Calculation of thermal load and impact factor analysis for hypersonic vehicle
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摘要: 对吸热式热防护系统和液氮为冷源的高超声速飞行器热控系统,分别采用辐射热平衡法和双层集总参数法,建立了隔热层和舱内温度场的热力学模型,实现了气动加热、隔热层导热及舱内温度场等各传热环节的解耦.在此基础上,按照X-34验证机的飞行剖面对高超声速飞行器电子设备舱热载荷进行了计算,并分析了隔热层厚度、舱内冷却气体流速及液氮量对舱内温度和电子设备温度的影响.结果表明,该方法对热传递过程各环节响应特性能够较准确的分析,在工程方案初步设计阶段具有重要的应用价值.Abstract: Endothermal thermal protection system (TPS) and liquid N2 heat sink were chosen to calculate the characteristics of thermal control system (TCS) in hypersonic vehicle. The methods of radiation balance and double lumped parameter were adopted to obtain the thermodynamic model of adiabatic layer and cabin air temperature. Therefore, aeroheating, adiabatic layer heat transfer and cabin air temperature were decoupled. On the basis of flight profile of X-34 hypersonic vehicle, the thermal load of avionics bay was calculated. Besides, the influence of adiabatic layer, cooling gas velocity and liquid N2 amount on cabin air as well as the equipment temperature were analyzed. The results show that this method could get the response characteristics of heat transfer sections, which played an important part in the primary stage of hypersonic vehicle design.
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Key words:
- hypersonic flow /
- vehicle /
- thermal control system /
- thermal protection system /
- thermal load
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