Numerical Investigation of the Effect of Pulsed Injection on Film Cooling Effectiveness of Turbine Blade Under Rotation

Abadi, Seyyed Mehdi Hosseini Baghdad; Zirak, Saadat; Zargarabadi, Mehran Rajabi

doi:10.1615/heattransres.2021036404

Cited by 5 publications

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“…The SST k À ω model has been extensively used to successfully anticipate the fluid flow and the temperature of film covering and specially the pulsed flows. [17][18][19][20][21][22] The Shear Stress Transport model is a two-equation eddy viscosity model. It is a compounded of both k À ε and k À ω turbulence models, using the former in the mainstream and the latter near the surfaces.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…The maximum film effectiveness resulted at duty cycle of 0.14 and Strouhal number of 1.03. Hosseini Baghdad Abadi et al [16][17][18][19] investigated pulsed film cooling performance with square and sinusoidal wave pulsation at different blowing ratios and frequencies. Generally, the optimum film efficiency was obtained at higher frequencies in comparison with low frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pulse injection on film cooling performance: Experimental and numerical investigation

Abadi

Zirak

Zargarabad

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, the influence of pulsating air on film cooling of a flat plate at different frequencies and blowing ratios are experimentally and numerically investigated. Square wave pulsed flow is generated at four frequencies of 2, 10, 50, and 100 Hz corresponding to Strouhal numbers of 0.00254, 0.0127, 0.0636, and 0.1271, respectively, and at five blowing ratios of 0.5, 1, 1.5, 2.4, and 3. Reynolds-averaged Navier−Stokes equations are resolved to analyze the coolant film effectiveness based on parameters set in the experiments. The [Formula: see text] model used for turbulent modeling. The obtained results showed that the performance of pulsating cooling decreases with increasing of blowing ratio at the same flow as steady state conditions. The difference between numerical and experimental values for the centerline film effectiveness shows good adaptation at the distances of the injection hole downstream. The lift-off of the local jet increased under pulsation. Increasing the pulse frequency increases the overall efficiency of film cooling. The maximum mean centerline pulsating film cooling effectiveness is obtained at Strouhal number of 0.0636 and a blowing ratio of 0.5, and the minimum value is for Strouhal number of 0.00254 and a blowing ratio of 3. For pulsed flow, the maximum discrepancy of the mean centerline film effectiveness between experimental and numerical results was 17.82%.

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