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为了开展磁流体(MHD)流动控制原理研究,建立了磁流体技术试验系统,采用电容耦合射频-直流组合放电对Ma=3.5气流进行电离,在磁场作用下产生顺/逆气流方向的洛伦兹力控制流场,采用试验段静压变化来监测磁流体流动控制效果,通过一维模型计算磁流体流动控制过程中流场变化情况,分析磁流体流动控制效果;通过添加电磁源项的Navier-Stokes方程耦合电势泊松方程建立了二维磁流体动力模型,对磁流体流动控制进行数值模拟研究。主要结论如下:在磁场约束下,电容耦合射频-直流组合放电能够在Ma=3.5流场中产生大体积均匀电流,电导率约0.015S/m;在焦耳热和洛伦兹力作用下,磁流体加速时静压升高了130Pa,减速时静压升高了200Pa;磁流体流动控制过程中,仅有不足10%的能量在磁流体通道内发生了作用;数值模拟结果显示,在试验条件下,加速时静压升高了128Pa,减速时静压升高了208Pa,与试验结果基本吻合。
In order to carry out the MHD flow control theory, a magnetic fluid technology test system was established. The capacitively coupled RF-DC combined discharge was used to ionize the Ma = 3.5 gas flow and generate Lorentz Force control of the flow field, the use of static pressure changes in the test section to monitor the effect of magnetic fluid flow control, through the one-dimensional model to calculate the flow field during the magneto-fluid flow control changes, analyze the flow control effect of magnetic fluid; Stokes equations coupling potential Poisson equation Two-dimensional magnetohydrodynamic model was established to study the numerical simulation of magneto-fluid flow control. The main conclusions are as follows: Under the magnetic field constraint, the capacitively coupled RF-DC combined discharge can generate a large volume uniform current in the Ma = 3.5 flow field with a conductivity of about 0.015 S / m. Under Joule heat and Lorentz force, Hydrostatic pressure increased 130Pa during acceleration and 200Pa during deceleration; only less than 10% of the energy in the magneto-fluid flow control process took place in the magnetic fluid passage. The numerical simulation results show that under the conditions of test , The static pressure increased by 128 Pa during acceleration and the static pressure increased by 208 Pa during deceleration, which was in good agreement with the test results.