高焓激波风洞有效试验时间的诊断

doi:10.7527/S1000-6893.2015.0014

Abstract

Abstract:

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.

Key words: high enthalpy shock tunnel, effective test time, detonation driving, electrostatic probe, pressure

CLC Number:

V211.751

WANG Qiu, ZHAO Wei, YU Xilong, JIANG Zonglin. Effective test time measurement research for high enthalpy shock tunnel[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(11): 3534-3539.

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Effective test time measurement research for high enthalpy shock tunnel

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