膛内高温燃气对底排药剂点火过程影响的数值分析  

Numerical Analysis on Effect of High Temperature Gas in Bore on Ignition Process of Base Bleed Propellant

作　　者：张领科[1] 周彦煌[1] 赵威[1] 曹永杰[1] 

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《南京理工大学学报》2010年第6期770-774,共5页Journal of Nanjing University of Science and Technology

基　　金：南京理工大学自主科研专项计划(2010GJPY023)

摘　　要：为研究底排药剂在火炮内弹道过程中的点火特性,根据膛内火药燃气高温高压的特点及底排药剂加热点火的主要热交换方式,建立了点火过程的物理模型。基于含能材料固相点火理论模型,仅考虑热对流和热辐射换热的边界条件,构建了点火过程的数学模型。弹底环境通过联立求解内弹道模型和膛内气体状态方程来确定。针对某155 mm火炮及所装备的底排弹,计算分析了底排药剂的点火过程及影响因素。数值计算结果表明:膛内弹底燃气温度随时间变化逐渐减小;着火点位于距底排药柱内表面约120μm厚的薄层内;点火延迟时间约为1.672 ms;点火延迟时间随火药燃气速度和辐射热通量的增大分别近似呈三阶多项式递减关系。According to the characteristics of high-temperature and high-pressure propellant gas in bore and the main thermal exchanging style for heating ignition of base bleed propellant,a physical model of ignition process is built to study the ignition property of base bleed propellant in the gun interior ballistic process.The mathematical model of the ignition process based on the condensed-phase ignition theory model for energetic material is constructed considering the heat transfer boundary conditions of thermal convection and radiation only.The projectile-base environment is determined via simultaneous solution of the interior ballistic model and the state equation of gas in bore.Aiming at a type of 155 mm artillery equipped with a base bleed projectile,the ignition process and affecting factors are analyzed.The numerical analysis results show： the base temperature of a projectile decreases with time change;the ignition occurs in a thin layer near the inside surface of a propellant about 120 μm;the ignition delay time is about 1.672 ms;with the independent increase of gas velocity or radian heat flux,the ignition delay time of base bleed propellant presents a three-order plolynominial fuction decreasing trend for each factor.

关 键 词：内弹道 底排药剂 火药燃气 点火 

分 类 号：TQ534[化学工程—煤化学工程]