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采用自行设计的动压探针,测量了大气压和真空环境下冷态氮气自由/冲击射流动压分布,以及真空环境下氮/氢混合气电弧加热推力器羽流的动压分布。将动压径向分布积分所得结果与冲击平板法间接测得的推力值做了比较。结果表明,大气压环境下测得的冷态氮气自由/冲击射流动压分布呈现明显的亚声速流动的特点,真空环境下测得的冷态射流动压显示有波系存在的超声速流动状态;而氮/氢混合气电弧加热推力器羽流的动压分布中看不出羽流中明显的激波存在。在一定条件下,即在较高马赫数的超声速射流中,探针不影响气流在喷管内的膨胀过程,以及羽流速度和密度没有过分降低的区间内,动压探针测量数据径向积分的结果可以代表电弧加热推力器的推力。
The dynamic pressure distribution of free / impinging jet of cold nitrogen and the dynamic pressure distribution of nitrogen / hydrogen mixed arc heated thruster under vacuum were measured by using self-designed dynamic pressure probe. The results obtained by integrating the dynamic pressure radial distribution were compared with the thrust values indirectly measured by impact plate method. The results show that the dynamic pressure distribution of free / impinging jet of cold nitrogen measured under atmospheric pressure shows obvious sub-sonic flow, and the dynamic pressure of cold jet measured under vacuum shows the existence of supersonic flow. The apparent shock wave in the plume can not be seen in the dynamic pressure distribution of the nitrogen / hydrogen mixture arc heated thrusters. Under certain conditions, that is, at higher Mach number supersonic jets, the probe does not affect the expansion process of the air stream within the nozzle and the plume radial and radial density of the probe data are not significantly reduced The result may represent the thrust of the arc heated thruster.