长尾喷管故障诊断中的两相流动计算

为了给长尾喷管故障诊断提供理论依据并提供改进措施,利用颗粒轨道模型和有限体积的Jameson格式计算了长尾喷管两相流流场,得到了流场中温度和马赫数的分布和不同燃烧室总压下不同尺寸的粒子对喷管壁面的撞击情况,结果表明大尺寸粒子对直管段壁面的撞击位置存在一个集中点,这是造成喷管烧穿的重要原因。得出了总压越高粒子撞击壁面的次数越多、尺寸越大粒子撞击壁面的次数越多的结论,给出了提高长尾喷管热防护结构可靠性的一些措施。 

Numerical Study of Two-Phase Flow for Fault Diagnosis in a Tail-Pipe Nozzle

In order to provide analysis results for fault diagnosis in a tail pipe nozzle to make some suggestions,two phase flow field is studied for a tail pipe nozzle by using the trajectory model and finite volume method to obtain the gas temperature and Mach number distributions,and to simulate the collision between the wall and different size particles under different total pressures.The calculation results show that there exists a point on the pipe inner wall where large size particles collide with wall intensively,giving rise to the tail pipe fault as a main cause,higher total pressure makes more collisions between particles and wall while larger size particles provoke makes more collisions.Accordingly some suggestions are prompted to enhance the reliability of heat resistant construction for a tail pipe nozzle.