膏体推进剂管道输运仿真及试验
首先对膏体推进剂和三种模拟液进行了流变学测试，发现其均表现出剪切变稀的特性。在低剪切应力时推进剂及其模拟液主要表现出弹性特性，但随着剪切应力增大而逐渐表现出粘性特性。另外，还得到了其各自的幂律本构方程。在流变学测试基础上，对管道输运过程进行数值仿真，结果表明：膏体推进剂在管道中流动时型面呈现抛物面状，流出管道后，有明显的挤出胀大效应。在管道中流动时的速度和压力损失随管径的增大而增大，随质量流率的增大而减小。27357
同时对膏体推进剂进行了管道挤出实验，发现其挤出流动性较好，验证了试验装置的可靠性。进行了点火发动机和燃气发生器的点火试验，点火时，工作正常，性能可靠。
关键词 膏体推进剂火箭发动机 管道输运 数值仿真 点火试验
毕业论文设计说明书外文摘要
Title The simulation and experiment of the past propellant pipeline
Abstract
In this paper, under the background of pasty propellant rocket engine applications, the rheological properties of pasty propellant, pipeline transport processes, flow numerical simulation method, ignition engines and gas generator ignition test were studied.
First, the rheological tests of the paste propellant and three kinds of simulated liquid are carried out, and the elastic properties of the low shear stress are demonstrated. The complex viscosity decreases with the increase of the angular frequency, and shows the shear thinning property. When angular frequency is large, dynamic viscosity id larger than the imaginary viscosity, it showed significant viscous behavior.
Based on the rheology of propellant, numerical simulation of pipeline transport is carried out. The results showed that: pasty propellant in the pipeline flow profile exhibits a parabolic shape, after the outflow pipe, a significant effect of die swell. The velocity and pressure loss of flow in the pipeline have a lot to the pipe diameter and mass flow rate.
At the same time, the extrusion of the paste was carried out, and the extrusion flow characteristics were observed and the simulation results were close to the flow property.The ignition test of the ignition engine and the gas generator is carried out, and the operation is normal and the performance is reliable.
Keywords pasty propellant Gas generator Pipeline transport Numerical simulation Ignition experiments
目 次
1 引言 2
1.1 概述 2
1.2 研究背景及意义 3
1.4 本文主要工作 7
2 膏体推进剂流变特性研究 9
2.1 非牛顿流体流变模型概述 9
2.2 膏体推进剂流变学测试研究 11
2.2.1 测试方法与样品 11
2.2.1 测试结果 14
2.3 本章小结 16
3 膏体推进剂管道输运过程数值仿真研究 17
3.1 几何模型及边界条件 17
3.2 膏体推进剂数值仿真结果分析 19
3.2.1流动过程 19
3.2.2流动速度 20
3.2.3压力损失 26
3.3 本章小结 27