摘要
分析了自激脉冲喷嘴的工作原理和自激振荡产生的机理,建立了自激喷嘴的数学模型;利用Fluent仿真软件,研究不同结构参数喷嘴的脉冲射流特性;通过模拟仿真分析,得出了喷嘴的最佳结构参数。结果表明:上、下喷嘴直径和腔长对出流频率、振幅以及流速峰值都有着较为关键的影响;由于涡旋和空化对入口流速的阻碍,以及气体体积分数的不同,出口流速比进口流速大。
The researches on shock pulse nozzle mainly focus on the single cavity dynamic characteristics at home and abroad,and the studies on its structure parameters are less. The work principle of the self excited pulse nozzle and the mechanism of its self-excited oscillation are analyzed in this paper,and the mathematical model of the self excited nozzle is established. Using the Fluent software,the different structure parameters of pulse jet nozzle characteristic are studied. Through the simulation analysis,the optimal structural parameters of self excited pulse nozzle are obtained. The results show that upper and lower nozzle diameter and cavity diameter have significant influence on the frequency,amplitude and the peak value of flow velocity. Due to the obstacles induced by vortex and cavitation on the inlet velocity and the difference of gas volume fraction,the flow velocity of inlet is bigger than that of the outlet.
出处
《机械科学与技术》
CSCD
北大核心
2014年第6期901-904,共4页
Mechanical Science and Technology for Aerospace Engineering
基金
陕西省重点学科建设专项基金项目(102-00x903)资助
关键词
自激脉冲
喷嘴
结构参数
数值计算
calculations
cavitation
computational fluid dynamics
computer simulation
computer software
flow fields
mathematical models
mesh generation
nozzles
numerical calculation
optimization
self excitation pulse
structural parameters
uncertainty analysis
velocity
volume fraction
vortex flow
