平板间湍流流动影响因素的研究  

Influence Factor of Turbulence Between the Walls

作　　者：赵君[1] 

机构地区：[1]核工业理化工程研究院,天津300180

出　　处：《东华理工大学学报（自然科学版）》2013年第S2期105-108,共4页Journal of East China University of Technology(Natural Science)

摘　　要：流动状态变化直接影响着设备的功耗和性能,为了研究湍流流动状态的产生和变化情况,以优化设备性能。采用蒙特卡洛直接模拟方法计算了Knudsen数以及平板间距离变化时,平板间流体湍流流动变化。采用变径软球模型计算模拟分子之间的双体碰撞,计算分子与壁面之间的相互作用时,引入比例系数对镜面反射、漫反射后速度进行比例合成,计算反射后速度。计算了Knudsen数、平板间距离不同情况下平板间流体雷诺应力、湍流度等的变化情况,分析了平板间流体湍流脉动的变化。The flow state affects the power loss and performance of the equipment. To study the character of the turbulence and optimize the performance of the equipment,DSMC is used to calculate the turbulence between two walls when Knudsen number and distance changed. VSS is used to calculate simulate molecule collision. The synthesis of speed of mirror reflection and diffuse reflection have both been taken into account when calculate reflection velocity. Fluctuating velocity,reynolds stress and turbulence intensity have been calculated,and the influence of Knudsen number and distance are analysed.

关 键 词：湍流 变径硬球模型 雷诺应力 

分 类 号：O357.5[理学—流体力学]