基于自激振荡脉冲效应的雾化喷嘴出口流道空化特性研究
发布时间：2018-10-09 18:08
【摘要】：喷嘴结构及射流运动参数对液体空化流动状态有重要影响。基于空化泡溃灭的雾化机理和自激振荡脉冲喷嘴出口流道空化过程,分析空化效应对自激振荡脉冲射流雾化效果的影响。依据自激振荡脉冲雾化喷嘴结构,分析射流来流速度和脉动压力对喷嘴出口流道空化效应的影响,提出利用来流雷诺数和脉动特征值表征喷嘴出口流道空化程度,并根据自激振荡脉冲喷嘴有限元分析得到喷嘴出口流道较好空化状态的来流雷诺数和喷嘴腔室长径比。研究结果表明:当来流雷诺数在2.14×10~5~3.05×10~5内逐渐增大时,自激振荡脉冲雾化喷嘴出口流道液相体积分数先减小后增大,相应的空化程度先增大后减小。雷诺数在2.44×10~5~2.75×10~5内可以使喷嘴出口流道形成较好空化效应,尤其在2.44×10~5附近时喷嘴出口流道出现最好的空化状态;脉动特征值与喷嘴出口流道处脉动压力幅值差成正比,随着自激振荡脉冲雾化喷嘴腔室长径比增大,脉动压力幅值差值先减小后增大。当喷嘴腔室长径比为0.60~0.70时,喷嘴出口流道空化状态较好。计算结果为自激振荡脉冲射流雾化喷嘴设计提供了理论依据。
[Abstract]:The nozzle structure and jet motion parameters have an important influence on the cavitation flow state of liquid. Based on the atomization mechanism of cavitation bubble collapse and the cavitation process of the exit channel of self-excited oscillating pulse nozzle, the influence of cavitation effect on the atomization effect of self-excited oscillating pulse jet is analyzed. According to the structure of self-excited oscillating pulse atomization nozzle, the influence of jet flow velocity and pulsating pressure on the cavitation effect of nozzle outlet channel is analyzed, and the cavitation degree of nozzle outlet channel is characterized by Reynolds number and pulsating characteristic value. According to the finite element analysis of the self-excited oscillating pulse nozzle, the flow Reynolds number and the ratio of length to diameter of the nozzle chamber in the cavitation state of the nozzle outlet are obtained. The results show that when the flow Reynolds number increases gradually in the range of 2.14 脳 10 ~ (5) ~ 5 ~ 3.05 脳 10 ~ (-5), the liquid phase volume fraction at the outlet of the self-excited oscillating pulse atomizing nozzle decreases first and then increases, and the corresponding cavitation degree increases first and then decreases. When the Reynolds number is 2.44 脳 10 ~ (5) ~ (5) ~ 2.75 脳 10 ~ (5) 脳 10 ~ (-5), the cavitation effect can be formed at the nozzle outlet, especially when the nozzle exit is near 2.44 脳 10 ~ (5), and the pulsation characteristic value is proportional to the pulse pressure amplitude at the nozzle outlet. The amplitude difference of pulsating pressure decreases first and then increases with the increase of the ratio of length to diameter of the chamber of self-excited oscillation pulse atomizing nozzle. When the ratio of length to diameter of nozzle chamber is 0.60 ~ 0.70, the cavitation condition of nozzle outlet is better. The calculated results provide a theoretical basis for the design of self-oscillating pulsed jet atomizing nozzle.
【作者单位】： 武汉科技大学冶金装备及其控制教育部重点实验室;重庆大学机械工程学院;
【基金】：国家自然科学基金资助项目(51405352,51376204)
【分类号】：O358
本文编号：2260276
[Abstract]:The nozzle structure and jet motion parameters have an important influence on the cavitation flow state of liquid. Based on the atomization mechanism of cavitation bubble collapse and the cavitation process of the exit channel of self-excited oscillating pulse nozzle, the influence of cavitation effect on the atomization effect of self-excited oscillating pulse jet is analyzed. According to the structure of self-excited oscillating pulse atomization nozzle, the influence of jet flow velocity and pulsating pressure on the cavitation effect of nozzle outlet channel is analyzed, and the cavitation degree of nozzle outlet channel is characterized by Reynolds number and pulsating characteristic value. According to the finite element analysis of the self-excited oscillating pulse nozzle, the flow Reynolds number and the ratio of length to diameter of the nozzle chamber in the cavitation state of the nozzle outlet are obtained. The results show that when the flow Reynolds number increases gradually in the range of 2.14 脳 10 ~ (5) ~ 5 ~ 3.05 脳 10 ~ (-5), the liquid phase volume fraction at the outlet of the self-excited oscillating pulse atomizing nozzle decreases first and then increases, and the corresponding cavitation degree increases first and then decreases. When the Reynolds number is 2.44 脳 10 ~ (5) ~ (5) ~ 2.75 脳 10 ~ (5) 脳 10 ~ (-5), the cavitation effect can be formed at the nozzle outlet, especially when the nozzle exit is near 2.44 脳 10 ~ (5), and the pulsation characteristic value is proportional to the pulse pressure amplitude at the nozzle outlet. The amplitude difference of pulsating pressure decreases first and then increases with the increase of the ratio of length to diameter of the chamber of self-excited oscillation pulse atomizing nozzle. When the ratio of length to diameter of nozzle chamber is 0.60 ~ 0.70, the cavitation condition of nozzle outlet is better. The calculated results provide a theoretical basis for the design of self-oscillating pulsed jet atomizing nozzle.
【作者单位】： 武汉科技大学冶金装备及其控制教育部重点实验室;重庆大学机械工程学院;
【基金】：国家自然科学基金资助项目(51405352,51376204)
【分类号】：O358
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