航空发动机尾喷管固体颗粒流动特性研究

为了通过发动机尾喷管内固体颗粒的荷电水平来判断发动机的故障程度,对发动机尾喷管内固体颗粒的流动特性进行研究。选取某型发动机尾喷管为研究对象,利用ICEM软件进行建模与网格划分,通过Fluent模拟仿真分析颗粒直径和初始速度对颗粒分布的影响,探讨固相颗粒产生绳流、均匀弥散流、环流及层流等流型的条件。研究表明:局部注入的颗粒分布为绳流;对于面均匀注入方式,随着固体颗粒直径增大,其分布由均匀弥散流逐渐变为环流;随着颗粒直径和速度的增加,颗粒与尾喷管壁面碰撞加剧,部分区域出现层流;当颗粒直径和速度达到一定程度时,颗粒的分布规律保持稳定。

Study on Flow Characteristics of Solid Particles in Aeroengine Nozzle

In order to judge the engine fault situation by the static electricity level of solid particles in the engine nozzle,the flow characteristics of the solid particles were studied in the engine nozzle.A certain engine nozzle was selected as the research object,and ICEM software was used for modeling and grid generation.The influence of particle diameter and initial velocity on particle distribution was analyzed by Fluent simulation,and the conditions for solid particles to generate rope flow,uniform dispersion flow,circulation flow,laminar flow and other flow patterns were discussed.The results show that the particles distribution of locally injected is rope flow.For the surface injection mode,with the increase of solid particle diameter,the distribution of particle changes from uniform dispersion flow to circulation flow.With the increase of diameter and velocity of particle,the collision between particles and nozzle wall is intensified,and laminar flow appears in some regions.When the diameter and velocity of particle reach a certain degree,the distribution of particles remains stable.