湍流涡黏性模型方程中相位差的测量

Measurement of phase difference for eddy viscosity model equation of turbulence

基于理论上湍流相干结构复涡黏性模型对涡黏性系数的分析,应用热线测速技术测量了平板湍流边界层多尺度相干结构动力学方程中非相干结构成分对相干结构贡献的雷诺应力分量与相干结构流向速度流向变形率之间的相位差。分析了湍流边界层相干结构猝发过程中,非相干结构成分对相干结构贡献的雷诺应力分量与相干结构流向速度流向变形率之间的相位差沿湍流边界层法向的变化规律,为建立更加符合实际的湍流模型提供了实验依据。

Based on the analysis of eddy viscosity coefficient of turbulent coherent structures complex eddy viscosity model in theory, the measurement technique of constant temperature anemometry has been used to measure the phase difference between Reynolds stress component that noncoherent structures component contribute to coherent structures and longitudinal velocity strain rate of longitudinal velocity of coherent structures in the dynamic model equation of multi- scale coherent structures in turbulent boundary layer over smooth surface. The variational law of phase difference in the course of coherent structures bursting along normal direction in turbulent boundary layer has been analysed,which offers experimental evidences for constituting more actual turbulent model.