TAILIEUCHUNG - Numerical simulation of external MHD generator on board reentry vehicle
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. | Journal of Automation and Control Engineering Vol. 4, No. 4, August 2016 Numerical Simulation of External MHD Generator on Board Reentry Vehicle Gang Chen, Huaping Zhen, Xiaoxuan Li, Wei Su, and Chao Dong Beijing Institute of Space Long March Vehicle, Beijing, China Email: chengang107@, tracypp16@ Abstract—A scenario of external magneto hydrodynamic (MHD) generator on board blunt-cone based re-entry 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 under the typical reentry condition (flight height 46km, velocity7km/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. Index Terms—reentry vehicle, external MHD generator, magnetic Reynolds number, power extraction I. INTRODUCTION The utilization of plasmas for enhancing and controlling re-entry vehicle performances has been investigated in several papers [1]-[7]. There are two primary types of applications for this kind of hypersonic flow control concepts, namely, (1) the utilization of offbody plasmas for drag reduction and steering [1]-[4]; (2) the use of near surface plasmas combined with magnetic field for heat flux management [5-7]. For real sized vehicles, the energies required for these applications exceed the present capability of on-board auxiliary power units. Therefore, it is necessary for the re-entry vehicle to equip with an onboard power .
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