摘要
对热声系统中交变流动的声场与流场分布进行了数值模拟,得到了热声谐振管和回热器(板叠)内的压力和速度分布及二者之间的相位关系。数值模拟表明:在谐振管内,在模拟的边界条件下,径向速度分布出现"环形效应",流动分为核心区的完全湍流流动和湍流边界层内的粘性流动;对于水力半径和粘性渗透层深度相当的热声板叠,其内速度分布逐步出现"环形效应",流动介于层流和湍流的过渡区,为过渡态流动,在流道的大部分区域压力和速度振荡的相位差趋向于π/2;对于水力半径和粘性渗透层深度之比较小的热声回热器,其内交变流动的流动特性与稳态流动的相似,速度的径向分布为抛物线形,类似于定常流动的层流速度分布。
Numerical simulation of the oscillating flow characteristics in thermoacoustic systems was performed. Results were obtained for three distinct configurations, involving resonator, stack and regenerator. In the first case, it was dominated by inertia and pressure gradient, an annular effect appeared in the flow field. The flow consisted of two layers ： the inviscid piston flow in the core and the frictional Stokes wall layer. It predicted transition flow in a stack whose hydraulic radius corresponds to viscous penetration depth. The phase difference between velocity and driving pressure trended to π/2 in the most region of channel. While in a generator whose hydraulic radius was much smaller than viscous penetration depth, the velocity distribution is parabolic,similar to a steady flow.
出处
《低温工程》
CAS
CSCD
北大核心
2008年第4期6-9,14,共5页
Cryogenics
基金
国家自然科学基金(90407012)
博士后科学研究基金(20070410645)资助
关键词
热声
交变流动
数值模拟
速度分布
thermoacoustic
oscillating flow
numerical simulation
velocity distribution
作者简介
孙生生，男，32岁，硕士研究生。
