不同飞行高度下超声速来流/射流及其相互作用的数值模拟

doi:10.12066/j.issn.1007-2861.2147

摘要/Abstract

摘要：

采用高精度格式求解二维Navier-Stokes方程, 研究了不同飞行高度下超声速来流和射流在后台阶相互作用的流场基本结构. 时间推进采用三阶精度Runge-Kutta格式, 分别应用五阶精度加权本质无振荡(weighted essentially non-oscillatory, WENO)格式、六阶精度中心差分格式来离散对流项和粘性项, 并应用MPI非阻塞式实现并行化. 采用两步后台阶模型分别研究了不同高度下超声速后台阶流动、射流的基本结构特征; 并进一步组合两种流动, 研究了超声速来流/射流组合流动下相互作用的流场结构. 通过改变后台阶上方来流条件, 模拟了不同飞行高度的环境, 研究了其对流场中涡、剪切层、激波等结构的影响. 研究结果发现, 超声速来流和射流发生相互作用后, 在后台阶附近产生回流区, 超声速来流的存在会对射流的流场结构产生影响.

关键词: 后台阶, 射流, 剪切层, 数值模拟

Abstract:

The two-dimensional Navier-Stokes equations were solved using high-precision schemes, and the basic structure of the flow field in the supersonic flow and jet flow at different flight altitudes was studied. The three-order Runge-Kutta scheme was adopted in the time-marching scheme. The five-order weighted essentially non-oscillatory (WENO) and the six-order central difference schemes were used to discretize the convection term and viscous term, respectively. The parallel computation was performed using MPI non-blocking communication. The basic structural characteristics of backward-facing step flow and jet flow under backward-facing steps at different flight altitudes were studied. Furthermore, by combining the two flows, the flow field structure of the interaction between the supersonic flow and jet flow was studied. The supersonic flow above the backward-facing step was changed to simulate the environment of different flight altitudes, and the environment affected structures such as vortices, shear layers, and shock waves in the flow field. It was observed that after the interaction between the supersonic flow and jet flow, a recirculation zone was generated near the back step, and the presence of supersonic flow affected the structures of the jet flow.

Key words: backward-facing step, jet flow, shear layer, numerical simulation

中图分类号:

O354

邓放, 韩桂来, 刘美宽, 丁珏, 翁培奋, 姜宗林. 不同飞行高度下超声速来流/射流及其相互作用的数值模拟[J]. 上海大学学报(自然科学版), 2021, 27(2): 307-324.

DENG Fang, HAN Guilai, LIU Meikuan, DING Jue, WENG Peifen, JIANG Zonglin. Numerical simulation of the supersonic flow/jet flow and their interaction at different flight altitudes[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(2): 307-324.

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