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首页> 外文期刊>AIAA Journal >Three-Dimensional Modeling of Magnetic Nozzle Processes
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Three-Dimensional Modeling of Magnetic Nozzle Processes

机译：磁喷嘴过程的三维建模

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Simulations of plasma flow through a magnetic nozzle were conducted using the tune-dependent, three-dimensional magnetohydrodynamics code MACH3. Modeling of magnetic nozzle flow using constant, classical isotropic, and classical tensor resistivity provides preliminary quantitative depiction of the core-plasma flow, evolution of the magnetic field, and conversion of stagnation enthalpy to directed exhaust thrust energy, and serves as verification for the numerical model. For stagnation conditions of 100 eV and 0.355 MPa, steady-state modeling using helium propellant demonstrates a nearly isentropic expansion through the nozzle to exhaust speeds near 160 km/s. The extent of the contribution from the magnetic diffusion and the mass-flux penetration to the thickness of the current layer strongly depends on plasma resistivity. Plasma-field interaction results in a reduction of approximately 50% of the directed axial thrust when compared with a solid-wall nozzle of equivalent Mach number design. At fixed plasma pressure and applied field the exhaust velocity scales appropriately as the square root of the stagnation temperature.
机译：使用依赖于声调的三维磁流体动力学代码MACH3对通过磁喷嘴的等离子体流进行了模拟。使用恒定的，经典的各向同性和经典的张量电阻率对电磁喷嘴流进行建模，可以提供对核心-等离子体流，磁场演化以及停滞焓向定向排气推力能量的转换的初步定量描述，并可以用来验证数值模型。对于100 eV和0.355 MPa的停滞条件，使用氦气推进剂进行的稳态建模表明，通过喷嘴达到近等熵膨胀，排气速度接近160 km / s。磁扩散和质量通量渗透对电流层厚度的贡献程度在很大程度上取决于等离子体电阻率。与等效马赫数设计的实壁喷嘴相比，等离子场相互作用导致轴向轴向推力降低约50％。在固定的等离子压力和外加电场下，排气速度适当地缩放为停滞温度的平方根。

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