Azimuthal Instabilities in Annular Chambers with Flow and Axial Distributed heat Source

摘要：

　　Instabilities of azimuthal modes appearing in annular combustion chambers of modern gas turbines are studied.The two methods based on mode-matching and linear Euler equation techniques are introduced.Different from traditional method to deal with azimuthal instabilities,the present work shows that boundary conditions of entropy and vorticity waves should be given besides impedance boundary conditions for acoustic waves when there is a flow.A good agreement is found between the results of the two methods.Emphasis is placed on the effect of the flow and the distributed heat source on the instabilities.It is found that the vorticity waves,which are often neglected in the analytical models of instabilities,play an important role in azimuthal instabilities in combustion chambers with a mean flow.

关键词： Azimuthal instability combustion instability vorticity wave annular chamber

作者: Lei Li Dan Zhao Xiaofeng Sun

作者单位: Division of Aerospace Engineering,College of Engineering,Nanyang Technological University,639798,Sin School of Jet Propulsion,Beijing University of Aeronautics and Astronautics,Beijing 100191,China

会议类型: 国际会议

会议名称: 2014 Asia-Pacific International Symposium on Aerospace Technology(2014亚太航空航天技术学术会议)

会议地点: 上海

会议语种:英文

页码: 1-11

在线出版日期: 2014-09-24（万方平台首次上网日期，不代表论文的发表时间）