气泡-液体闭式多股射流的大涡模拟研究  

LARGE-EDDY SIMULATION OF BUBBLE-LIQUID CONFINED JETS

作　　者：杨玟[1] 周力行[1] 李荣先[1] L.S.Fan 

机构地区：[1]清华大学工程力学系,北京100084 [2]Department of Chemical Engineering,The Ohio State University,Columbus,USA

出　　处：《工程热物理学报》2003年第1期127-130,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.19872039)

摘　　要：采用气泡-液体两相流动的欧拉-拉氏大涡模拟,研究了矩形通道内多股射流形成的气泡-液体两相湍流流动,得到了气液两相湍流瞬态结构,产生和发展过程。研究结果发现气泡和液体都有瞬态大涡结构,气泡脉动比液体的强。大涡模拟统计结果给出了有无气泡两种情况下的液体湍流脉动速度均方根值分布。瞬态和统计结果都表明,气泡增大了液体湍流,液体湍流来源于其自身的剪切产生和气泡的作用。这与二阶矩模型模拟结果定性一致。The Large-eddy simulation (LES) with two-way coupling is used to study bubble-liquid two-phase confined multiple jets discharged into a 2-D channel. The LES results reveal the large-eddy vortex structures of both liquid flow and bubble motion, the shear-generated and bubble-induced liquid turbulence, and indicate much stronger bubble fluctuation than those of the liquid, the enhancement of liquid turbulence by bubbles. Both shear production and the production due to bubble-liquid interaction are important for the liquid turbulence generation in the case studied. The LES statistical results are in qualitative agreement with the SOM simulation results.

关 键 词：气泡-液体闭式多股射流 气液两相射流 两相湍流 大涡模拟 

分 类 号：O359.1[理学—流体力学]