Abstract: In order to explore numerical method of the gel propellant flow and the feasibility，based on the gel propellant straight circular pipe and suddenly changed section pipe flow experiment，two kinds of constitutive models were used，which are Power-Law and Carreau models，respectively. Non-newtonian fluid control equations of two-dimensional incompressible steady flow were built，a staggered grid for discrete solution was used. The numerical simulation of pressure drop based on a SIMPLE algorithm of gel propellant feed pipe flow was carried out. The wall slip correction and thixotropic effect on pipe flow pressure drop were analyzed. It is found that the error between numerical and analytical solution of velocity profile of simulants in straight circular pipe flow is less than2%. The pressure loss of the numerical simulation considering wall slip correction of pipe flow has good consistency with the experimental data. Thixotropy has a significant effect on partial pressure drop of suddenly changed section pipe flow. The research has a certain theoretical guiding significance on further optimization of the supply pipeline and the injection design.

Key words: Gel propellants；Pressure drop；Wall slip correction；Thixotropy；SIMPLE algorithm；Non-newtonian fluid

摘要： 为了探索凝胶推进剂输送数值研究的方法及可行性，在凝胶推进剂直圆管和突变截面管道流动实验的基础上，采用Power-Law与Carreau两种本构模型，建立了非牛顿流体的二维不可压缩稳态流动的求解方法，通过交错网格进行离散求解，开展了基于SIMPLE算法的凝胶推进剂供给管流的压降数值仿真，分析了壁面滑移修正及触变性对管流压降的影响。结果表明:模拟液直圆管流的截面轴向速度的数值解同解析解的误差小于2%；考虑壁面滑移修正的管流压力损失与实验值一致性较好；触变性对突变截面管道流动的局部压降有显著的影响，这对于进一步优化供给管路及喷注器设计具有一定的理论指导意义。

关键词: 凝胶推进剂；压降；壁面滑移修正；触变性；SIMPLE算法；非牛顿流体