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- 2018
超临界环己烷水平管内水动力学多值性研究
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Abstract:
针对高速飞行器内再生主动冷却技术中可能存在的流动不稳定问题,对超临界碳氢化合物的水动力学多值性进行了实验研究。结果表明:超临界流体存在水动力学多值性;提高工作压力或入口温度、降低热流密度、减小加热管长、增加管道内径,均有利于增加水平管内换热系统流动的稳定性,削弱水动力学多值特性。基于实验数据,采用归一化方法总结出了在实验工况范围内可用于预测流动不稳定起始点(onset of flow stability,OFI)的关联式。该关联式只由3个量纲一参数组成,却包含了5个影响OFI的重要参数,计算结果与实验结果之间的误差在10％以内。
Aiming at the flow instability in regenerative cooling technology, the hydrodynamic feature of super？？critical hydrocarbon is studied experimentally. The results show that multi？？valued hydrodynamic feature exists in super？？critical fluid. The multi？？valued feature weakens with the increasing system pressure and inlet temperature, but strengthens with the increasing heat flux. In addition, decreasing tube length or increasing tube internal diameter can improve the multi？？valued hydrodynamic feature so as to enhance flow stability. According to the experimental data, a correlation is obtained by dimensionless method to predict the onset of flow instability (OFI) for super？？critical fluid. The correlation consists of only three dimensionless parameters, but contains five important parameters affecting OFI. The error between the numerical and the experimental results gets within 10％
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