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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Numerical simulation of plasma-fluid flow and performance in a disc MHD generator with contoured walls
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Numerical simulation of plasma-fluid flow and performance in a disc MHD generator with contoured walls

机译：等高壁面圆盘MHD发生器中等离子体流体流动和性能的数值模拟

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Two-dimensional large eddy simulations have been carried out in order to investigate the performance of two disc MHD generators with different disc walls cross-sectional profiles. The first disc MHD generator has been designed with a 'typically-used' straight disc walls profile; the second, on the other hand, presents a contoured disc walls profile. The numerical results, obtained for a set of realistic working conditions and very fine grid meshes, show that the generator with contoured walls achieves the highest generator performance, measured in terms of enthalpy extraction and isentropic efficiency, because of improvements in flow behaviour and plasma conditions. In particular, under optimum generator performance conditions, a high Mach number-low static pressure MHD flow is realized in the generator with contoured disc walls. Here, the Lorentz force is not able to significantly drag the supersonic MHD flow even if a high magnetic flux density (4-8 T) is applied. As a consequence, MHD generators with contoured disc walls could achieve the generator performance target for commercialization of MHD power generation.
机译：为了研究具有不同圆盘壁横截面轮廓的两个圆盘MHD发生器的性能，已经进行了二维大涡模拟。第一台磁盘MHD发生器的设计具有“通常使用的”直盘壁轮廓。另一方面，第二个呈现出轮廓化的圆盘壁轮廓。在一组实际工作条件和非常精细的网格下获得的数值结果表明，由于焓变和等熵效率的提高，具有波状壁的发生器可实现最高的发生器性能，这是因为流动特性和等离子体条件的改善。特别是，在最佳发电机性能条件下，具有轮廓圆盘壁的发电机可实现高马赫数-低静压MHD流量。在此，即使施加了高磁通密度（4-8 T），洛伦兹力也无法显着地拖住超音速MHD流。结果，具有轮廓盘壁的MHD发电机可以实现发电机性能目标，以实现MHD发电的商业化。

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