【摘要】 针对大尺寸低压涡轮导叶利用现有冷效试验设备扇形试验段内仅能布置3个叶片、叶栅通道流动周期性无法保证的问题,采用CFD方法分析了周期性无法保证的主要原因,为试验件排气测量段导流板引起测试叶片吸力面激波干涉和流动分离。对比研究4种导流板优化方案发现,采用截断导流板的方案可以消除测试叶片激波干涉,改善扇形叶栅通道流动周期性,使叶片表面流动状态接近理论设计。采用气热耦合计算的叶片壁面温度分布与试验结果吻合良好,验证了优化设计的有效性,为类似大尺寸涡轮叶片扇形叶栅及冷效试验件的设计提供了一种优化思路。更多还原

【Abstract】 For the investigated large-size low-pressure turbine guide vanes, only three blades can be arranged in the fan-shaped test section by using the existing cooling efficiency test equipment. As a result,the flow field periodic condition cannot be guaranteed in the sector cascade. The main cause of flow field periodic failure was shock wave interference and flow separation on the suction side of the test blade caused by the guide plate of the exhaust measurement section of the sector cascade. Through the comparative study of four optimization schemes of the guide plate, it was found that removing the guide plate could eliminate the shock wave interference, the periodicity of the blade can be improved, and the flow state of the blades was similar to the design condition. The results of cooling efficiency test are in good agreement with the values of conjugate heat transfer(CHT) numerical simulation, which verifies the validity of the method and provides an optimization method for the design of turbine blade sector cascade and cooling efficiency test.更多还原