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研究了超临界压力下国产航空煤油RP-3在竖直并联U型管中的流量分配特性,分析了工质温度、系统压力以及加热热流密度不对称性对流量分配特性的影响规律.其中实验段内、外径分别为1.8mm和2.2mm,实验中质量流量保持为4g/s,系统压力变化范围为3～5MPa,热流密度变化范围为q=60～240kW/m2.实验结果表明:较低系统压力下,等热流密度加热至管路油温达到拟临界温度附近时会诱发支管流量的较大变化,从而导致并联管系统各支路流量的重新分配;加热不均对支路流量的影响非常显著;另外,提高系统压力可以有效抑制并联管系统中各支路流量分配失衡,增强系统的稳定性.
The flow distribution characteristics of domestic aviation kerosene RP-3 in a vertical parallel U-shaped tube under supercritical pressure were studied. The effects of working fluid temperature, system pressure and asymmetry of heating heat flux density on flow distribution characteristics were analyzed. The inner and outer diameters of the sections are 1.8mm and 2.2mm respectively. The mass flow rate is kept at 4g / s in the experiment, the system pressure is in the range of 3 ~ 5MPa and the heat flux density is in the range of q = 60 ~ 240kW / m2. Under low system pressure, if the heat flux density is heated up to the temperature near the pseudo-critical temperature, the branch flow will be greatly changed, which will lead to the redistribution of the branch flow in the parallel pipe system. In addition, increasing the system pressure can effectively suppress the imbalance of flow distribution in each branch of the parallel pipe system and enhance the stability of the system.