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通过实验研究发现了超临界吸热型碳氢燃料供油系统的压力降型不稳定现象。为了研究稳定机理和超临界吸热型碳氢燃料裂解特性对供油系统稳定性的影响,建立了零维平衡流模型,并针对不同裂解特性的燃料进行了对比仿真。研究结果表明,由于裂解反应的发生,超临界碳氢燃料供油系统存在临界区和裂解区两个不稳定区间。基于零维平衡流模型较好地复现不稳定实验现象,不稳定机理得到了详细的解释。密度随温度的变化是系统正反馈的重要环节之一,其剧烈的变化率是导致系统不稳定的主要原因,燃油裂解速率越快,其裂解产物密度相对变化率随温度变化越大,越容易引起供油系统的不稳定。
Experimental studies have found that the pressure drop instability of the supercritical endothermic hydrocarbon fuel supply system. In order to study the stability mechanism and the effect of supercritical endothermic hydrocarbon cracking on the stability of the fuel supply system, a zero-balance flow model was established and compared with the fuel with different cracking characteristics. The results show that due to the occurrence of cleavage reaction, the supercritical hydrocarbon fuel supply system has two unstable regions, the critical region and the pyrolysis region. Based on the zero-dimensional equilibrium flow model, the phenomenon of instability experiment can be well reproduced, and the instability mechanism has been explained in detail. The change of density with temperature is one of the most important parts of positive feedback of the system. The violent change rate is the main reason leading to system instability. The faster the rate of fuel cracking, the easier it is to change the relative change rate of the cracked product density with temperature Caused the instability of oil supply system.