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Numerical and Experimental Studies on Non Equilibrium Flows in MPD Arc Jets.

MPD 电弧射流中非平衡流动的数值和实验研究。

基本信息

批准号：
07651128
负责人：
KIMURA Itsuro
金额：
$ 1.28万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Numerical Studies on steady one-dimensional self-field MPD arc jets were conducted, taking into consideration the non-equilibrium ionization and dissociatin, and the thermal non-equilibrium. Following results were obtained :1. The current concentration is observed at the entrance and the exit of the channel in the case of argon and it is observed only at the exit of the channel in the case of hydrogen.2. The electrical conductivity is proportional to the 3/2 powers of electron temperature in the case of argon, while it is proportional to the root of that in the case of hydrogen.3. The operation of arc jets is influenced mainly by a characteristic velocity and entrance mach numbers, and also by a characteristic energy.Experimental studies on the effect of constrictor size and anode geometry (nozzle type, flare type, straight type) on the performance of arc jets were conducted using nitrogen or argon propellants. Following results were obtained :1. The electron temperature, the vibrational and rotational temperatures of molecules can be assumed in equilibrium in arc jets for the case of nitrogen propellant.2. The performance of arc jets is improved as the length and diameter of the constrictor are decreased, but the arc does not established under a critical diameter.3. The temperature and heat content of the gas ejected from arc jets are influenced by constrictor geometry but the effect of gas pressure on them is small.4. In the case of argon propellant, in the range of arc current, 50-350 A,the best performance was obtained for the flare type andhe with small diameter, operated at a low mass flow rate.

对稳态一维自场MPD电弧射流进行了数值研究，考虑了非平衡电离、离解和热非平衡。获得了以下结果：1.在氩气的情况下，在通道的入口和出口处观察到电流浓度，并且在氢气的情况下，仅在通道的出口处观察到电流浓度。在氩的情况下，电导率与电子温度的3/2次方成正比，而在氢的情况下，电导率与电子温度的3/2次方成正比.电弧射流的工作主要受特征速度和入口马赫数的影响，也受特征能量的影响，实验研究了收缩器尺寸和阳极几何形状（喷嘴型、喇叭型、直型）对氮、氩推进剂电弧射流性能的影响。获得了以下结果：1.对于氮气推进剂，电弧射流中的电子温度、分子的振动温度和转动温度可以假定处于平衡状态.减小收缩段的长度和直径可以提高电弧射流的性能，但在临界直径以下电弧不能建立.电弧射流喷出气体的温度和热含量受压缩器几何形状的影响，但受气体压力的影响较小.在氩气推进剂的情况下，在电弧电流50-350 A的范围内，小直径火炬型在低质量流量下获得最佳性能。