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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。
In order to explore the method and feasibility of numerical study on the transport of gel propellants, based on the experiments of straight tube and abrupt section flow of gel propellant, two constitutive models, Power-Law and Carreau, were established to establish non-Newtonian fluid Dimensional two-dimensional incompressible steady-state flow. The numerical simulation of the pressure drop of the gel propellant supply pipe flow based on the SIMPLE algorithm is carried out by discretely solving the two-dimensional incoherent grids. The effects of wall slip correction and thixotropy on the tube Flow pressure drop effects. The results show that the error of the numerical solution of analytical solution of the axial velocity of cross-section of a straight pipe flow with simulated liquid is less than 2%; the pressure drop of pipe flow considering wall slip correction is in good agreement with the experimental value; The local pressure drop has a significant impact on the further optimization of the supply pipe and injector design has some theoretical significance.