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高焓激波风洞能够产生模拟高马赫数飞行条件的气流总温,是研究高温气体效应以及通讯中断问题的有效地面试验设备.本文在JF-10高焓激波风洞总焓16 MJ/kg、总温7900 K的高超声速试验气流状态下,采用能够获得足够空间分辨率且不影响流场结构的针状探针,发展了静电探针测试技术并对10°尖劈模型流场进行了电子密度测量.试验结果表明:研制的探针能够获得模型流场空间电子密度分布规律且具有较好的测量重复性;恒定偏压方法能够获得耦合流场参数的无量纲电子密度,而发展的新型高频扫描电路能有效降低扫描电路中的干扰噪音,提高测量的精度,获得定量电子密度值.
High-enthalpy shock wind tunnel can produce the total temperature of the airflow simulating the high Mach number flight condition, which is an effective ground test device for studying the high-temperature gas effect and the communication interruption problem.In this paper, the total enthalpy of the JF-10 enthalpy wind tunnel is 16 MJ / kg and a total temperature of 7900 K, the electrostatic probe test technique was developed and the flow field of 10 ° wedge split model was developed by using the acicular probe which can obtain sufficient spatial resolution without affecting the flow field structure. Electron density measurement.The experimental results show that the developed probe can obtain the space electron density distribution of the model flow field and has good repeatability of measurement. The constant bias method can obtain the dimensionless electron density of the coupled flow field parameters, and the development The new high frequency scanning circuit can effectively reduce the interference noise in the scanning circuit, improve the measurement accuracy and obtain the quantitative electron density value.