摘要
以某汽轮机高压级动叶为研究对象,采用κ-ωSST模型、SIMPLEC算法数值模拟了正弯扭叶片叶顶间隙泄漏涡的形成和发展过程及其对叶栅通道二次流的影响。结果表明:相对于常规扭叶片,汽流在正弯扭叶片吸力面附近形成的泄漏涡的影响范围和对通道主流的扰动变小,且叶顶间隙的增加削弱了正弯扭叶片吸力面的"C"型压力梯度,使得叶片两端部附面层厚度增加,造成了叶片端部损失的增大。
This paper reports a numerical study of the tip leakage votex development process and the interaction between the leakage flow and the endwall secondray flow in a positive curve-twisted blade of a high-pressure turbine stage. The K-tO SST turbulence model is adopted, and the SIMPLEC arithmetic is used. The results show that comparing to the conventional twis- ted blade ,the positive curve-twisted blade has smaller influence area of tip leakage votex and weaker disturbance to the main flow. The C-type pressure distribution which formed on the suction side of positive curve-twisted blade is weakened with increasing the the tip clearances, and the thickness of endwall boundary layer is strengthened, causing the endwall loss to increase.
出处
《汽轮机技术》
北大核心
2014年第4期258-260,共3页
Turbine Technology
基金
吉林省科技发展计划基金资助项目(20140204040SF)
关键词
正弯扭叶片
压力梯度
叶顶间隙
二次流
positive curve-twisted blade
pressure gradient
tip clearance
secondray flow
