间隙流动对涡轮叶片温度场分布影响的数值研究  

Numerical analysis of effect of clearance flow on distribution of temperature field in turbine blade

作　　者：李钰洁[1] 刘永葆[1] 高洁[2] 

机构地区：[1]海军工程大学动力工程学院 [2]91917部队

出　　处：《海军工程大学学报》2013年第6期24-29,共6页Journal of Naval University of Engineering

基　　金：国家自然科学基金创新研究群体科学研究基金资助项目(50721005)

摘　　要：对某型燃气轮机高压涡轮转子在不同叶顶间隙下采用圆柱坐标下的雷诺平均N-S方程和SST湍流模型进行数值计算。对比分析了不同叶顶间隙下间隙流的流场结构、间隙变化对叶片气动特性及温度分布产生的影响,揭示了间隙流动对叶片不同截面压力、温度场分布影响的规律。结果表明:随着间隙高度的增加,泄漏流在叶顶吸力面侧形成的泄漏涡的尺寸不断增大,尾缘区域混合流的流速增加,涡流的不规则运动降低;间隙增大导致叶片吸力面温度分布出现较大波动,其压力脉动最小值以及高温区均向尾缘方向移动。Average-Reynold N-S equation of cylindrical coordinate and SST onflow model are used to calculate the three dimensional flow in different clearances in a high pressure turbine rotor. The con- trast of clearance flow structures and the analysis of the effect of variations in clearance on aerodyna- mic characteristics and temperature distribution of the blade reveal the regularity of the clearance flow influencing the pressure and temperature field distribution of different blade cross-section. Studies show that with an increase in clearance height, the size of the leakage vortex formed by the leakage flow at the suction side becomes bigger,the velocity of mixed flow at the trailing edge becomes faster, and the anomalous movement of the vortex becomes lower. The increased clearance height leads to great fluctuations in the temperature distribution of the suction side, and the low pressure and high temperature area of the suction surface move towards the trailing edge.

关 键 词：涡轮转子 叶顶间隙 间隙涡 流场 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]