射流推力矢量喷管粒子沉积特性数值模拟

Numerical Simulation on Characteristic of Deposition in Fluidic Thrust Vector Nozzle

运用粒子轨道模型对基于激波控制的三维轴对称收缩扩张喷管中的气固两相流动进行了数值模拟,研究了1～100μm不同直径粒子的沉积特性。计算结果表明:主流中粒子的沉积部位主要集中在喷管的收敛段和喉部附近,粒子直径越大,沉积区域越大,大沉积率越高;二次流中的大尺寸粒子会对扩张段壁面造成烧蚀。射流推力矢量喷管的热防护设计应充分考虑到二次流中粒子对壁面的烧蚀。

Numerical simulations on gas-solid two-phase flow in axisymmetric shock induction controlled vectoring exhaust nozzle were carried out using particle trajectory model.The characteristics of deposition were studied on particles＇ diameter changed from 1μm to 100μm.The result indicates that the particles in the main flow mainly deposited in the area of divergent part and the throat,and with the accretion of particle diameter,the deposition area extends,the deposition rate increases.Large particles in the secondary flow could ablate the wall.The ablation from particles in secondary flow must be considered into the design of heat-resistant construction.