高超声速湍流流动磁流体动力学控制机理  

Mechanism analysis of magnetohydrodynamic control in hypersonic turbulent flow

作　　者：罗仕超 吴里银 常雨[1] Luo Shi-Chao;Wu Li-Yin;Chang Yu(Hypervelocity Aerodymamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]中国空气动力研究与发展中心,超高速空气动力研究所,绵阳621000

出　　处：《物理学报》2022年第21期213-222,共10页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2019YFA0405203,2019YFA0405200)资助的课题。

摘　　要：基于低磁雷诺数假设建立完全气体湍流流场、磁场耦合模型.数值计算方法上,通过AUSMPW+格式和LUSGS隐式处理方法求解磁流体动力学湍流流动方程,其中湍流模型采用Spalart-Allmaras模型.分析了不同外加磁场条件下平板及压缩拐角湍流边界层流动控制效果.研究表明:湍流边界层磁流体动力学流动控制效果与洛伦兹力大小正相关;外加磁场作用下,洛伦兹力的方向和流动方向相反,此时洛伦兹力起到减速的作用,减少了近壁面流体的动量,降低了边界层抵抗分离的能力;逆流向洛伦兹力减小了壁面的剪切应力,从而降低湍流流场壁面摩擦阻力系数,洛伦兹力对流体做负功,边界层内温度增加;磁相互作用位置对磁流体动力学分离区控制效果存在较大影响,工程应用中需配置合理的磁场布局方案.Under the assumption of the low magnetic Reynolds number,the coupled model is established for the turbulent flow field and the externally applied magnetic field.The AUSMPW+scheme and LUSGS method are used to solve turbulent magnetohydrodynamics(MHD)flow equations,in which the Spalart-Allmaras oneequation turbulence model is used.A series of numerical simulations over various geometry configurations,namely,a flat plate and a compression corner,is conducted by using an external electromagnetic field.Results show that the performance of MHD boundary layer flow control is determined mainly by the Lorentz force in the streamwise direction.With an external magnetic field used,the low velocity fluid in the boundary layer can decelerate and increase the static temperature locally.Moreover,the counter-flow Lorentz force always brings a negative effect on the turbulent skin friction coefficient,and the location for the MHD zone has a great influence on the control efficiency of the ramp-induced separation.A reasonable magnetic field layout scheme should be configured in practical engineering application.

关 键 词：磁流体动力学 湍流边界层 多场耦合 流动控制 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程] V411