旋转方截面U型通道分离流二阶相关分量测量  

Double correlations measurement of turbulent separated flow through rotating square U bend duct

作　　者：吉洪湖[1] Launder BE Jackson DC 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016 [2]Mechanical Engineering Dept.,UMIST

出　　处：《推进技术》2001年第4期299-302,共4页Journal of Propulsion Technology

摘　　要：为了深入了解旋转涡轮叶片内冷通道中的紊流特性 ,并为CFD研究提供实验数据 ,用激光多普勒测速仪 (LDA)测量了旋转U型通道中分离流的雷诺应力分量。通道的转轴与弯道的曲率轴平行 ,测量是在与转轴垂直的对称平面中进行的 ,流动状态为Re=10 0 ,0 0 0 ,Ro =0 ,0 2和 - 0 2。直接测量的分量为u2 x,u2 z和uxuz,结果表明旋转对紊流分布的形式有很强的影响。在测量的三种旋转状态中Ro =0 2的正转和Ro =0 2的负转分别具有最低和最高的紊流强度。根据测量到的信息估算了雷诺应力uiuj的产生率 。The LDA measurement results of double correlation of the separated flow in a U-bend duct rotating around a axis parallel with the bend axis is discussed. The measurement is made in the symmetric plane perpendicular to the rotating axis with Re=100000, and Ro=0, 0.2, or-0.2 respectively. The components of double correlation directly measured are the average of ux2, ux2 and UxUx, the results show that rotation has strong influence on the turbulence distribution pattern. Among the three rotating cases. positive rotation with Ro=0.2 has the lowest, and negative rotation has the strongest turbulence intensity. Based on the measured information the generation rate of Reynolds stress the average of uiuj is estimated, the results show that negative rotation has higher generation rate than positive rotation.

关 键 词：旋转涡轮叶片内冷通道 紊流特性 旋转方截面U型通道 分离流 二阶相关分量 雷诺应力分量 旋转状态 流场显示 平均速度 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]