一种旋流式喷嘴的实验和数值研究

Experimental and numerical investigation of a swirl atomizer

关键词:  喷嘴  雾化  二相流  数值计算  实验

Key words:  Injector  Two phase flow  Atomization  Numerical calculation  Experimentation

摘要:

对一种小尺寸复杂结构的旋流式喷嘴进行了实验和数值研究。实验研究中确定了喷嘴前后压差与流量间的对应关系。数值研究中应用VOF方法对喷嘴内三维气液两相流动进行了计算 ,并与实验结果做了比较 ,二者吻合较好。而后应用该算法对喷嘴在不同结构尺寸下的流动过程进行了计算 ,对比分析后发现 :旋流室及旋流器的结构和尺寸均会对喷嘴出口速度产生影响 ,但只有旋流器螺旋升角和槽道数目才会对喷嘴雾化角产生显著影响

Abstract:

Experimental and numerical study on a small swirl atomizer with complex structure was conducted. In the experimental research, the relationship between pressure difference of atomizer and mass flow rate was decided. In numerical research, 3 D gas liquid flow in the atomizer was calculated employing VOF method, which was validated by the experimental data with good agreement each other. Then, with this methodology, flow process in the atomizer with different structure and dimension was simulated. After analysis about these numerical results, it was found that: the atomizer exit velocity can be affected by both the structure and dimension of swirl chamber and swirler, and the atomization angle mainly decided by the screw rise angle and the number of the swirler grooves.