环形喷管喷口气泡演化的实验研究

胡俊; 姜建玉; 于勇; 李婷婷

doi:10.6052/0459-1879-15-183

环形喷管喷口气泡演化的实验研究

doi: 10.6052/0459-1879-15-183

北京理工大学宇航学院, 飞行器动力学与控制教育部重点实验室, 北京 100081

基金项目: 国家自然科学基金资助项目(11372041).

详细信息

通讯作者:
胡俊,副教授,主要研究方向:流体力学、飞行器设计、微重力燃烧.E-mail:hujun@bit.edu.cn

中图分类号: O359+.1
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出版历程
- 收稿日期: 2015-05-20
- 修回日期: 2015-11-03
- 刊出日期: 2016-01-18

EXPERIMENTAL INVESTIGATION OF BUBBLE EVOLUTION ON ANNULAR NOZZLE

Key Laboratory of Dynamics and Control of Flight Vehicle, Ministry of Education, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 水下气泡的发展演化及气泡动力学行为是气液两相动力学的基础理论与水下射流应用的重要基础. 环形喷管/喷口形成的气泡及气体射流具有其不同于圆孔实心射流的特殊表现与规律机制,随着同心筒破水发射等特殊应用的出现,环形喷口气体射流/泡流的基础现象观测和机制分析成为迫切的需求. 基于环形喷管的设计和水下射流条件的分析,设计建立了一套环形喷管水箱实验系统,对水下环形喷管喷口气泡发展演化过程进行了初步的实验研究. 为观测研究气体通过环形喷管气泡生长发展过程,在较低压力、较低流速下,采用高速摄影仪记录气泡生长及发展演化过程. 结合对气泡发展演化过程的图像处理与分析,研究分析了环形喷口气泡形成区制、气泡生长过程形态发展特点、以及气泡形成时间及气泡体积变化特点. 研究表明:在本实验气体流量范围内(50.8~237.3 dm³/min),环形喷口气泡发展演化过程呈现较为明显的三周期区制,前泡尾流影响是环形气泡呈三周期区制的主要原因;不同周期内的气泡形成时间具有较稳定规律,并受到流量影响;气泡生长过程中有较为明显的下沉、回升特征;气泡表面张力、液体惯性与流动的共同作用,造成了典型的气泡顶部坍塌现象.
- 环形喷管 /
- 气泡形成 /
- 气泡形成区制 /
- 环形气泡 /
- 气泡坍塌
Abstract: The Evolution and dynamic behavior of bubble underwater is an important theory basis for the gas-liquid two-phase flow and application of underwater jet. The forming bubble and gas jet through annular nozzle have di erent performances and mechanism with bubble and jet generate through round hole. With the requirement of special application such as the concentric cylinder water piercing missile launching, observing the basic phenomena and mechanism analysis of the annular nozzle gas jet / bubble flow become an urgent need. A set of experimental system of the annular nozzle were designed and the evolution of bubbles through the annular nozzle was investigated. The visualization of bubble flow was realized by a high speed camera, which was used to record the bubble growth process. The bubble formation regimes, the influence of gas flow rate on bubble formation periods and bubble volume were studied based on the image processing and analysis of flow field.The experimental results indicate that: the regime of bubble formation is a period-3 bubbling under air flow rate from 50.8 dm³/min to 237.3 dm³/min; The variation of bubble formation periods and bubble volume with gas flow rate was given, which indicates that bubble formation periods and bubble volume are strongly dependent on the gas flow rate. Because of the cooperation of the surface tension, water inertia and liquid flow, top of the bubble will collapse downward during formation. It will lead to form an toroidal bubble.
- annular nozzle /
- bubble formation /
- regimes of bubble formation /
- toroidal bubble /
- bubble collapse

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