自振脉冲气液射流振动分析

唐川林; 胡东; 张凤华; 蔡书鹏

doi:10.6052/0459-1879-12-239

自振脉冲气液射流振动分析

doi: 10.6052/0459-1879-12-239

湖南工业大学现代水射流研究所, 株洲 412008

基金项目: 湖南省科技计划项目(2013SK3165); 湖南省自然科学基金项目(13JJ9013)和湖南省教育厅科研项目(12C0066)资助.

详细信息

通讯作者:
胡东,讲师,主要研究方向:高压水射流、流体机械.E-mail:hudong_9@126.com

中图分类号: TP69
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出版历程
- 收稿日期: 2012-09-03
- 修回日期: 2013-03-03
- 刊出日期: 2013-07-18

VIBRATION ANALYSIS OF THE SELF-EXCITED OSCILLATION PULSED AIR-WATER JET

Modern Jetting Department of Hunan University of Technology, Zhuzhou 412008, China

Funds: The project was supported by the Projects of Hunan province science and Technology Department(2013SK3165), the Natural Science Foundation of Hunan Province (13JJ9013) and Nature Science Foundation of the Education Department of Hunan Province (12C0066).

摘要

摘要: 从提高射流利用率出发, 在自振脉冲水射流喷嘴振荡腔上开孔自吸入空气, 以形成一种自振脉冲气液射流, 研究其振荡频率以及打击力的实际影响因素.基于水声学与流体动力学原理建立自振脉冲气液射流频率模型, 并以悬臂梁为靶物, 通过考察射流冲击悬臂梁时的振动特性获得其时域及频域特征.结果表明, 自振脉冲气液射流的振荡频率随腔长增加单调递减, 随含气率变化存在极小值, 且在初始段发生骤变, 实测值与理论值相吻合;对应自振脉冲气液射流产生最大谐振峰值的最优腔长略小于自振脉冲水射流, 且前者最大谐振峰值较后者明显提高.
- 自振脉冲气液射流 /
- 腔长 /
- 含气率 /
- 振荡频率 /
- 峰值
Abstract: Aiming at improving the utilization ratio of jet, the self-excited oscillation pulsed air-water jet is generated by entraining air into the chamber of a self-excited oscillation pulsed water jet nozzle. The present studies focus on the actual influencing factors of oscillation frequency and hitting power of jet. Based on the theory of hydro-acoustics and fluid dynamics, a theory model which describes frequency characteristic of the self-excited oscillation pulsed air-water jet is presented. Moreover, the time domain and frequency domain characteristics of jet can be obtained by testing the vibration of cantilever beam with equalized strength caused by the jet impinging. The calculation result of the model show that the oscillation frequency of self-excited oscillation pulsed air-water jet monotonously decreases with increasing the cavity length, the relation between frequency and air hold-up is not always decreasing monotonously, but begins to go up after the minimal value. However, the sudden change of the model curve occurs at a given very low air hold-up. The theoretical result is confirmed well by experiment; it is also found that the optimal chamber length corresponding to the maximum resonance peak of the self-excited oscillation pulsed air-water jet is slightly smaller than that of the self-excited oscillation pulsed water jet, and the maximum resonance peak of the former is much higher than that of the latter.
- self-excited oscillation pulsed air-water jet /
- cavity length /
- air hold-up /
- oscillation frequency /
- peak value

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参考文献(15)

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