机翼湍流尾流Tr-PIV测量分析  

Measurement and analysis of turbulent flow behind airfoil by Tr-PIV

作　　者：翟树成[1] 张军[1] 洪方文[1] 赵峰[1] 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《舰船科学技术》2011年第2期18-23,共6页Ship Science and Technology

摘　　要：采用Tr-PIV(Time-resolved Particle Image Velocimetry)技术对机翼湍流尾流场的非定常现象进行了测量分析。试验获得了流场瞬时速度场的基本结构演化、流场的湍流强度分布、涡量场、雷诺应力场以及湍流空间相关系数;通过功率谱分析对速度场进行了相位分解,获取了相位平均下的湍流积分尺度。基于泰勒冻结假设及采用"以时代空"的方法获得了湍流时间积分尺度,同时直接采用速度场空间相关方法获得湍流空间积分尺度,并对二者作了比较分析,讨论了该假设的适用性。The measurement and analysis of unsteady flow field behind a airfoil is done by TR-PIV. The based structure of instant flow field is presented and the turblence intensity, reynolds stress field and turbulent correlation coefficient for turbulent field were also acquired. A phase averaged decomposition of the velocity field by the analysis of auto-power spectrum was utilized to calculate the phase averaged turbulent length scale. Comparing the turbulent correlation length scale applying the Taylor hypothesis and two-point velocity spatial correlation shows the applicability of this hypothesis.

关 键 词：Tr-PIV 机翼 湍流流场 相关分析 

分 类 号：O35[理学—流体力学]