阶梯装药火箭发动机多点点火燃气内流场研究  

Characteristics of flow field in multi-purpose ignition gas for rocket motor with stair step charge

作　　者：齐治 王浩[1] 周柏航 QI Zhi;WANG Hao;ZHOU Baihang(School of Energy and Power Engineering,Nanjing University of Science and Technology, Nanjing 210094, China)

机构地区：[1]南京理工大学能源与动力工程学院,南京210094

出　　处：《兵器装备工程学报》2022年第2期21-27,共7页Journal of Ordnance Equipment Engineering

摘　　要：在阶梯装药结构的大型固体火箭发动机中,采用多点点火技术对火箭发动机装药的正常燃烧推力性能的稳定至关重要。本文建立了点火药盒内点火药燃烧过程的经典内弹道模型,采用Fluent软件,对不同点火药盒数量和不同的放置位置(即以点火药量330 g采用头部及中部同时点火,以点火药量400 g采用头部及中部同时点火,以点火药量330 g采用尾部及中部同时点火,以点火药量为400 g尾部及中部同时点火等4种工况)的点火药燃气流入推进剂药床中的流动过程及内流场的流动特性进行了数值仿真计算。研究结果表明,针对头部与中部以330 g及400 g药量点火,其点火燃气的内流场特性,数值计算结果与试验计算结果基本一致;在4种工况中,头部与中部同时点火的结构点火效果优于尾部与中部同时点火的结构,可以较快地形成均匀一致的点火压力分布,有利于提高推进剂点火的同步性与均匀性。In the large solid rocket motor with stepped charge structure,the multi-purpose ignition technology was used to form a uniform ignition,which is very important to the stability of the normal combustion thrust performance of the rocket motor charge.This paper established the classical internal ballistic model of ignition powder combustion process in ignition box,and used Fluent software to simulate the flow process of ignition gas into propellant bed and the flow characteristics of internal flow field.The results show the internal flow field characteristics of the ignition gas with 330 g and 400 g charge in the head and middle are basically consistent with the experimental results.In the four working conditions,the ignition effect of the head and middle ignition is better than that of the tail and and the uniform ignition pressure distribution can be formed quickly.

关 键 词：固体火箭发动机 多点点火 点火装置 点火性能 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程] TJ86[兵器科学与技术—武器系统与运用工程]