Calculations of Thermophysical Properties of High Energy Flow With Dissociation and Ionization
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摘要: 为准确进行电弧喷射推力器非平衡流动分析,对高能解离流动化学动力学过程、热力学性质、输运性质和电磁特性进行了数值计算.采用有限速率化学动力学模型计算解离组分,采用基于配分函数法和维里系数法的曲线拟合计算热力学性质,采用经典Chapman-Enskog方法获得多组分混合气体输运性质,采用由电子运动方程和统计力学碰撞理论推导出的公式计算电导率和电子漂移率.通过计算示例了温度在3.0×103~2.0×104K和压强为0.1 Pa~1 MPa范围的N2解离物性.Abstract: To achieve exact analysis of non-equilibrium flow within arcjet, numerical calculations of chemical kinetics, thermodynamic properties, transport properties, and electromagnetic characteristics of high energy flow with dissociation and ionization were carried out. A finite rate chemical kinetic model was adopted to compute the components under dissociation and ionization. The curve fits based on partition function approach and virial coefficient method were used to calculate the thermodynamic properties, and the mixing laws from the classical Chapman-Enskog procedure were introduced to obtain the transport properties of multicomponent gas mixtures. The electrical conductivity and electronic mobility were estimated by formulas derived from the motion equation of electrons and the statistical mechanics. The thermophysical properties of nitrogen under dissociation and ionization are presented by the calculations in the range of 3.0×103 to 2.0×104 K and 0.1 Pa to 1 MPa.
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