磁流体湍流及数值模拟研究综述

自从20世纪90年代初,AJAX计划的提出掀起了磁流体技术的研究热潮.本文总结了国内外关于磁流体湍流研究的成果,包括两方面:磁流体湍流的特点和数值模型.相比于普通湍流,磁流体湍流表现出电磁诱导的各向异性、线性焦耳耗散、湍流重层流化等特性,本文同时对磁流体湍流的结构和脉动抑制现象进行了描述:数值模型研究从雷诺平均方程和大涡模拟两方面作了介绍.当前研究集中在不可压缩磁流体湍流,距离能够应用于航空航天问题还有很长的路要走.

REVIEW OF THE MAGNETOHYDRODYNAMIC TURBULENCE AND ITS NUMERICAL SIMULATION

The magnetohydrodynamic technology becomes a research hotspot since the "AJAX" concept was proposed by Russia in the early 1990s. This paper reviews the advances of the studies of magenetohydrodynamic turbulence, mainly in two parts: the characteristics of magenetohydrodynamic turbulence and the numerical models of magenetohydrodynamic turbulence. Magnetohydrodynamic turbulence has some peculiar characteristics such as the anisotropy induced by the magnetic field, the Joule dissipation, the relaminarization of turbulence, which are different from common turbulence. This paper also discusses the effects of the magnetic field on the turbulence structures and the turbulence intensities. Two methods of numerical simulations are addressed for engineering applications: the Reynolds average Navier-Stokes equations and the large eddy simulation. Almost all studies are conducted for incompressible fluid, and it is not the case for aerospace applications since most of air vehicles operate in a medium of high Mach number, that is compressible.