轮缘间隙出流对下游动叶端壁气膜冷却特性的影响  

Effects of Rim Seal Purge Flow on Film Cooling Characteristics of Downstream Rotor Endwall

作　　者：高庆 屈杰[1] 王汀[1] 马汀山[1] 居文平[1] 李军[2] GAO Qing;QU Jie;WANG Ting;MA Tingshan;JU Wenping;LI Jun(Xian Thermal Power Research Institute Co.,Ltd.,Xian 710054,China;School of Energy and Power Engineering,Xian Jiaotong University,Xian 710049,China)

机构地区：[1]西安热工研究院有限公司,西安710054 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《动力工程学报》2021年第5期374-379,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51776151)。

摘　　要：对轮缘间隙出流与主流相互作用下的动叶端壁气膜冷却特性进行了研究,通过数值求解三维RANS方程组和SST湍流模型,详细分析了冷却气流质量流量比MR和进气预旋度等气动参数对动叶端壁气膜冷却特性的影响规律。结果表明:增大MR有利于提高动叶前缘端壁区域的气膜冷却效率,但即使在较大MR工况下,动叶中后弦长端壁区域仍无法获得充足的气膜保护;随着进气预旋度的增大,气膜覆盖面积和平均气膜冷却效率均有所提高;通过调整进气预旋度使冷却气流以设计气流攻角进入动叶通道时,动叶端壁将获得最佳的气膜冷却特性。The film cooling characteristics of the rotor endwall under the interaction of the rim seal purge flow and the main flow were studied. By solving the three-dimensional RANS equations and SST Turbulence model, the effects of aerodynamic parameters such as coolant mass flow ratio(MR) and purge flow swirl ratio on film cooling characteristics of rotor endwall were analyzed in detail. Results show that increasing MR is beneficial to improve the film cooling efficiency at the endwall region in the leading edge of the rotor blade, but even under the condition of large MR, the middle-rear part of rotor hub platform still can not get enough film protection. By adjusting the purge flow swirl ratio to make the cooling airflow enter the rotor blade passage at the designed angle of attack, the optimal film cooling characteristics of rotor endwall can be obtained.

关 键 词：轮缘密封 动叶端壁 冷却特性 数值模拟 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]