Vacuum and energy separation characteristics of tornado-like vortices
QI Haiying1, HUANG Xingliang1, HU Yu1, LI Ke2, SUN Xinyu1, WANG Zhipeng1
1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;
2. School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China
Abstract：A series of Ranque-Hilsch-effect-based vortex generators were designed for cold-state flow tests of tornado-like vortices. Flow visualizations and measurements show that the opposing effects of vacuum abstraction and centrifugal expansion are both derived from the intensive swirling which leads to small jet angles and less aerodynamic leaks than in a normal swirling jet. The vortex provides a slip and shielding effect to the environment, a high vacuum region in the center of the vortex and an inhomogeneous volcano-like velocity distribution with exponential attenuation of the vacuum in the axial direction. Energy separation accuses which is closely related to the local vacuum and flow direction. A high inlet pressure and vacuum are crucial to the vortex generation and the proportion of the energy conversion from pressure to swirling kinetic energy increases with increased pressure, which can be used to optimize the generator structure. The tornado-like vortex generation mechanism can be used to study the interaction between the vortex and combustion in the vortex.
祁海鹰, 黄兴亮, 胡羽, 李科, 孙新玉, 王志鹏. 龙卷旋涡的真空与能量分离特性研究[J]. 清华大学学报（自然科学版）, 2016, 56(8): 893-900,907.
QI Haiying, HUANG Xingliang, HU Yu, LI Ke, SUN Xinyu, WANG Zhipeng. Vacuum and energy separation characteristics of tornado-like vortices. Journal of Tsinghua University(Science and Technology), 2016, 56(8): 893-900,907.
[1] 张景松.人造龙卷风形成机理[J].煤炭学报,1996,21(4):403-406.ZHANG Jingsong.Mechanism for generation of artificial tornado[J].Journal of China Coal Society,1996,21(4):403-406.(in Chinese)
[2] Shtern V,Borissov A,Hussain F.Temperature distribution in swirling jet[J].International Journal of Heat and Mass Transfer,1998,41(16):2455-2467.
[3] Bach T V,Gouldin F C.Flow measurement in a model swirl combustor[J].AIAA Journal,1982,20(5):642-651.
[4] 沈忠厚.水射流理论与技术[M].北京:石油大学出版社,1998.SHEN Zhonghou.Water Jet Theory and Technology[M].Beijing:China University of Petroleum Press,1998.(in Chinese)
[5] 高歌.航空发动机气动热力国防科技重点实验室内部报告[R].北京:航空发动机气动热力国防科技重点实验室,2009.GAO Ge.National Key Laboratory of Science and Technology on Aero-engines,BUAA,Internal Report[R].Beijing:National Key Laboratory of Science and Technology on Aero-engines,BUAA,2009.(in Chinese)
[6] 李志强.航空发动机气动热力国防科技重点实验室内部报告[R].北京:航空发动机气动热力国防科技重点实验室,2009.LI Zhiqiang.National Key Laboratory of Science and Technology on Aero-engines,BUAA,Internal Report[R].Beijing:National Key Laboratory of Science and Technology on Aero-engines,BUAA,2009.(in Chinese)
[7] 贾红书,吴玉庭,马重芳,等.喷嘴马赫数对涡流管性能影响的实验[J].航空动力学报,2009,24(6):1275-1278.JIA Hongshu,WU Yuting,MA Chongfang,et al.Experimental study on the vortex tubes with different mach number nozzles[J].Journal of Aerospace Power,2009,24(6):1275-1278.(in Chinese)
[8] 曹勇,吴剑锋,罗二仓,等.涡流管研究的进展与评述[J].低温工程,2001,124(6):1-5.CAO Yong,WU Jianfeng,LUO Ercang,et al.Evolution and evaluation of research in vortex tube[J].Gryogenics,2001,124(6):1-5.(in Chinese)
[9] 周少伟.涡流管能量分离效应的理论与试验研究[D].哈尔滨:哈尔滨工程大学,2007.ZHOU Shaowei.Theoretical and Experimentl Investigations into Energy Separation Effect of Vortex Tubes[D].Harbin:Harbin Engineering University,2007.(in Chinese)
[10] Eiamsaard S.Experimental investigation of energy separation in a counter-flow Ranque-Hilsch vortex tube with multiple inlet snail entries[J].International Communications in Heat and Mass Transfer,2010,37(6):637-643.
[11] Hamdan M O,Alawar A,Elnajjar E,et al.Experimental analysis on vortex tube energy separation performance[J].Heat and Mass Transfer,2011,47(12):1637-1642.
[12] Shtern V,Borissov A,Hussain F.Temperature distribution in swirling jet[J].International Journal of Heat and Mass Transfer,1998,41(16):2455-2467.
[13] 李科,胡羽,黄兴亮,等.龙卷旋涡的大涡模拟及能量分离机理[J].燃烧科学与技术,2016,22(3):198-205.LI Ke,HU Yu,HUANG Xingliang,et al.Tornado-like vortex flow and its mechanism of energy separation by large-eddy simulation[J].Journal of Combustion Science and Technology,2016,22(3):198-205.(in Chinese)
[14] 张永良.离心喷嘴雾化特性实验研究和数值模拟[D].北京:中国科学院工程热物理研究所,2013.ZHANG Yongliang.Experiment and Numerical Studies on the Atomization of a Pressure Atomizer[D].Beijing:Institute of Engineering Thermophysics,Chinese Academy of Sciences,2013.(in Chinese)
2016, Vol. 56 
