高焓激波风洞有效试验时间的诊断
收稿日期: 2014-12-03
修回日期: 2015-01-08
网络出版日期: 2015-01-12
基金资助
国家自然科学基金(11402275)
Effective test time measurement research for high enthalpy shock tunnel
Received date: 2014-12-03
Revised date: 2015-01-08
Online published: 2015-01-12
Supported by
National Natural Science Foundation of China (11402275)
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,是研究高温真实气体效应以及再入物理问题的有效试验装备,但是激波风洞的试验时间较短,且随着气流焓值的提高大幅降低,仅为几毫秒,因此试验测试数据曲线中有效时间段的分辨十分重要,它直接影响到试验结果的可靠性及精度。鉴于此,采用压力测量、静电探针测量、非接触光学测量和热流测量的方式,针对中国科学院力学研究所JF-10高焓激波风洞16 MJ/kg总焓、7700 K总温的流场状态,对比研究了风洞喷管的起动时间以及有效测试时间。试验结果表明:静电探针测量方法最为有效地分辨了喷管起动时间段、有效试验时间段以及驱动气体的到达; JF-10高焓风洞在16 MJ/kg的状态下,喷管起动时间约为1.3 ms,风洞有效试验时间约为2 ms。
汪球 , 赵伟 , 余西龙 , 姜宗林 . 高焓激波风洞有效试验时间的诊断[J]. 航空学报, 2015 , 36(11) : 3534 -3539 . DOI: 10.7527/S1000-6893.2015.0014
The high enthalpy shock tunnel, which can provide the high-temperature gas conditions for hypersonic flight, is an effective ground facility for the research of reentry problems. It also has the ability of studying real gas effect. However, the effective test time of a high enthalpy shock tunnel is short, in the order of milliseconds, and the higher of the enthalpy value, the shorter the test time. In such a short time, determination of the effective test time from the test curve for a high enthalpy shock tunnel is highly important, or the reliability and accuracy of the experimental result will be affected. This paper is based on the JF-10 high enthalpy shock tunnel in the Institute of Mechanics. The hypersonic test flow condition with the stagnation enthalpy of 16 MJ/kg and stagnation temperature of 7700 K is achieved using the forward detonation method. The experiments of pressure measurement, electrostatic probe, non-contact optical measurement and heat flux measurement are conducted. The nozzle starting time and effective test time are then studied. Results show that under the above test condition, the nozzle starting time of the JF-10 high enthalpy shock tunnel is about 1.3 ms and effective test time is about 2 ms. And electrostatic probe method turns out to be the most effective for determining the nozzle starting time, effective test time and arrival of the driving gas.
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