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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Fundamental Performance of Disk-shaped Magnetohydrodynamics Accelerator
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Fundamental Performance of Disk-shaped Magnetohydrodynamics Accelerator

机译：盘形磁流体动力学加速器的基本性能

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摘要

This paper investigates the acceleration performance of a disk-shaped magnetohydrodynamics (MHD) accelerator. Quasi-1-dimensional (Q1D) numerical simulation employing the MacCormack scheme was developed. For the longer channel length of 0.9 m, thermal loss was estimated at over 60% and effective acceleration could not be achieved owing to large heat loss and large friction loss. For shorter channel lengths, thermal loss can be reduced below 20% owing to the smaller heat and the friction losses. However, with too short a channel length, accelerator performance was decreased by the MHD compression due to excessive Faraday current density. The effect of ratio of cross sectional area on performance was also studied. For a larger area ratio, the gas can be accelerated smoothly throughout the MHD channel. However, for the excessive expansion case of a sevenfold channel, gas velocity near the exit decreased due to transition to a "generator mode". For the best acceleration performance, the design channel length should be as short as possible preventing compression at the channel inlet. The area ratio should be large enough to prevent the compression but not too large, to prevent transition to a "generator mode".
机译：本文研究了盘形磁流体动力学（MHD）加速器的加速性能。开发了采用MacCormack方案的准1维（Q1D）数值模拟。对于更长的0.9 m通道长度，估计热损失超过60％，并且由于大的热损失和大的摩擦损失而无法实现有效的加速。对于较短的通道长度，由于较小的热量和摩擦损失，可以将热损失降低到20％以下。但是，如果通道长度过短，则由于法拉第电流密度过大，MHD压缩会降低加速器性能。还研究了截面积比对性能的影响。对于较大的面积比，可以在整个MHD通道中平稳地加速气体。但是，对于七倍通道的过度膨胀情况，出口处的气体速度由于过渡到“发电机模式”而降低。为了获得最佳的加速性能，设计通道的长度应尽可能短，以防止通道入口处发生压缩。面积比应足够大以防止压缩，但又不能太大以防止过渡到“发电机模式”。

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