喷口速度扰动下液体射流的频率响应

周程林; 邹建锋; 张阳; 叶麟

doi:10.13224/j.cnki.jasp.20210234

喷口速度扰动下液体射流的频率响应

doi: 10.13224/j.cnki.jasp.20210234

周程林¹,
邹建锋^1, ,,
张阳¹,
叶麟²

1.
浙江大学航空航天学院，杭州 310027
2.
正泰集团股份有限公司数字化技术研究院数字化解决方案部，杭州 310052

基金项目: 国家自然科学基金（11372276，11432013，11272285）

详细信息

作者简介:
周程林（1996-），男，博士生，主要从事液体燃料射流数值模拟研究。

通讯作者:
邹建锋（1977-），男，副教授、博士生导师，博士，主要从事先湍流燃烧数值模拟技术开发及燃料雾化机理研究。E-mail：zoujianfeng@zju.edu.cn

中图分类号: V231.2
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出版历程
- 收稿日期: 2021-05-12
- 刊出日期: 2022-04-28

Frequency response of liquid jet under nozzle velocity disturbance

1.
School of Aeronautics and Astronautics，Zhejiang University，Hangzhou 310027，China
2.
Digital Technology Research Institute， CHINT Group Corporation，Hangzhou 310052，China

摘要

摘要: 基于界面捕捉VOF（volume of fluid）方法和网格自适应技术，对圆射流初始破碎过程进行了直接数值模拟，揭示了不同扰动频率对圆射流表面形态和液丝、液滴结构的响应特性。研究结果表明：Rayleigh线性化色散理论可以很好地对当前射流表面波的失稳过程进行解释。当喷口扰动频率（66.6 kHz）小于理论临界值95.5 kHz时，射流会随着时空演化逐渐失稳，而当大于临界值时，表面波振幅会逐渐减弱并逐渐变成光滑状态。表面波不稳定状态下脱落液滴会撞击波节结构，在其表面留在冲击凹痕；随着波节振幅不断增大，液膜发生穿孔式破裂，进而形成大量脱落的液丝和液滴结构。适当频率的扰动可以减少射流头部的速度波动，从而减缓射流的雾化进程；射流表面波的破碎和液核头部的破碎过程共同决定了喷雾场SMD（Sauter mean diameter）的大小，且两者存在相互耦合。
- 频率响应特性 /
- 圆射流 /
- 速度扰动 /
- VOF方法 /
- 表面形态 /
- 液丝 /
- 液滴
Abstract: Based on the VOF （volume of fluid） interface capture method and the dynamic adaptive grid technique，a direct numerical simulation of the breakup process of a circular jet was carried out.The surface morphology of the circular jet and the response characteristics of liquid ligaments and droplets under different disturbance frequencies were revealed.The results showed that Rayleigh linearized dispersion theory can well explain the instability process of jet surface wave.When the nozzle disturbance frequency （66.6 kHz） was less than the theoretical critical value of 95.5 kHz，the jet gradually lost stability with the evolution of time and space.When it was greater than the critical value，the amplitude of surface wave gradually weakened and the liquid core became smooth.When the surface wave was unstable，the falling droplets impacted the nodal structure and impact dents left on its surface；with the increase of nodal amplitude，the liquid film broke through，and then a large number of detached liquid ligaments and droplets were formed.Appropriate frequency disturbance can reduce the velocity fluctuation of the jet head and slow down the atomization process of the jet.The breakup of the jet surface wave and the breakup process of the liquid core head determined the size of the SMD （Sauter mean diameter） of spray field，and there existed mutual coupling between them.
- frequency response characteristics /
- circular jet /
- velocity disturbance /
- VOF method /
- surface morphology /
- liquid ligament /
- droplet

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