A Characteristic Analysis Of Internal Flow Field And Thermal Protection In The Pulse Engine

Side nozzle pulse motors as the executive mechanisms of guided ammunition’s thrust vector control system are smart solid propellant rocket motor, It has a quick response characteristics than pneumatic rudder-control incomparable.Engine block is a series of independent, high impact mass ratio, short pulse solid rocket motor together. It can effectively strengthen the capacity ammunition to hit moving targets, reducing the consumption of ammunition, to meet the needs of modern warfare intelligent munitions.Numerical simulation and test methods described herein for inner flow field of solid rocket motor and characterizing thermal protection.the main points of the present paper are as follows:(1)Fluid calculation software is deployed to carry out a simulation analysis on the 3D internal flow field to analysis of the structure of the flow structure affect the engine performance parameters and the nozzle. Results shows that:The methods used can be used to simulate the integrated flow field and estimate the performance of engine; the radial thrust decrease with the increasing of the eccentric distance of eccentric segment, and center of the radial thrust moving from the inside to the outside of the nozzle; the radial thrust increase with the increasing of the height between nozzle and the eccentric segment, and center of the radial thrust varied sharply; due to limitations of the engine structure, the length of the eccentric section have less effect on the engine.(2)Numerical simulation of fluid-solid coupled heat transfer of different structures and different materials of engine. Results shows that:The vortex of gas flow accounts for the major cause of the high temperature and ablation in the surface, aluminum base must increase thermal protection systems. Temperature field structures of different material base of basically the same, due to the difference in thermal conductivity and specific heat capacity of the wall temperature gradient will exist some differences.(3)The engine wall temperature using infrared cameras to measure the impact of materials and structural analysis engine temperature distribution and ablation. Results shows that:computational model can be used to accurately simulate the heat engine to compare, The maximum temperature of the base portion located in contact with the combustion chamber.