Sensitivity Analysis of the Film-Cooling Effectiveness of an Upstream Crescent-Shaped Vortex Generator to Geometric Parameters

Zhang, C.; Bai, Linchao; Zhang, P. F.

doi:10.1007/s10891-021-02394-7

Cited by 1 publication

(4 citation statements)

References 26 publications

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“…The continuity equation discretization uses the Rhie-Chow scheme. The numerical works [20][21][22]29] for cylindrical holes with or without the crescentshaped block in flat-plate conditions have already shown that the predicted results of laterally averaged cooling effectiveness agree well with the experimental data in [19]. The predicted total pressure loss coefficient profile along the spanwise direction at M = 2.2 is further provided in this study compared with the experimental data in [30], demonstrated in Figure 7.…”

Section: Computational Mesh and Numerical Methodssupporting

confidence: 70%

“…Recently, Zhang et al [22] optimized the crescent-shaped block by genetic algorithm. The area-averaged cooling effectiveness could be improved by 127.8% and 16.6% at blowing ratios of M = 0.5 and 1.5, respectively, compared with the reference model recommended by the Taguchi approach analysis result in [21]. Note that the above-mentioned research were all completed for the flat-plate film cooling.…”

Section: Introductionmentioning

confidence: 86%

“…Although the crescent-shaped block was originally put downstream of a cylindrical hole [20], it could still greatly raise the cooling effectiveness. Zhang et al [21] conducted a sensitivity analysis on the geometrical parameters of the crescent-shaped block. They found that the height has the biggest impact on the area-averaged cooling effectiveness.…”

Section: Introductionmentioning

confidence: 99%

“…The flow and cooling performance of two crescent-shaped block models in low-speed linear cascade was also investigated. These two blocks are acquired from our previous optimization work [21] under the flat plate condition with two blowing ratios of 0.5 and 1.5.…”

Section: Introductionmentioning

confidence: 99%

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Film Cooling Performance of a Cylindrical Hole with an Upstream Crescent-Shaped Block in Linear Cascade

et al. 2023

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Recent works have already demonstrated that placing a crescent-shaped block upstream of a cylindrical hole could enhance the cooling performance of flat-plate films. The flow and cooling performance of the crescent-shaped block applied over the pressure and suction sides of the blade is investigated in this article. The Reynolds-averaged Navier-Stokes equations are solved with the Shear Stress Transport model for turbulence closure. Two optimized blocks are obtained from the flat-plate film cooling in our previous work, and two positions on the pressure and suction sides are tested. The blowing ratio varies from 0.5 to 2.0. The results show that when the block is applied on the blade surface, it yields a different cooling performance compared with the flat plate due to different geometry curvature and pressure gradient. The cooling performance on the suction side is slightly higher than on that on the pressure side, while the aerodynamic loss on the suction side is much higher. For the different blocks, the qualitative change of cooling performance vs. blowing ratios held on turbine blades is quite close to that of flat plates. The optimized smaller block in the flat plate provides better cooling performance at lower blowing ratios, while the larger block is superior when the blowing ratios are higher.

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