低压旋流喷嘴喷雾特性数值仿真及结果分析

Numerical simulation and results analyzing on low-pressure swirl nozzle spray characteristics

为了提高旋流喷嘴在低压下的雾化效果,对影响低压旋流式喷嘴的5个因素:旋流室直径D、旋流室高度H、喷嘴出口直径d、喷嘴出口长度l和旋流室入口数量n进行了研究。以正交试验方案确定了数值模拟的16组喷嘴结构参数组合。用Gambit进行了非结构网格划分,入口边界设为压力入口,p0=0.3 MPa,用fluent 6.3进行了仿真计算。对仿真结果运用正交试验的极差分析方法,获得了5个参数对喷嘴出口轴向速度和雾化角的影响程度排列顺序和最优参数组合。最后经过综合分析得到了4组优化的参数组合。研究结果表明,该研究为低压旋流喷嘴进一步的实验研究奠定了基础。

In order to improve the swirl nozzle atomization under low pressure, the five factors which affecting the low-pressure swirl nozzle atomization were investigated ,which were swirling chamber diameter D, swirling chamber height H, nozzle exit diameter d,nozzle exit length l and swirling entrance number ft. Sixteen groups of nozzle structural parameters were designed by the way of orthogonal experimental design. The ,unstructured mesh was gotten with Gambit,the inlet boundary conditions is pressure-inlet and the gauge total pressure is 0.3 MPa. the simulation was carried out with fluent6.3 software. The results of the simulation were analyzed through the range analysis method of orthogonal experiment and the order of the influence that the five factors have on the nozzle axial speed and the spray angle was obtained,the optimal parameters was also gotten through the simulation results analyzing. Finally,with the comprehensive analysis, four groups of optimal parameters were gained. The results show that the analysis lays the foundation for the further experimental study of the low-pressure swirl nozzle.