Abstract This article presented an experimental investigation of thermo-acoustic instability of RP-3 (Rocket Propellant 3) aviation kerosene under supercritical pressures in a vertical upward circular channel. The oscillation characteristics of measured parameters were studied. The mechanisms and characteristics of unstable flow and heat transfer were analyzed. The effects of operating parameters, including the inlet fluid temperature, inlet fluid pressure, mass flow rate, and heat flux, on flow and heat transfer instabilities were discussed. The investigation on boundary between stable and unstable conditions under various operating parameters was performed, and two new empirical correlations for critical heat flux prediction were obtained. Results indicate that the coupling relation between the inside-wall temperature, outlet fluid temperature, and inlet-outlet pressure drop is found. The instability of pseudo-film boiling leads to this unstable phenomenon. The critical heat flux increases as the inlet fluid pressure rises, while increases first and then decreases with the increasing Reynolds number of inlet fluid. The proposed correlations work reasonably well in predicting the onset of thermo-acoustic instability.

中文翻译：

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超临界RP-3燃料在垂直向上通道中流动的热声不稳定性机理及预测的实验分析

摘要 本文介绍了RP-3（火箭推进剂3）航空煤油在超临界压力下在垂直向上圆形通道中的热声不稳定性的实验研究。研究了测量参数的振荡特性。分析了不稳定流动和传热的机理和特点。讨论了运行参数对流动和传热不稳定性的影响，包括入口流体温度、入口流体压力、质量流量和热通量。对各种运行参数下稳定和不稳定条件之间的边界进行了调查，并获得了两个新的临界热通量预测经验相关性。结果表明，内壁温度、出口流体温度、并发现进出口压降。伪膜沸腾的不稳定性导致了这种不稳定现象。临界热通量随着入口流体压力的升高而增加，而随着入口流体雷诺数的增加，先增加后减小。所提出的相关性在预测热声不稳定性的发生方面工作得相当好。