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通过数值求解含有碱金属杂质碳酚醛烧蚀效应的层流与湍流化学非平衡Navier-Stokes控制方程,理论预测了无线电衰减测量计划(RAM)-C系列钝锥体前两次再入等离子体鞘套电子数密度。计算结果包括化学非平衡纯空气流场结果以及含碱金属杂质的碳酚醛烧蚀流场结果,并和文献发表的飞行器上朗缪尔探针、反射计等离子体诊断数据,以及从信标和遥测信号衰减中获得的等离子体相关数据进行了比较,获得了与试验分析结论相一致的碱金属电离对电子数密度峰值影响随高度变化趋势。理论计算与飞行试验结果均表明:烧蚀材料中的碱金属电离会显著增加中低空飞行器等离子体鞘套的电子数密度,最高可达2~3个量级。
By numerical solution of the laminar and turbulent chemically unbalanced Navier-Stokes governing equations with carbon-phenolic ablation effects of alkali metal impurities, the theoretical predictions of the first two reentrant plasma sheaths of the radio-frequency attenuation measurement program (RAM) -C series of blunt cones Set of electronic number density. The calculation results include the results of chemical non-equilibrium pure air flow field and the results of carbon-phenolic ablation flowfields containing alkali metal impurities. In addition, the Langmuir probe and reflectometer plasma diagnostic data published in the literature, Plasma-related data obtained from telemetering signal attenuation were compared and the effect of alkali metal ionization peak height on electron density consistent with the experimental analysis was obtained. Both theoretical calculations and flight test results show that the alkali metal ionization in ablative materials can significantly increase the electron density of plasma sheaths for medium and low altitude aircraft up to 2 to 3 orders of magnitude.