摘要
建立了自激振荡雾化喷嘴的物理模型以及数学模型,通过Fluent软件对自激振荡腔室内部流场进行模拟,分析了自激振荡射流扰动波频率与喷嘴固有频率之间的关系、振荡腔室脉冲发生原因,以及射流脉冲特性其对雾化的影响,解释了自激振荡脉冲射流的雾化机理,说明了自激振荡喷嘴能明显提高射流的雾化效果.数值模拟了不同腔长配比和不同出流扩张锥角.结果表明,在其它条件一定的情况下最佳腔长配比值为腔长与上喷嘴直径之比为2.4,最佳出流扩张锥角为（60～65）°.
The Physical models and mathematical models have been built, the relationship between the frequency of disturbance wave and the natural frequeney of the nozzle and the causes of pulse in oscillation chamber have been analyzed as well as its impact on the atomization by simulating the self-ascillating flow field inside the chamber by Fluent, and the atomization mechanism of self-excited oscillation pulsed jet has been explained here. Above this, it indicates that the self- oscillation nozzle can significantly improve the jet atomization. Flow field by different cavity length ratio and the different expansion cone angle have been simulated. In the case of certain other conditions, it shows the optimum value is that the ratio of cavity length to the nozzle diameter is 2.4, and the optimum cone angle of the expansion of the flow is（ 60-65 ）°.
出处
《机械设计与制造》
北大核心
2014年第4期212-214,共3页
Machinery Design & Manufacture
基金
中国博士后科学基金面上项目(2011M501250)
高等学校博士学科点专项科研基金(20124219120001)
湖北省科学技术研究计划优秀中青年人才项目(Q20111108)
关键词
自激振荡
雾化
脉冲射流
数值模拟
Self-Excited Oscillation
Atomization
Pulsed Jet
Numerical Simulation
