts a and B

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Three-dimensional contouring of the compressor and turbine endwalls in a gas turbine engine has been shown to be an effective method of reducing aerodynamic losses by mitigating the strength of the complex vortical structures generated at the endwall. Reductions in endwall heat transfer in the turbine have been also previously measured and reported in the literature. In this study, computational fluid dynamics simulations of a turbine blade with and without non-axisymmetric endwall contouring were compared to experimental measurements of the exit flowfield, endwall heat transfer and endwall film-cooling. Secondary kinetic energy at the cascade exit was closely predicted with a simulation using the SST k-ω turbulence model. Endwall heat transfer was overpredicted in the passage for both the SST k-ω and realizable k-ε turbulence models, but heat transfer augmentation for a non-axisymmetric contour relative to a flat endwall showed fair agreement to the experiment. Measured and predicted film-cooling results indicated that the non-axisymmetric contouring limits the spread of film-cooling flow over the endwall depending upon the interaction of the film with the contour geometry.

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Section: Film-cooling Measurements and Predictionssupporting

confidence: 85%

Computational Predictions of Heat Transfer and Film-Cooling for a Turbine Blade With Non-Axisymmetric Endwall Contouring

Lynch

Thole

Kohli

et al. 2010

Volume 4: Heat Transfer, Parts a and B

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“…A number of RANS simulations have been carried out on film cooling flow fields on a flat plate. Na et al [5], Leylek et al. [6] reported that laterally averaged film effectiveness showed good agreement with the experimental results, but the RANS simulation under-estimated lateral spreading of film cooling.…”

Section: Introductionmentioning

confidence: 76%

“…3. The geometry of the computational domain is almost identical to the ones used in the simulations of Na et al [5], Leylek et al [6] and Mizukami et al [3]. The domain consists of a main stream region, a circular cooling : cooling air center : center line (y/d=0) lat : laterally averaged (-1.5≤y/d≤1.5) spa : spatially averaged (0≤x/d≤11, -1.5≤y/d≤1.5) f fluid m : main stream rms : root mean square hole and a plenum chamber.…”

Section: Grid System Flat Plate Configurationmentioning

confidence: 99%

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Numerical Study on Flat Plate and Leading Edge Film Cooling

Shimizu

Takahashi

Funazaki

et al. 2009

Volume 3: Heat Transfer, Parts a and B

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This study describes a 3-D computation for film cooling effectiveness investigation using Fluent commercial code, version 6.2. Two configurations are examined: (1) Flat plate, and (2) Semi-cylindrical leading edge with a flat after-body. Three different RANS turbulence models and DES based on Spalart-Allmaras model are utilized to see the difference in accuracy between DES and RANS approaches. Similar to the previous RANS simulation, lateral spreading of film cooling is under-estimated in the RANS simulation, while in the DES, lateral spreading of film cooling is enhanced and shows adequate agreement with the previous experiments. The effects of velocity magnitude and orientation of plenum flow on film cooling effectiveness are also studied in the flat plate configuration. The plenum flow is eventually found to have a strong impact on the flow structure in the cooling pipe, and the distorted velocity profile in the pipe consequently lowers film cooling effectiveness, in particularly at high blowing ratio.

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“…As for the CFD technique, Walters and Leylek (15) , Na et al (16) , and also Mizukami et al (17) indicated that the steady RANS calculation tends to underpredict the lateral diffusion of film-cooling air on the blade surface. This was ascribed to the fact that the RANS analysis does not correctly represent turbulent anisotropic behaviors induced by the vortices downstream of the film-cooling holes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Heat Transfer Coefficient and Film-Cooling Performance Influenced by the Orientation of Internal Turbulence Promoting Ribs

Agata

Takahashi

Shimizu

et al. 2013

JTST

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Heat transfer coefficient and film-cooling performance have been studied numerically by using the detached eddy simulations. The detailed characteristics of heat transfer coefficient influenced by the orientation of internal turbulence promoting ribs are examined. The heat transfer coefficient and the adiabatic film cooling effectiveness reported previously are discussed with relation to the flow structures of the film-cooling air. Those simulation results are combined to evaluate the net heat flux reduction and the net surface temperature reduction. The effects of the rib orientation on the evaluated film-cooling performance are discussed based on the flow structures. The present results have demonstrated the significant effects of the rib orientation on the film-cooling performance of gas turbine blades.

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CFD Analysis of Film Cooling

Cited by 18 publications

References 12 publications

Computational Predictions of Heat Transfer and Film-Cooling for a Turbine Blade With Non-Axisymmetric Endwall Contouring

Computational Predictions of Heat Transfer and Film-Cooling for a Turbine Blade With Non-Axisymmetric Endwall Contouring

Numerical Study on Flat Plate and Leading Edge Film Cooling

Numerical Simulation of Heat Transfer Coefficient and Film-Cooling Performance Influenced by the Orientation of Internal Turbulence Promoting Ribs

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