Effect of Non-Axisymmetric Endwall Profiling on Heat Transfer and Film Cooling Effectiveness of a Transonic Rotor Blade

IF 1.9 3区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Turbomachinery-Transactions of the Asme Pub Date : 2019-06-17 DOI:10.1115/gt2019-90154

Jinjin Li, Xin Yan, Kun He

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引用次数: 4

Abstract

Effects of non-axisymmetric endwall profiling on total pressure loss, heat transfer, and film cooling effectiveness of a transonic rotor blade were numerically investigated. The numerical methods, including the turbulence model and grid sensitivity, were validated with the existing experimental data. To reduce the thermal load on endwall, non-axisymmetric endwall profiling near leading edge and at pressure-side corner area was performed with a range of contour amplitudes. Heat transfer and flow fields near the profiled endwalls were analyzed and also compared with the plain endwall configuration. On the profiled endwall, three kinds of cooling holes, i.e., cylindrical holes, rounded-rectangular holes, and elliptical holes, were arranged, and film cooling effect was investigated at three blowing ratios. Results indicate that, with endwall profiling, the area-averaged Stanton number on endwall is reduced by 7.71% and total pressure loss in cascade is reduced by 11.07%. Among three kinds of cooling holes, the arrangement of the elliptical hole performs the best film cooling effect on the profiled endwall. Compared with the plain endwall, non-axisymmetric endwall with elliptical cooling holes improves film cooling coverage by 10.87%, reduces the Stanton number by 8.88%, and increases the net heat flux reduction performance by 4% at M = 0.7.

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非轴对称端壁型线对跨声速转子叶片传热及气膜冷却效果的影响

对非轴对称端壁型型对跨声速动叶总压损失、换热和气膜冷却效率的影响进行了数值研究。用已有的实验数据对湍流模型和网格灵敏度等数值方法进行了验证。为了减小端壁热负荷，在前缘附近和压力侧角区进行了非轴对称端壁轮廓，并在一定范围内进行了轮廓幅值的计算。分析了异形端壁附近的传热和流场，并与平面端壁结构进行了比较。在异形端壁上布置了圆柱孔、圆矩形孔和椭圆孔三种冷却孔，研究了三种吹气比下的气膜冷却效果。结果表明，采用端壁剖面后，端壁面积平均斯坦顿数减少7.71%，叶栅总压损失减少11.07%。在三种冷却孔中，椭圆孔的布置对异形端壁的气膜冷却效果最好。与平面端壁相比，带椭圆冷却孔的非轴对称端壁在M = 0.7时使气膜冷却覆盖率提高了10.87%，斯坦顿数降低了8.88%，净热流密度降低性能提高了4%。

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来源期刊

Journal of Turbomachinery-Transactions of the Asme 工程技术-工程：机械

CiteScore

4.70

自引率

11.80%

发文量

168

审稿时长

9 months

期刊介绍： The Journal of Turbomachinery publishes archival-quality, peer-reviewed technical papers that advance the state-of-the-art of turbomachinery technology related to gas turbine engines. The broad scope of the subject matter includes the fluid dynamics, heat transfer, and aeromechanics technology associated with the design, analysis, modeling, testing, and performance of turbomachinery. Emphasis is placed on gas-path technologies associated with axial compressors, centrifugal compressors, and turbines. Topics: Aerodynamic design, analysis, and test of compressor and turbine blading; Compressor stall, surge, and operability issues; Heat transfer phenomena and film cooling design, analysis, and testing in turbines; Aeromechanical instabilities; Computational fluid dynamics (CFD) applied to turbomachinery, boundary layer development, measurement techniques, and cavity and leaking flows.