级间通道构型对小型双脉冲发动机燃烧室内两相流的影响

Effects of Inter-Stage Pulse Channel Configurations on Two-Phase Flow in Combustion Chamber of Small Dual-Pulse Motor

为研究级间通道构型对小型双脉冲发动机燃烧室两相流的影响,气相采用SIMPLE算法和k-ε模型,两相流采用PSIC算法和离散相模型,对小型双脉冲固体火箭发动机内流场进行了详细的计算。结果表明,级间孔径的大小对流场影响很大。级间孔与燃烧室的直径比值影响粒子对级间结构和喷管收敛段的撞击及速度。级间开孔角度越大,再附着点的位置变化不大,但一脉冲内主流气体的速度越大。气固两相耦合的情况下,一脉冲燃烧室内的粒子速度也会增大。

In order to study the effects of inter-stage pulse channel configurations on two-phase flow in combustion chamber of small dual-pulse motor,the SIMPLE algorithm and k-ε model are used as gas phase,PSIC algorithm and discrete phase model are used as two-phase flow,the internal flow field of a small dual-pulse motor is calculated in detail. The results show that the diameter of the inter-stage channel has a great influence on the flow field,the ratio of the inter-stage ports and the combustion chamber diameter affecfs the impact and velocity of the particle on the inter-stage ports and nozzle convergent section. As the channel angle increases,the position of the reattachment point has no significant change,but the velocity of main flow which is in first pulse combustion chamber increases. In the case of gas-solid two-phase coupling,velocity of the particle which is in first pulse combustion chamber increases too.