Three-dimensional simulation of a gas-centered swirl coaxial injector spray under pulsation conditions
Three-dimensional simulation of a gas-centered swirl coaxial injector spray under pulsation conditions
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DOI：
10.1063/5.0149575
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发表时间：
2023-05
期刊：
影响因子：
1.6
通讯作者：
Yuchao Gao;W. Chu;J. Kang;Chuanjin Jiang;Lingyu Su;Yiheng Tong;Wei Lin
中科院分区：
文献类型：
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作者：
Yuchao Gao;W. Chu;J. Kang;Chuanjin Jiang;Lingyu Su;Yiheng Tong;Wei Lin
在稳态实验的基础上，进行了脉动条件下的三维仿真研究。研究了供油系统脉动对同轴式气心旋流喷嘴雾化特性的影响。结果表明，在速调管效应作用下，喷雾形态呈宝塔状。当低频脉动（200 Hz）施加到液体入口时，出口压力的峰值接近入口质量流量的谷值。同时，出口质量流量和压力近似为正弦曲线。出口质量流量对入口质量流量的响应没有明显的滞后效应，但有一个小的锯齿状振荡。增大液体入口扰动幅值会使出口质量流量脉动增大，大于设定的入口脉动幅值。当液体入口脉动的频率增加到1000 Hz时，喷射器出口质量流率和压力变化的主频率显著小于入口脉动频率。这是由于环形狭缝的低通滤波效应。对于进气脉动，总体喷雾形态没有显著变化。在相同幅值和频率的脉动作用下，液体入口脉动对喷油器出口喷雾的影响大于气体入口脉动。
Based on steady-state experiments, a three-dimensional (3D) simulation study under pulsation conditions was carried out. This was performed to study the effect of pulsation of the supply system on the atomization characteristics of a gas-centered swirl coaxial injector. The results indicated that the spray shape resembled a pagoda when the Klystron effect occurred. When the low-frequency pulsation (200 Hz) was applied to the liquid inlet, the peak of the exit pressure was close to the trough of the inlet mass flow rate. Meanwhile, the exit mass flow rate and pressure were approximately sinusoidal. There was no significant lag effect in the response of the exit mass flow rate to the inlet mass flow rate but with a small sawtooth-like oscillation. Increasing the amplitude of the liquid inlet disturbance amplified the exit mass flow rate fluctuation, which was greater than the set amplitude of the inlet pulsation. The dominant frequency of the injector exit mass flow rate and pressure variation was significantly less than the inlet pulsation frequency when the frequency of the liquid inlet pulsation was increased to 1000 Hz. This was due to the low-pass filtering effect of the annular slit. There was no significant change in the overall spray morphology for the gas inlet pulsation. By applying the same amplitude and frequency of pulsation to the gas and liquid inlets of the injector, the pulsation of the liquid inlet had a stronger effect on the injector exit spray than that of the gas inlet.