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本文总结了近几年来在φ800mm激波管上对高温空气电子密度所做的大量测量工作。在ρ_1=1.3—133帕斯卡,M_s=9—22.5的范围内,使用了近自由分子流Langmuir探针、普通微波透射仪、高灵敏度微波透射仪和反射仪、微波干涉仪等对正激波后的电子密度进行了系统地测量。在各种参数状态下,全部实验数据均符合在同一激波马赫数下n_g正比于ρ_1的经验规律。实验测量结果与目前工程上常用的各种理论计算图表进行了对比,验证了这些图表的可用性。
This article summarizes a large number of measurements made on the electron density of high temperature air over a φ800 mm shock tube in recent years. In the range of ρ_1 = 1.3-133 Pascal, M_s = 9-22.5, the near free molecular flow Langmuir probe, ordinary microwave transmission instrument, high sensitivity microwave transmission instrument and reflection instrument, microwave interferometer, The electron density was systematically measured. Under the condition of various parameters, all the experimental data are in accordance with the empirical rule that n_g is proportional to ρ_1 under the same shock Mach number. The experimental measurement results are compared with various theoretical calculation charts commonly used in engineering at present, and the usability of these charts is verified.