Detached Eddy Simulation of Turbine Blade Cooling

Kapadia, Sagar; Roy, Subrata; Heidmann, James D.

doi:10.2514/6.2003-3632

Cited by 19 publications

(24 citation statements)

References 27 publications

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“…A hybrid method between RANS and LES, Detached Eddy Simulation (DES), gives a compromised solution, which is expected to give better results than RANS with less computational cost compared with LES and DNS. Kapadia et al (2003) have used DES to compute the film cooling effectiveness on a flat plate, showing a good agreement with the experiment data with an affordable computational effort. Thus, DES is also performed in this study for validation purpose.…”

Section: Methodsmentioning

confidence: 87%

Numerical Simulations of Imperfect Bifurcation of Jet in Crossflow

Wang

Liang

et al. 2012

Engineering Applications of Computational Fluid Mechanics

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This paper investigates the flow structure nearby a rectangular cooling hole on a flat plate by numerical simulations and topological analysis. The velocity ratio ranges from 0.5 to 1.5. Steady Reynolds-averaged NavierStokes simulations and unsteady detached eddy simulations are performed based on the Spalart-Allmaras turbulence model. The time-averaged velocity profiles in the central plane are verified by grid convergence study and comparison with the experimental data. The discussions mainly focus on the effect of the velocity ratio on the vortex structure and the stability of the jet-in-crossflow (JICF) system. The simulation results show that a bifurcation of the vortex system exists with respect to the velocity ratio. The averaged flow goes from a symmetric structure to an asymmetric structure on this bifurcation. The detached eddy simulation results show that both the symmetric vortex system and the asymmetric vortex system with different velocity ratios are stable.

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Section: Methodsmentioning

confidence: 87%

Numerical Simulations of Imperfect Bifurcation of Jet in Crossflow

Wang

Liang

et al. 2012

Engineering Applications of Computational Fluid Mechanics

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“…The configurations of the base and the ramp models follow the studies of Kapadia et al [5] and Jiang et al [6]. The shaped diffuser model is a variant of that used by Dhungel [7] and the console slot model adopts the settings as seen in reference [8].…”

Section: Problem Descriptionmentioning

confidence: 99%

“…While the leading edge line of the cooling hole remains unchanged, the trailing-edge line deflected at an angle of 17. 5 after a distance of about 3D from hole inlet and on the bottom wall surface of the mainstream domain (i.e. y/D ¼ 0), the lateral expansion angle between two opposite hole edge lines is y ¼ 40 .…”

Section: Geometry Definitionmentioning

confidence: 99%

“…The study starts with a comprehensive analysis using a base cylindrical model, previously studied by other researchers [5] and validated against available numerical predictions and experimental measurement. Using this model as a baseline, further three hole geometries are considered as a cylindrical hole with an upstream wedge geometry (named 'ramp' thereafter) [6], a shaped diffuser hole geometry [7], and a double console slot geometry [8].…”

Section: 222mentioning

confidence: 99%

“…Film-cooling effectiveness has been studied by using a computational approach Film-cooling effectiveness has been studied by using a computational approach [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] {SAGE}PIA/PIA 399013.3d (PIA) [PREPRINTER stage] several rows across the spanwise direction at locations where the blade surface is largely exposed to a high-temperature gas stream. Typical locations include blade leading edge area (for leading-edge impinging cooling), mid-blade surface region (for blade film cooling) and blade trailing edge area (for trailing-edge injection cooling).…”

Section: 222mentioning

confidence: 99%

See 2 more Smart Citations

Computational study of hole shape effect on film cooling performance

Yao

2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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Film-cooling effectiveness has been studied by using a computational approach based on solving the Reynolds-averaged Navier-Stokes equations. A wind tunnel test configuration is considered with a total of four cooling hole geometries as a cylindrical hole, a cylindrical hole with an upstream wedge (called 'ramp' thereafter), a shaped diffuser, and a double console slot. In all cases, the hole centre-line has an inclination angle of 35 against the mainstream airflow and the blowing ratio is unity. Choosing the cylindrical model as a baseline, simulations have been carried out for grid convergence and turbulence model influence studies. Results are compared with available experimental data and other numerical predictions and good agreement has been achieved. Further computations continue with three remaining geometries, using the baseline flow conditions and configuration. Comparing to the results from the baseline model, it was found that the centre-line adiabatic cooling effectiveness has shown incremental increases for the 'ramp' model, while results from the console slot model and the shape diffuser model have exhibited significant improvements by a factor by 1.5 and 2, respectively. The reason for such a step change in cooling effectiveness is mainly due to the weakening of the vortex structures in the vicinity of the hole exit, thus significantly reducing the entrainment of surrounding 'hot' fluids.

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Correlation and Spectra Analysis for Jet in Cross Flow Based on DES Results

Liang

Kang

2012

Progress in Hybrid RANS-LES Modelling

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Detached Eddy Simulation of Turbine Blade Cooling

Cited by 19 publications

References 27 publications

Numerical Simulations of Imperfect Bifurcation of Jet in Crossflow

Numerical Simulations of Imperfect Bifurcation of Jet in Crossflow

Computational study of hole shape effect on film cooling performance

Correlation and Spectra Analysis for Jet in Cross Flow Based on DES Results

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