旋转对平板通道内湍流流动和换热影响的直接模拟  

Direct Numerical Simulation of Spanwise Rotating Channel Flow and Heat Transfer

作　　者：李光熙[1] 陶文铨[1] 李增耀[1] 宇波[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2005年第5期441-444,共4页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展规划资助项目(G2000026303);国家自然科学基金资助项目(50476046)

摘　　要：直接模拟了展向旋转数等于0～15时平板通道内的湍流流动和换热,分析了科氏力对湍流平均特性、湍流统计特性、雷诺应力输运和湍流结构的影响.采用有限差分法离散非稳态N-S方程,湍流雷诺数和普朗特数分别为150和0.71,网格数为64×128×64.计算结果表明,随着旋转数的增加,压力面附近湍流强度增大,换热增强,而吸力面附近换热减小.雷诺应力输运方程中的旋转项在各应力中的能量分配作用远大于压力分配项,且旋转项使得雷诺应力输运方程的各项分布和相对关系发生了较大的变化.由于科氏力的作用,压力面附近的条带间距减小,条带变细、变短,而吸力面流动脉动衰减,有层流化的趋势.The effects of spanwise rotation on the turbulent channel flow and heat transfer were examined with direct numerical simulation (DNS). The unsteady N-S equations were discretized by finite difference method. The Reynolds number based on half channel width and friction velocity and the Prandtl number were set to be 150 and 0.71, respectively. Grid number was 64 × 128 × 64. Our computational results indicate that the turbulent intensity increased and heat transfer is enhanced at the pressure side with increasing rotation number, while heat transfer is suppressed at the suction side. Moreover, the rotation terms in the Reynolds stress transport equations play more important role in the redistribution of energy among different direction than the pressure-redistribution terms, and they change drastically the budget of Reynolds stress equations. In addition, in the pressure side, the effect of Coriolis force makes the low-speed streaks slenderer and the space between streaks smaller, and in the suction side, streaks almost disappear and the flow has the tendency to become laminar.

关 键 词：湍流 直接模拟 旋转 

分 类 号：TK124[动力工程及工程热物理—工程热物理] O357.5[动力工程及工程热物理—热能工程]