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首页> 外文期刊>Journal of Spacecraft and Rockets >Kinetic and Continuum Simulations of Electromagnetic Control of a Simulated Reentry Flow
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Kinetic and Continuum Simulations of Electromagnetic Control of a Simulated Reentry Flow

机译：模拟折返流电磁控制的动力学和连续性模拟

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Electromagnetic control of a weakly ionized supersonic rarefied argon flow past a magnetized blunt body is simulated using the direct simulation Monte Carlo method with Ohm's law. According to the corresponding experiment using an arcjet wind tunnel, the Knudsen and Mach numbers of the flow are, respectively, 0.05 and 1.7, and a dipolar magnetic field for which the maximum value is about 0.4 T is imposed around the body. Although the Hall and ion slip effects are estimated to be significant in the flow, the present computations ignore these effects, for simplicity. The result is compared not only with the experimental result but also with the simulated result using Navier-Stokes computation. The kinetic (direct simulation Monte Carlo) and continuum (Navier-Stokes) simulations produced almost identical translational temperature distributions with application and with no application of a magnetic field. Results show that the continuum approximation is acceptable to predict the flow structure. Both simulations roughly reproduced the measured shock layer enlargement resulting from the Lorentz force against the flow direction and predicted the resulting reduction of the net heat load on the body. In addition, the direct simulation Monte Carlo correctly predicted the drag measured in the case of the not-applied field and verified the electromagnetic drag increase measured qualitatively in the case of the applied field; the electromagnetic effect increases the total drag, because the reaction of the generated Lorentz force prominently exceeds the slight decrease of aerodynamic drag caused by the shock layer enlargement.
机译：使用具有欧姆定律的直接模拟蒙特卡罗方法，模拟了经过离子化钝体的弱电离超音速稀氩流的电磁控制。根据使用电弧喷射风洞的相应实验，气流的克努森数和马赫数分别为0.05和1.7，并且在身体周围施加了最大值约为0.4 T的偶极磁场。尽管霍尔和离子滑移效应估计在流动中很重要，但为简单起见，本计算忽略了这些效应。使用Navier-Stokes计算，不仅将结果与实验结果进行比较，还将结果与模拟结果进行比较。动力学（直接模拟蒙特卡洛）和连续体（Navier-Stokes）模拟在施加和不施加磁场的情况下产生几乎相同的平移温度分布。结果表明，连续近似法可以用来预测流动结构。两种模拟都粗略地再现了洛伦兹力对流向所产生的测得的激波层的增大，并预测了净热负荷在人体上的减小。另外，直接模拟蒙特卡洛正确地预测了在不施加磁场的情况下测得的阻力，并验证了在施加磁场的情况下定性测得的电磁阻力的增加；电磁效应会增加总阻力，因为所产生的洛伦兹力的反作用力明显超过了由于冲击层扩大而引起的空气阻力的轻微下降。

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