可压缩旋转气体中超空化射流的热稳定性

吕明; 宁智; 阎凯

doi:10.6052/0459-1879-17-403

可压缩旋转气体中超空化射流的热稳定性

doi: 10.6052/0459-1879-17-403

吕明^1,2,
宁智^1,*, ,,
阎凯¹

1 北京交通大学机械与电子控制工程学院, 北京100044
2 中国汽车技术研究中心移动源污染排放控制技术国家工程实验室,天津300300

基金项目: 国家自然科学基金(51606006, 51776016), 北京市自然科学基金 (3172025, 3182030)和移动源污染排放控制技术国家工程实验室开放基金(NELMS2017A10)资助项目.

详细信息

作者简介:
通讯作者:宁智,教授,主要研究方向：流体力学, 内燃机排放与污染控制. E-mail:zhining@bjtu.edu.cn

通讯作者:
宁智

中图分类号: O359;
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出版历程
- 收稿日期: 2017-12-05
- 刊出日期: 2018-05-18

THERMAL STABILITY OF SUPERCAVITATING JET IN A COMPRESSIBLE ROTARY GAS

Lü Ming^1,2,
Ning Zhi^{1,*
, ,},
Yan Kai¹

1 School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044,China
2 National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center, Tianjin 300300, China;

摘要

摘要: 液体射流热稳定性研究是对射流稳定性问题的更深层次的探讨,可以进一步加深对液体射流分裂与雾化机理的认识,具有重要的学术意义和工程应用价值. 基于射流稳定性理论,在同时考虑射流周围气体旋转、射流和周围气体可压缩性以及射流液体中含空化气泡的条件下,建立了描述可压缩旋转气体中超空化射流热稳定性的数学模型,并对数学模型及其求解方法进行了验证分析;在此基础上,分析了液体射流表面与周围气体间温差及射流内部温度梯度同时作用下对射流稳定性的影响;并进一步探讨了超空化射流的热稳定性. 结果表明,射流表面扰动波的最大扰动增长率、最不稳定频率以及最大扰动波数皆随气液温差的增大呈近似线性增大趋势;射流内部温度梯度的存在使得气液温差对射流的失稳作用更加显著;射流内部温度梯度会抑制超空化对射流稳定性的影响,但气液温差会在一定程度上促进超空化对射流的失稳作用.
- 射流 /
- 温差 /
- 温度梯度 /
- 可压缩 /
- 超空化
Abstract: Thermal stability of liquid jet is the deeper discussion to jet stability, which can improve our understanding to the mechanism of breakup and atomization of liquid jet. Also, Study on the thermal stability of liquid jet has an important value in theory and engineering. Based on the jet stability theory, under the conditions of gas rotation, fluids compressibility and supercavitation, this paper gives the mathematical model describing the thermal stability of supercavitating jet in a compressible rotary gas, and the corresponding numerical method for solving the mathematical model is proposed and verified by the data in reference. Then, this paper analyzes the effects of gas-liquid temperature differences and temperature gradients on jet instability, and studies the thermal stability of supercavitating jet. The results show that the maximum disturbance growth rate, the dominant frequency and the maximum disturbance wave numbers increase linearly with the increasing of gas-liquid temperature differences. The existence of temperature gradient inside the jet makes the instability effects of temperature differences on jet more obvious. The temperature gradients will inhibit the effects of supercavitation on jet instability, while gas-liquid temperature differences will promote the effects of supercavitation on jet instability.
- jet /
- temperature difference /
- temperature gradient /
- compressibility /
- supercavitation

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