The LOX/methane engine has an admirable performance under a supercritical state. However, the properties of methane change drastically with varying injection temperature. Because the injector can greatly affect the atomization and combustion, this study performed a three-dimensional numerical simulation of atomization, combustion, and heat transfer in a subscale LOX/methane engine to evaluate the effect of the main fluid parameters with different methane injection temperatures and different injectors on atomization performance and combustion performance. The results show that the larger propellant momentum ratio and Weber number can improve the heat flux and combustion stability in shear coaxial injector, while the influence in swirl coaxial injector is relatively small. Moreover, in shear coaxial injector and in swirl coaxial injector, the larger propellant momentum ratio and Weber number can reduce the droplet size, enhance atomization performance, and improve the combustion efficiency. The numerical model provides an economical method to evaluate the main fluid parameters and proposes new design principles of injectors in LOX/methane engine.

中文翻译：

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LOX /甲烷发动机同轴喷油器燃烧和雾化特性的数值研究

LOX /甲烷发动机在超临界状态下具有令人钦佩的性能。但是，甲烷的性质会随着注入温度的变化而急剧变化。因为喷油器会极大地影响雾化和燃烧，所以本研究对次刻度LOX /甲烷发动机进行了雾化，燃烧和传热的三维数值模拟，以评估不同甲烷注入温度和温度下主要流体参数的影响。不同的喷油器在雾化性能和燃烧性能上。结果表明，较大的推进剂动量比和韦伯数可以提高剪切同轴喷油器的热通量和燃烧稳定性，而涡旋同轴喷油器的影响相对较小。此外，在剪切同轴喷射器和涡旋同轴喷射器中，较大的推进剂动量比和韦伯数可减小液滴尺寸，增强雾化性能，并提高燃烧效率。该数值模型为评估主要流体参数提供了一种经济的方法，并提出了LOX /甲烷发动机喷油器的新设计原理。