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本文利用大涡模拟方法对喷孔内流和近喷孔区域的燃油雾化过程进行数值模拟研究。为了能更加准确地模拟喷孔内流,本文根据实际喷油器结构设定了计算域,能够考虑针阀、油囊和喷孔结构对喷孔内流的影响。结果表明:在考虑了具体的喷油器结构参数情况下,采用气液两相流大涡模拟能够获得与实验非常接近的喷束结构;喷孔内流的非轴对称分布是引起射流非轴对称型扰动的原因;这种非轴对称扰动使喷束变为非轴对称结构。结果还显示这种非轴对称扰动具有远大于表面波的振幅和波长。
In this paper, the large-eddy simulation method is used to simulate the process of fuel atomization in the inner and outer nozzle holes. In order to simulate the inner flow of the nozzle more accurately, this paper sets the calculation domain according to the actual injector structure, which can consider the influence of the needle valve, the oil bag and the nozzle structure on the inner flow of the nozzle. The results show that the jet structure can be obtained by the large eddy simulation of gas-liquid two-phase flow under the condition of considering the specific injector structural parameters. The non-axisymmetric distribution of the inner flow of the jet is caused by the non- The reason for symmetric perturbation; this non-axisymmetric perturbation turns the jet into a non-axisymmetric structure. The results also show that this non-axisymmetric perturbation has far greater amplitude and wavelength than surface waves.