较低电场的湍流边界层分离MHD控制研究

doi:10.7527/S1000-6893.2025.32481

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较低电场的湍流边界层分离MHD控制研究

丁明松¹,许勇¹,江涛¹,刘庆宗²,李鹏¹

1. 中国空气动力研究与发展中心
2. 中国空气动力研究与发展中心计算所

收稿日期:2025-06-27 修回日期:2025-09-03 出版日期:2025-09-05 发布日期:2025-09-05
通讯作者: 许勇
基金资助:
国家数值风洞工程

MHD Control of Turbulent Boundary Layer Separation with Low Electric Field

Received:2025-06-27 Revised:2025-09-03 Online:2025-09-05 Published:2025-09-05
Supported by:
National Numerical Windtunnel

摘要/Abstract

摘要： 边界层分离MHD控制较高的外加电场强度和电磁能量需求是工程实用化的难点之一。通过耦合求解含电磁源项的流动控制方程、电势泊松方程、磁矢量积分方程和考虑电磁耗散的湍流方程，建立了考虑多种物理效应的高速流动湍流与电磁场耦合计算方法，较为系统地开展了较低外加电场条件下进气道湍流边界层分离的局部电磁流动控制研究，重点分析了洛伦兹力、电流焦耳热作用对分离流动的影响机制，得到了不同外加磁场、外加电场和气体电导率条件的MHD控制规律和电磁能量变化特征，可为MHD控制方案设计提供参考。研究表明：①在本文较低外加电场条件下，局部MHD控制可以实现进气道湍流边界层分离的有效抑制，使分离区面积减小约85%。②洛伦兹力主导了局部MHD控制，焦耳热耗散削弱了电磁控制效果，湍流脉动电磁耗散的影响较小，几乎可以忽略。③外加磁场、气体电导率或外加电场对电磁能量的影响特征存在显著差异，在满足工程约束和MHD控制效果的前提下，建议适当选用外磁场相对较大、电导率相对较高、外加电场相对较低的方案。

关键词: 磁流体力学, 边界层分离, 湍流, 电磁耗散, 数值模拟

Abstract: Boundary layer separation MHD control of high applied electric field and electromagnetic energy requirements is one of the difficulties in practical engineering. A coupled computational method of hypersonic turbulence and electromagnetic field considering various physical effects is established by solving the governing equations of flow with electromagnetic source term Poisson equation of electric potential integral equation of magnetic vector and turbulence equation considering electromagnetic dissipation. The local electromagnetic flow control of turbulent boundary layer separation in typical inlet under low applied electric field is systematically studied. The influence mechanism of Lorentz force and current Joule heat on separated flow is emphatically analyzed, and the MHD control law and electromagnetic energy variation characteristics under different applied magnetic field, applied electric field and gas conductivity conditions are obtained. The results show that: At low applied electric field, local MHD control can effectively suppress turbulent boundary layer separation in the inlet, and the maximum separation area can be reduced by 85% under the calculation conditions in this paper. Lorentz force dominates local MHD control, while Joule heat dissipation weakens electromagnetic control effect; The influence of turbulent pulsation electromagnetic dissipation is small and can be almost ignored. The influence characteristics of applied magnetic field, gas conductivity or applied electric field on electromagnetic energy are significantly different. On the premise of satisfying engineering constraints and MHD control effect, it is suggested to choose the scheme with relatively large external magnetic field, relatively high conductivity and relatively low external electric field.

Key words: MHD, Boundary layer separation, Turbulence, Electromagnetic dissipation, Numerical simulation

中图分类号:

V411.3/O354.7

丁明松许勇江涛刘庆宗李鹏. 较低电场的湍流边界层分离MHD控制研究[J]. 航空学报, doi: 10.7527/S1000-6893.2025.32481.

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较低电场的湍流边界层分离MHD控制研究

MHD Control of Turbulent Boundary Layer Separation with Low Electric Field

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