【作者】 董晓婷；

【导师】 王锁芳；

【作者基本信息】 南京航空航天大学 ， 动力机械及工程， 2009， 硕士

【摘要】 整体式惯性分离器是直升机发动机的一个必不可少的重要部件,安装在发动机前端,粒子分离器的发展能保证发动机安全可靠地工作并延长其使用寿命,因此掌握粒子分离器的分离效率和流场流动规律就显得极为重要。本文以有叶片整体式粒子分离器为研究对象,考虑了一定长度的进气道和预旋叶片的影响,对其分离效率和内部流场流动特性进行了数值计算研究。计算模型采用非结构化网格布置,使叶片间通道内的网格更为细密。利用FLUENT计算软件对其进行了三维气固两相流动的数值模拟,计算中采用标准k-ε模型和SIMPLE算法,具体研究了几何结构因素和气动因素对有叶片粒子分离器的性能影响。几何机构因素包括不同的预旋叶片数目、预旋叶片的预旋角度、变化位置和分流器变化位置,结果表明,随着预旋叶片数目的增加、旋转角度的增大,AC粗尘和C级砂的分离效率都随之增大,预旋叶片的安置位置对分离效率的影响呈抛物线形状,也就是说当预选叶片处于某一位置时,分离效率最高,分流器位置往-X方向和-Y方向变化时,分离效率提高。将有叶片粒子分离器IPS(Inertial Particle Separator)进行了整体三维数值模拟,得到了不同粒径的粒子的分离效率,AC粗尘和C级砂的分离效率,结果表明:随着粒径的增大,分离效率也随之增大;有了进气道和预旋叶片的影响,粒子受到气流的作用会增大,粒径较小的粒子容易被气流带入主气流流路,粒径较大的粒子因为气流对其影响,并且惯性也较大,从而进入清除流流路被分离出去。气动因素包括进气流量、扫气比和砂尘量对分离效率的影响,进气流量、扫气比和砂尘量均对分离效率有较明显的影响,分离效率随着进气流量、扫气比和砂尘量的增大而增大。本文的研究工作对有叶片整体式粒子分离器的设计和改进提供了设计依据和理论指导,为今后进一步开展相关研究工作提供了技术储备。更多还原

【Abstract】 Inertial particle separator (IPS) which is installed at the front of the engine is the indispensable and important part of the helicopter engine. The development of the IPS can guarantee the safe and reliable performance of engine and prolong its working time. It is very important to master the separation efficiency and the flow characteristics of IPS.The present paper deals with the numerical simulation about three-dimensional gas-solid two-phase flow thinking about the influence of the intake and swirling vanes in the inlet particle separator with vanes , with the aid of computer software—FLUENT. Numerical simulations were conducted to study the separation efficiency and the flow characteristics of IPS. The standard k ?εturbulence model and SIMPLE algorithm were applied in the paper to study the separation efficiency, pressure field, and the velocity field, under the influence of the geometry structure features and the aerodynamics structure.The geometry structure factors include the numbers, circumrotation angles, allocation of the swirling vanes and the allocation of the spliter. The results indicate that the separation efficiency of AC coarse dust and C-spec. sand increases when the number and angle of the swirling vanes increase. The influence curve of allocation of swirling vanes is a piece of parabola which means the separation efficiency is highest when the swirling vanes are a certain location. The separation efficiency increases when the spliter moves to the–X and–Y direction. The present paper deals with the numerical simulation about three-dimensional gas-solid two-phase flow. Separation efficiency is obtained for sands with different diameters. Separation efficiency of AC coarse dust and C-spec. sand are also obtained. The computations use standard k-εmode. The results show that Separation efficiency increases with the growth of particle size. Effects of flow on the particles enhance with the influence of intake and swirling vanes. The smaller particles are leaded easily into the engine because of the aerodynamic force of core flow. The larger particles are dominated by the inertial effects, so they are separated more from the streamlines. The separation efficiency increases when the inlet flux, the SCR (scavenging ratio) and the sand flux increase.The research work on this paper offers theoretical references for the improvement in design of inertial particle separator with vanes. The authentic experimental data lay a foundation for the further studies in the future as well.更多还原