不同壅塞管直径壅塞空化器的数值研究

张凤华; 徐俊超; 苏新; 李念; 唐川林

doi:10.13433/j.cnki.1003-8728.2015.0127

不同壅塞管直径壅塞空化器的数值研究

doi: 10.13433/j.cnki.1003-8728.2015.0127

1.
湖南工业大学机械工程学院, 株洲 412007

基金项目:

湖南省自然科学基金项目（2015JJ5014）资助

详细信息

作者简介:
张凤华（1960-），教授，博士，研究方向为高效射流理论与应用，fenghua387@126.com

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出版历程
- 收稿日期: 2013-05-31
- 刊出日期: 2015-01-05

Numerical Simulation on Choking-cavitator Having Different Diameters of Choke Pipe

1.
Mechanical Engineering Institute, Hunan University of Technology, Zhuzhou 412007

摘要

摘要: 研究了7种不同壅塞管直径和背压对壅塞空化器空化效果的影响。结果表明：不同壅塞管直径的壅塞空化器在背压小于或等于临界压力值时出现壅塞流动现象，此时，壅塞截面上游壅塞管轴心线上的压力、气体体积分数、马赫数都不会受背压影响；当壅塞管中形成混合较均匀的气液两相流时，从壅塞管中段至壅塞截面气液两相流动的马赫数逐渐增加，在压力梯度最高点最大值为0.98；不同壅塞管直径的壅塞空化器要产生强烈的空化都有最佳的背压范围，随着壅塞管直径的增大，最佳的背压范围会逐渐缩小；在壅塞流动的条件下，增大背压或壅塞管直径，最大压力梯度值会增大，壅塞截面会向上游移动。
- 空化 /
- 壅塞 /
- 壅塞管 /
- 背压 /
- 壅塞空化器
Abstract: Under the different back-pressure, seven kinds of choking-cavitator with different choke pipe diameters is simulated by using the computational fluid dynamics software FLUENT, the effects of the choke pipe diameters and the back-pressure on the cavitation strength of the chocking-cavitator are studied. The results showed that the choking flow phenomena will appear in choking-cavitator having sifferent choke pipe diameters when the back-pressure was less than or equal to the value of the critical pressure. It is found that the characteristic parameters,such as pressure, volume fraction of air and Mach number, on the axis of choke pipe in the choked section upstream are not affected by the back pressure. When the homogenous gas-liquid two-phase flow was formed in the choke pipe, it is also found that the Mach number of the gas-liquid two-phase flow increase gradually from the middle section to the choked section of the choke pipe and reach the maximum value of 0.98, very closed to 1, at the maximum pressure gradient. There exist the best ranges of back-pressure to produce the strong choking cavitation for the choking-cavitator having different diameters of choke pipe. As the choke pipe diameter is increased, the best range of back pressure gradually is reduced. Increasing the choke pipe diameter or back-pressure under the choked flow conditions, the maximum pressure gradient will be also increased and the choked section will move to the choke pipe upstream.
- back-pressure /
- cavitation /
- choke /
- choking-cavitator /
- computational fluid dynamics

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参考文献(16)

[1]	Gogate P R. Cavitation: an auxiliary technique in wastewater treatment schemes[J]. Advances in Environmental Research,2002,(6):335-358
[2]	王金刚,郭培全.空化效应在有机废水处理中的应用研究[J].化学进展,2005,(3):549-553 Wang J G, Guo P J. Research status of degradation and application of cavitation in organic wastewater treatment[J]. Progress in Chemistry,2005,(3):549-553 (in Chinese)
[3]	Kalumuck K M, Chahine G L. The use of cavitating jets to oxidize organic compounds in water[J]. Journal of Fluids Engineering-transactions of the ASME,2000,(3):465-470
[4]	魏群,肖波.水力空化技术在废水处理中的研究与应用进展[J].中国给水排水,2007,23(2):13-16 Wei Q, Xiao B. Progress in research and application of hydrodynam ic cavitation technology in wastewater treatment[J]. China Water & Waste Water,2007,23(2):13-16 (in Chinese)
[5]	葛强,李晓红,卢义玉等.空化射流处理有机废水的机理[J].重庆大学学报,2007,30(5):11-23 Ge Q, Li X H, Lu Y Y, et al. Mchanism of oganic wstewater teatment by cavitating jets[J]. Journal of Chongqing University,2007,30(5):11-23 (in Chinese)
[6]	朱孟府,曾艳,邓橙,等.水力空化在水处理中的应用与研究进展[J].环境科学与技术,2010,33(12F):445-449 Zhu M F, Zeng Y, Deng C, et al. Application and research of hydrodynamic cavitation technology in water treatment field[J]. Environmental Science & Technology,2010,33(12F):445-449 (in Chinese)
[7]	Gogate P R. Hydrodynamic cavitation for food and water processing[J]. Food Bioprocess Technol,2011,4:996-1011
[8]	Amin L P, Gogate P R, Burgess A E. Optimization of a hydrodynamic cavitation reactor using salicylic acid dosimetry[J]. Chemical Engineering Journal,2010,156(1)
[9]	Mezule L, Tsyfansky S, Yakushevich V, et al. A simple technique for water disinfection with hydrodynamic cavitation: effect on survival of escherichia coli[J]. Desalination, 2010, 251: 152-159
[10]	张凤华,刘海峰,徐俊超,等.壅塞空化与射流空化噪声谱特性的实验研究[J].湖南工业大学学报,2011,25(6):47-50 Zhang F H, Liu H F, Xu J C, et al. Experimental investigation on the noise spectrum features of choking-cavitation and jet-cavitation[J]. Journal of Hunan University of Technology,2011,25(6):47-50 (in Chinese)
[11]	张凤华,徐俊超,刘海峰,等.壅塞空化器设计及处理污水的可行性研究[J].湖南工业大学学报,2012,26(4):30-36 Zhang F H, Xu J C, Liu H F, et al. The choking cavitator design and its feasibility study ofwastewater treatment[J]. Journal of Hunan University of Technology,2012,26(4):30-36 (in Chinese)
[12]	于蕾,李敏,林豹,等.FLUENT软件在射流模拟中的应用[J].科技情报开发与经济,2005,15(13):154-155 Yu L, Li M, Lin B, et al. Applicatons of FLUENT in the simulation of the fluid-flow [J]. Sci/tech Information Development & Economy,2005,15(13):154-155 (in Chinese)
[13]	龙新平,姚吴,赵建福.射流泵极限工况下空化流动[J].机械工程学报,2009,12:59-64 Long X P, Yao W, Zhao J F. Cavitating flow in jet pump under the operating limits[J]. Journal of Mechanical Engineering,2009,12:59-64 (in Chinese)
[14]	Brennen C E. Cavitation and bubble dynamics[M]. Oxford:Oxford University Press,1995
[15]	Brennen C E. Fundamentals of multiphase flows[M]. Cambridge:Cambridge University Press,2005
[16]	黄素逸,魏保太.汽液两相流动与传热[M].武汉:华中理工大学出版社,1988 Huang S Y, Wei B T. Vapor-liquid two-phase flow and heat transfer[M]. Wuhan:Huazhong University of Science and Technology Press,1988 (in Chinese)