微型燃气轮机向心透平内部流动分析  

Flow Characteristics of the Radial Inflow Turbine Rotor of a Micro Gas Turbine

作　　者：康婷[1,2] 李雪松[1] 顾春伟[1] 

机构地区：[1]清华大学热能工程系.热科学与动力工程教育部重点实验室,北京100084 [2]中国一航沈阳发动机设计研究所,沈阳110015

出　　处：《热力透平》2009年第2期78-81,147,共5页Thermal Turbine

摘　　要：对某2.6kW微型燃气轮机向心透平叶轮进行了全三维粘性数值模拟。分析了设计工况下通道中的二次流动现象、各个涡系的发展以及不同叶尖间隙对流动的影响。结果表明:通道内吸力面侧二次流动明显,由于通道涡、泄漏涡的共同作用,叶轮的损失主要集中于吸力面侧靠近叶顶区域;叶轮顶部间隙增加,透平叶轮通流能力下降较慢,而效率降低较快。由于刮削流的影响,使得径向间隙变化对透平效率和质量流量的影响要比轴向间隙更明显。The flow characteristics of the radial inflow turbine rotor of the micro gas turbine were analyzed by the 3-D viscous code. The flow behavior at the designing point was analyzed. Results show that secondary flow closed to the suction surface is one of the main reasons of the loss due to the combined action of flow path vortex and leaking vortex . Morever, flux decreases slowly and efficiency decreases lastly when the tip clearance becomes wide. Results also show that the radial tip clearance has more effect on the stage efficiency than the axial tip clearance.

关 键 词：微型燃气轮机 向心透平 二次流 叶顶间隙 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]