幂律型煤油凝胶在不同几何构型管道的流动特性数值研究

为了优化煤油凝胶供给管道和锥形喷注器设计，构建出幂律流体的二维/三维稳态层流的求解方法，采用基于FLUENT平台的SIMPLE算法进行求解，开展煤油凝胶的流动特性数值研究。推导出了推进剂在直圆管中各参数的解析解以及层流的动能修正系数。研究结果表明：直圆管的柱塞流区域在管径不变时是固定的；为降低喷注器出口截面的平均表观粘度，需减小出口段长度；喷注器的收缩角选择在40°左右是较为合理的；弯管内存在双涡旋形式的二次流，且剪切速率和表观粘度的非对称性比速度的非对称性显著。为了优化煤油凝胶供给管道和锥形喷注器设计，构建出幂律流体的二维/三维稳态层流的求解方法，采用基于FLUENT平台的SIMPLE算法进行求解，开展煤油凝胶的流动特性数值研究。推导出了推进剂在直圆管中各参数的解析解以及层流的动能修正系数。研究结果表明：直圆管的柱塞流区域在管径不变时是固定的；为降低喷注器出口截面的平均表观粘度，需减小出口段长度；喷注器的收缩角选择在40°左右是较为合理的；弯管内存在双涡旋形式的二次流，且剪切速率和表观粘度的非对称性比速度的非对称性显著。

Numerical Research on Flow Characteristics of Kerosene Gel in Different Kinds of Pipeline Based on Power-law Constitutive Model

In order to optimize the design of kerosene gel supply pipeline and tapered injector, the power-law constitutive model is used to build a solution method of two-dimensional/three-dimensional incompressible steady flow. The flow characteristics of kerosene gel are numerically studied based on a SIMPLE algorithm. The analytical solution of parameters of propellant in straight round pipe and the kinetic energy correction coefficient of laminar flow are presented. The results show that the plunger flow area of straight round pipe is fixed when pipe diameter is unchanged. To reduce the average apparent viscosity of the injector outlet cross section, the length of outlet section needs to be decreased. The reasonable contraction angle of injector is about 40°. In elbow pipe, The secondary flow in the form of double vortices exits in elbow pipe. The asymmetries of shear rate and apparent viscosity are more significant than the asymmetry of flow velocity.