旋转条件下长尾喷管发动机三维两相流场数值模拟

Three Dimension Two Phase Flow Field Numerical Simulation on Tail-Pipe Nozzle SRM under Spinning Condition

针对旋转条件下长尾喷管发动机的三维两相流场开展了一体化数值模拟,进行了旋转速度为0、100 r/min、300 r/min、500 r/min和1 000 r/min,颗粒直径为10μm、40μm、70μm和100μm条件下颗粒运动轨迹和聚集浓度分布影响的研究。研究结果表明:①与无旋转条件下的颗粒运动轨迹以及聚集分布规律相比,在本旋转条件下,颗粒的运动历程增加,滞留时间增加,颗粒的聚集部位发生改变;②随着旋转速度增大,颗粒加入主流后首先贴着壁面作周向环绕运动,旋转速度越大,颗粒的旋转环绕轨迹越长;颗粒环绕运动的区域也随着旋转速度的增大而增大;颗粒所滞留的时间总体上是增大的;③随着颗粒直径的增大,由于颗粒本身运动惯性的增大,随流性变弱,受旋转作用影响的程度变差,滞留时间减小;④随着旋转速度的增大,锥台型装药壁面和后封头处的颗粒聚集浓度呈现增加趋势,翼槽表面的颗粒聚集带由翼槽顶部向根部移去;轴线处的颗粒聚集浓度随旋转速度增大而逐渐减弱。

Numerical simulations of three dimensions two - phase flow field of tail - pipe SRM under spinning condition are carried out. The differences of the particle trace and particle concentration along the wall of tail - pipe nozzle between the different diameters 10 μm, 40 μm, 70 μm, 100 μm and different spinning velocities 0, 100 r/min, 300, r/min, 500 r/min, l 000 r/min are studied. The results show that ：①in comparison with the particle movement trace and particle concentration distributing rule under the no - spinning condition, the particle movement path and time are increased and the change of particle movement rule is obvious under the spinning condition;② With the increase of the spinning velocity, the movement path and area of particles and residence time are increased;③With the increase of the particle diameter, the particle residence time is shortened because the particle inertia has more effects than the trend to revolving effect; ④With the increase of the spinning velocity, the particle concentration in surface of conocyl grain is increased, and the particle congregation area is transferred from the fin top to the root of finocyl grain. The particle concentration is reduced in axis of flow path with the increase of spinning velocity.