隔板应用于发动机燃烧室不稳定燃烧抑制中的二维数值计算分析  

Two-dimensional Numerical Analysis of Applying Baffles to Restraining the Combustion Instability in a Marine Engine

作　　者：樊晓波[1] 王敏庆[1] 盛美萍[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《机械科学与技术》2007年第9期1118-1121,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(10574105);全国优秀博士学位论文基金项目(200451)资助

摘　　要：针对某水下航行器的燃烧室,用有限元的方法对隔板抑制燃烧不稳定性的声学机理进行了初步研究。利用ANSYS软件数值计算了隔板长度变化以及隔板数目变化时,对应的燃烧室声模态,并比较了它们的变化对燃烧室声模态造成的影响。计算表明:隔板抑制燃烧不稳定主要是通过对燃烧室腔体的声学共振频率进行平移,避开了与其相耦合的频率,从而达到抑制燃烧不稳定的目的。同时随着隔板长度的增加,靠近隔板处的声腔部分的切向声模态轴向化会逐步加剧,这样就可以得到更好的抑制作用。Using finite element method （ FEM）, we studied the acoustic mechanism of restraining the combustion in stability with baffles in the combustion chamber of a marine engine. Acoustic modes of the combustion chamber were calculated with FEM software ANSYS when the length and number of baffles change, and the influences of the changes on the acoustic modes are compared. Calculation results show that the restraining of combustion instability by baffles is mainly through the modification of the oscillation frequency of the combustion chamber so that it is not coupled with the combustion process of the propellant, and that increasing the length of the baffle will improve the restraining effect.

关 键 词：发动机燃烧室 隔板 燃烧不稳定性 声模态 有限元 

分 类 号：O422[理学—声学] TB115[理学—物理]