基于石墨的宽温度区间快时变热载荷模拟方法

doi:10.7527/S1000-6893.2023.28732

Abstract

Abstract:

To solve the problem of large-range and rapid heating/cooling loading in hypersonic aircraft structural tests， a graphite-based simulation method of wide temperature range and rapidly time-varying aerothermal load is proposed. Firstly， a design process of ultra-high temperature environment based on flat graphite heating element is formed， and the thickness design and strength check method of flat graphite heating element considering the heating environment is proposed. Secondly， according to the demand of rapidly time-varying aerothermal load simulation， a fast heating method based on the decoupling of heating elements and test pieces is proposed， and the cooling efficiency of forced convection heat transfer in closed environment is analyzed. Finally， based on the above method， a test system for large-range and rapidly time-varying aerothermal load simulation is developed， and the test verification of ultra-high-temperature rapid heating/cooling is carried out for the carbon aerogel test piece. The research shows that the surface temperature response of the test piece is basically consistent with the design requirements， without noticeable hysteresis and slow transitions in temperature changes. For carbon-based flat-plate test pieces， the test system can achieve controlled multiple rapid heating and cooling within the range of 500-1 800 ℃， with heating/cooling rate reaching up to 10 ℃/s， thereby providing technical conditions for the thermal test of hypersonic aircraft structure.

Key words: thermal test, aerothermal load simulation, graphite heating, rapid heating/cooling, carbon aerogel

CLC Number:

V416.5

Yi ZHANG, Binwen WANG, Jingtao WU, Linhua CONG, Hong CHEN, Shiping LI. Graphite-based simulation method of wide temperature range and rapidly time-varying aerothermal load[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(3): 228732-228732.

Figures/Tables 10

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References 21

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温度/℃	降温速率/（℃·s^-1）
温度/℃	被动散热	强迫对流
1 200	97	154
1 100	69	142
1 000	44	82
900	33	61
800	22	46
700	11	35
600	8	24
500	5	17
400	2.8	14
350	2.2	10

[1]	ZHU Yandan, WEI Dong, LIU Shenshen, ZENG Lei, GUI Yewei. Power optimization of non-uniform aerodynamic heating simulated by quartz lamp array [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(6): 122761-122761.
[2]	ZHU Yandan, LIU Xiao, ZENG Lei, DU Yanxia, GUI Yewei. Optimization design of aerodynamic heating of large area simulated by quartz lamp array [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(9): 121159-121159.
[3]	LI Xiang, FU Bo. Thermal test technique of complex structure of hypersonic aircraft [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(S1): 73-79.

Graphite-based simulation method of wide temperature range and rapidly time-varying aerothermal load

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