非等温气固两相各向同性湍流的直接数值模拟

DIRECT NUMERICAL SIMULATION OF NON-ISOTHERMAL GAS-PARTICLE HOMOGENEOUS ISOTROPIC TURBULENCE

本文对非等温气固两相各向同性湍流中颗粒及颗粒所见流体温度的统计行为进行了直接数值模拟研究,系统地讨论了颗粒惯性的影响。对于Tp/Tk<1的颗粒,其温度脉动随惯性增大而减弱;对于Tp/Tk>1的颗粒,其趋势相反。颗粒及颗粒所见流体温度的自相关都随颗粒惯性的增加而减弱,而且随颗粒惯性的增加,颗粒所见流体温度的自相关比颗粒自身温度的自关联下降得快。

In this paper, direct numerical simulations were utilized to generate temperature field statistics in particle-laden incompressible stationary homogeneous isotropic turbulent flows. The effect of particle response time on the Lagrangian statistics of the particle and the fluid temperature seen by particles was examined. It shows that, for τp/τk less than or equal 1, the ratio of the fluid intensity seen by particle to fluid temperature intensities deceased as τp/τk increased; while for τp/τk>1, the trend is inversed. The Lagrangian autocorrelation coefficient of particle temperature RpT decreased as the particle inertia increases. The autocorrelations of the fluid temperature seen by particle have similar trends, whereas its autocorrelation coefficients decreased more rapidly as the particle inertia increased.