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.
出处
《力学学报》
EI
CSCD
北大核心
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.
