丁羟推进剂花板浇注过程数值仿真

为研究丁羟推进剂浇注过程中流场结构,使用改进后的Herschel-Bulkley黏度模型对药浆花板浇注过程进行了数值模拟,并与实验数据进行了对比。结果显示:在通过花板孔后药浆会发生汇流,汇流后的药浆在重力作用下在发动机壳体内堆积,堆积表面呈现不规则的凹凸状,但在重力作用下,药浆会逐渐流平并填满空腔,未形成空洞。被花板分割的药条一部分汇聚后沿翼片间凹槽向下流动,一部分直接向下流动,流动过程中出现拉伸断裂的现象。浇注所需总时间为104 min,浇注药浆总质量为160.3 kg,平均质量流率为5.4 g·(hole·min)-1,仿真计算值与实测值误差分别为8.65%、2.06%和5.93%。

Numerical Simulation of the Pouring Process of HTPB Propellant

In order to study the flow field structure of HTPB propellant during the pouring process, the ameliorated Hurschel-Bulkley viscosity model, which can characterize the viscosity change of the solid propellant slurry during solidification, was used to simulate and analyze the pouring process of the slurry flooring. The theoretical results were compared with the experimental data, which show that the slurry will confluence after passing through the holes of the tube sheet. The slurry after confluence will accumulate in the engine shell under the action of gravity, while the surface of the slurry will be irregular concave and convex. However, under the action of gravity, the slurry will gradually be leveled and fill the holes without forming holes. A part of the strip separated by the tube sheet converges and flows downward along the groove between the wings, while the other part flows downward directly. During the flow process, the phenomenon of the tensile fracture occurs. The total pouring time is 104 min, the total mass of pouring slurry is 160.3 kg, and the average mass flow rate is 5.4 g·(hole·min)^-1. The error between the simulation value and the measured value is 8.65%, 2.06% and 5.93% respectively.