水平管气液两相流涡街的动力学特性分析  

Analysis on Dynamics Characteristics of Vortex-Street in Horizontal Gas-Liquid Two-Phase Flow

作　　者：孙宏军[1] 何星[1] 徐冠群[1] 李金霞[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《测控技术》2015年第4期120-123,共4页Measurement & Control Technology

基　　金：国家自然科学基金青年基金项目(50906061)

摘　　要：针对水平管气液两相流涡街信号,采用HHT方法对其进行分解,得到信号各固有模态分量IMF,并对其进行傅里叶变换,计算各IMF的能量大小及所占比例来区分涡街信号成份。提出了以涡街信号所占能量比达到60%作为判断涡街脱落稳定的标准。实验结果表明,利用HHT方法对气液两相流钝体绕流信号进行分解,并通过所得IMF的能量比能有效地对涡街脱落的稳定性进行判别。最后分析了不同流动状况下流体绕钝体流动的机理及其动力学特性的区别。By using HHT method,the vortex-street signal of gas-liquid two-phase flow in horizontal pipeline is decomposed to obtain each intrinsic mode function component IMF.After Fourier transformation,the energy and proportion of each IMF can be calculated to distinguish the vortex-street signal component.It is proposed that when the energy proportion of the vortex-street signal exceeds 60%,the vortex-street is stable.Experimental results show that by using HHT method to decompose signals of gas-liquid two-phase flow around a bluff body,the stability of vortex-street could be discriminated effectively by calculating each IMF＇ s energy proportion.The mechanism and dynamics characteristics of two phase flow around a blunt body under different flow conditions are analyzed finally.

关 键 词：HHT IMF 能量比 稳定性 动力学特性 

分 类 号：O359.1[理学—流体力学]