The spray characteristics of a pressure-swirl nozzle have an important impact on the performance of an aeroengine. In this work, the spray experiment of a pressure-swirl nozzle was conducted in a constant volume chamber to mimic the combustion chamber environment of a real aeroengine. n-Decane, chosen as a surrogate of aviation fuel, was injected into different environmental conditions to analyze its spray characteristics. A coupling numerical method, using the Euler continuum model for the flow inside the nozzle and the Lagrange discrete phase model for the external spray, was implemented to simulate the fuel injection process under the same environmental conditions as the experiment. The results show that the interface of the gas-liquid two-phase flow becomes larger with the increase of environmental pressure P_env, while the gradients of axial velocity V_z and tangential velocity V_θ decrease. The spray cone angle decreases rapidly and remains nearly unchanged with the increase of P_env. This coupling numerical method underestimated the specific value of the spray cone angle but can closely predict the trend of spray cone angle with the increase of P_env. Generally, this work is valuable for the design of fuel injection systems of aeroengines.

中文翻译：

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从压力旋流喷嘴排放到类似航空发动机的条件下的正癸烷喷雾特性的实验和计算分析

压力涡流喷嘴的喷雾特性对航空发动机的性能具有重要影响。在这项工作中，压力涡流喷嘴的喷雾实验是在一个等容室中进行的，以模拟真实航空发动机的燃烧室环境。选择作为航空燃料替代品的正癸烷被注入不同的环境条件以分析其喷雾特性。在与实验相同的环境条件下，采用耦合数值方法，使用欧拉连续模型对喷嘴内的流动和拉格朗日离散相模型进行外部喷雾，以模拟燃料喷射过程。_{结果表明，随着环境压力P env}的增加，气液两相流的界面变大。, 而轴向速度 V _z和切向速度 V _θ的梯度减小。_{随着P env}的增加，喷雾锥角迅速减小并几乎保持不变。这种耦合数值方法低估了喷雾锥角的具体值，但可以准确预测喷雾锥角随P _env增加的趋势。一般来说，这项工作对于航空发动机燃油喷射系统的设计是有价值的。