一种改进的空气等离子体状态方程
An improved equation of state for air plasma simulations
摘要：
这项工作是关注的发展一种新的，准确的状态方程描述局部热力学平衡的部分电离空气等离子体。这种新的状态方程的一个关键应用是飞机雷击的模拟。由于物种电离和相互作用的复杂性，虽然热力学性质的唯象曲线拟合是可能的，这些曲线是难以实际的数值模拟。参数大小的巨大差异（许多数量级）和方程的复杂性意味着它们不能直接反演热力学变量之间的转换。本文的方法是采取一个精确的19种唯象模型，并使用它来生成一个列表数据集。再加上一个合适的插值程序，这提供了一个准确的和计算效率高的技术模拟部分电离空气等离子体。的状态方程内实现的多物理方法，可以解决等离子体电弧和弹塑性材料基板之间的双向耦合。实验结果，无论是单一材料的等离子体，和电弧耦合到基板的实施进行了验证。它表明，准确的，无振荡的热力学配置文件，可以得到良好的结果，甚至接近材料表面。
英文摘要：
This work is concerned with the development of a novel, accurate equation of state for describing partially ionised air plasma in local thermodynamic equilibrium. One key application for this new equation of state is the simulation of lightning strike on aircraft. Due to the complexities of species ionisation and interaction, although phenomenological curve fitting of thermodynamic properties is possible, these curves are intractable for practical numerical simulation. The large difference in size of the parameters (many orders of magnitude) and complexity of the equations means they are not straightforward to invert for conversion between thermodynamic variables. The approach of this paper is to take an accurate 19-species phenomenological model, and use this to generate a tabulated data set. Coupled with a suitable interpolation procedure this offers an accurate and computationally efficient technique for simulating partially ionised air plasma. The equation of state is implemented within a multiphysics methodology which can solve for two-way coupling between a plasma arc and an elastoplastic material substrate. The implementation is validated against experimental results, both for a single material plasma, and an arc coupled to a substrate. It is demonstrated that accurate, oscillation-free thermodynamic profiles can be obtained, with good results even close to material surfaces.
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