某小型涡轮不同篦齿封严结构性能分析  

Performance Analysis of A Small Turbine with Different Shroud Seal

作　　者：石书成 董学智[1,2] 刘锡阳[1,2] 高庆[1,2] 陈海生[1,2] 谭春青[1,2] 

机构地区：[1]中国科学院大学,北京100190 [2]中国科学院工程热物理研究所,北京100190

出　　处：《燃气轮机技术》2015年第1期24-28,34,共6页Gas Turbine Technology

摘　　要：通过对某小型涡轮叶顶间隙内的泄漏流动进行数值模拟,分析了不同篦齿形状、高度下叶顶间隙内气流流动特性。结果表明:叶顶泄漏流主要存在于叶片中后部;在保证间隙不变的条件下,梯形篦齿可有效降低泄漏流动;减小篦齿封严间隙可以在一定程度上提高涡轮效率。Based on a numerical simulation of the tip leakage of a small turbine,this paper analyses the flow characteristics in tip clearance under different shape and height of the shroud seal. The results show that the tip leakage flow mainly exists in the middle and rear area of the blade. While keeping the tip clearance unchanged,small turbine with trapezoidal shroud seal performs the best efficiency.The efficiency of the small turbine can also be improved by reducing the height of the shroud seal.

关 键 词：叶顶间隙 封严篦齿 小型涡轮 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]