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

作　　者：贺铸[1] 柳朝晖[1] 刘亚明[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2005年第3期459-461,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划项目资助(No.G1999022207)国家自然科学基金资助项目(No.50006003;No.50276021)

摘　　要：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.

关 键 词：直接数值模拟 非等温气固两相湍流 温度统计 

分 类 号：TK16[动力工程及工程热物理—热能工程]