六线涡量探针的测量原理与应用  

THE PRINCIPLE AND APPLICATION OF A SIX-SENSOR HOT-WIRE PROBE FOR VORTICITY MEASUREMENT

作　　者：魏中磊[1] 魏庆鼎[1] 王凯建[1] 林发布[1] 尹崇禄[1] 翟建军[1] 

机构地区：[1]北京大学湍流与复杂系统研究国家重点实验室,北京100871

出　　处：《力学学报》2002年第5期666-674,共9页Chinese Journal of Theoretical and Applied Mechanics

基　　金：科技部攀登项目<流体及空气动力学基础问题研究>资助课题.

摘　　要：介绍六线涡量探针和六通道热线风速仪的研制成果,应用该探针可同时测量两个涡量分量ωχ和ωy（或ωx和ωz）,以及3个速度分量μυω等相应的瞬时脉动值和统计平均值,从而可进一步测量湍流场内的湍能和雷诺应力,以及螺度和涡拟能等参量.还报道了应用该六线涡量探针,测量二维混合层内各湍流参量以及涡量分量ωχ,ωyωz统计平均值的分布结果,并与前人的结果作了比较.The principle and application of a six-sensor hot-wire probe for measuring the vorticity in the flow field was introduced in the present paper. The structure of this six-sensor vorticity probe consists of 3 x-array in the zx-plane and a single x-array in the xy-plane, whose distance between the wires in zx-plane is 1 mm, and 2 mm in the xy-plane. This six-sensor hot-wire vorticity probe can measure streamwise and spanwise vorticity ω_x,ω_z, or streamwise and transverse vorticity ω_x,ω_y, as well as three instantaneous velocity components u,v and w simultaneously. The probe can provide a good spatial resolution in the measurement of spatially averaged vorticity over a small domain of 2 mm X 2 mm, which is small enough to compare with λ_f and λ_g Taylor scale in the free turbulence flow. The experimental results of the growth rate of momentum thickness θ_s along the streamwise direction, the distribution of turbulence energy, Reynolds stress u'v' and vorticity ω_x,ω_y, etc. along transverse direction in a two-dimensional mixing layer at SKLTR of Peking University are presented, which are in good agreement with other authors' published results.

关 键 词：六线涡量探针 测量原理 热线风速仪 二维混合层 湍流场 雷诺应力 

分 类 号：TH815[机械工程—仪器科学与技术] O357.5[机械工程—精密仪器及机械]