超声速后台阶流动/射流相互作用的数值模拟  

Numerical Simulation of Supersonic Flow/Jet Interaction at the Double Backward-Facing Step

作　　者：邓放 韩桂来[2,3] 孟宝清 丁珏 翁培奋[1] 韩鹏[4] 姜宗林[2,3] DENG Fang;HAN Gui-lai;MENG Bao-qing;DING Jue;WENG Pei-fen;HAN Peng;JIANG Zong-lin(Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;75837 Troops of the Chinese People's Liberation Army,Guangzhou 510000,China)

机构地区：[1]上海大学,上海市应用数学和力学研究所,上海200072 [2]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190 [3]中国科学院大学工程科学学院,北京100049 [4]中国人民解放军75837部队,广东广州510000

出　　处：《气体物理》2018年第6期41-50,共10页Physics of Gases

基　　金：国家自然科学基金(11472281,11532014);国家重点研发计划基金(2016YFA0401200)

摘　　要：采用高精度格式求解二维Navier-Stokes方程研究超声速射流与同向超声速后台阶流动相互作用的流场基本结构及规律,分别应用5阶WENO格式、6阶中心差分格式离散对流项和黏性项,时间推进采用3阶Runge-Kutta格式,并应用消息传递接口(message passing interface, MPI)非阻塞式通信实现并行化.分别研究了超声速后台阶流动、超声速射流的基本结构特征,以此讨论和分析超声速后台阶流动/射流相互作用的特征,以及不同来流条件对波系结构、涡结构、剪切层、膨胀扇等的影响,尤其是来流剪切层和射流剪切层的相互作用,形成复杂的波系结构及相互干扰的流动现象.In order to study the interaction between jet and supersonic flow,high accurate scheme was adopted to solve 2D Navier-Stokes equations studying the basic structure and law of interactions between jet and supersonic flow.The 5^th order WENO scheme and the 6^th order central difference scheme were used to discretize the convection term and viscous term respectively.Furthermore,the time marching scheme was adopted in the 3^rd order Runge-Kutta scheme,and the parallel computation was performed by using MPI non-blocking communication.Double backwards-facing step was presented in this paper.Supersonic flow(no jet),basic structure of jet and supersonic flow/jet interaction under different pressure ratios were studied respectively.It is found that jet structures with height above 20 km are highly under expanded jet.The interaction between supersonic slow and jet has obvious heating the wall of steps,which is about 400 K higher than that of the only flow.The complicated supersonic flow/jet interaction makes the flow field instability in advance,which forms the complex wave structure,shock wave/Kelvin-Helmholtz vortex interaction and other flow physics phenomenons.

关 键 词：超声速 两步后台阶 射流 剪切层 数值模拟 

分 类 号：O354.4[理学—流体力学]