再入飞行器表面磁流体发电装置数值模拟  

Numerical simulation of external MHD generator on board reentry vehicles

作　　者：陈刚[1] 张劲柏[1] 李椿萱[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《北京航空航天大学学报》2010年第2期135-139,共5页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：提出了钝锥型再入飞行器上的表面磁流体发电装置方案,采用低磁雷诺数近似下的磁流体力学模型对其进行了流动与静电场耦合的数值模拟,由此建立了表面磁流体发电装置中的物理图像.数值模拟结果表明,在典型再入条件(飞行高度46 km,速度7 km/s)下,所提出表面磁流体发电装置方案能够实现兆瓦级(电功率1.28MW)能量输出,电能提取导致再入飞行器阻力增大13.7%,对飞行器壁面总热流值的影响并不显著,但发电区域及其下游壁面的热流密度分布发生明显变化,该区域内热流密度峰值发生于电极的前、后缘.A scenario of external magnetohydrodynamic （MHD） generator on board blunt-cone based reentry vehicles was proposed, and numerical parametric studies by employing an MHD model based on the low magnetic Reynolds number approximation were performed. Following the numerical results, the physical features of the external MHD generator were drawn. One may conclude that the power output of the external MHD generator is capable of providing energy output up to 1.28 MW under the typical reentry condition （flight height 46 km,velocity 7 km/s）. Under the MHD power extracting operation, the drag coefficient of the reentry vehicle is raised by 13.7% , whereas the total wall heat flux varies mildly. However, the distribution of heat flux density in the MHD power extraction zone and downstream differs distinctly from that in the original N-S flow. The peak heat flux densities in the area occur at the tips of the electrodes.

关 键 词：再入飞行器 表面磁流体发电装置 磁雷诺数 电能提取 

分 类 号：O361.3[理学—流体力学]