底排推进剂瞬态泄压工况下燃烧流场特性的数值模拟  

Numerical Simulation of Combustion Flow Field Characteristics of Base Bleed Propellant Under Transient Pressure-release

作　　者：曹永杰[1] 余永刚[1] 叶锐[1] 周彦煌[1] 姚远[2] 

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 [2]中国兵器工业集团第051基地,陕西华阴714200

出　　处：《含能材料》2013年第4期464-468,共5页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金项目(51176076);江苏省普通高校研究生科研创新计划项目(CXZZ12_0215)

摘　　要：针对底排弹出炮口泄压瞬间燃烧失稳问题,建立了AP/HTPB底排推进剂燃烧流场的二维轴对称非稳态模型,通过数值模拟获取了底排模拟装置在瞬态泄压工况下的流场特性。结果表明:在泄压过程中,燃烧室内压力、密度和温度沿轴向迅速下降,速度沿轴线迅速升高,且各流动参数的变化梯度逐渐减小;底排推进剂燃气的加入导致燃烧室内密度沿径向降低,而温度沿径向升高;燃烧室内压力随时间变化的计算值与实测值吻合较好。Aiming at the combustion destabilization during the depressurization of base bleed projectile when propelled out of gun muzzle, a 2D-axisymmetric unsteady model for the combustion flow field of AP/HTPB base bleed propellant was established. The flow field characteristics in base bleed simulator under transient pressure-release were obtained through numerical simulation. Results show that in the pressure-release process, the parameters such as the pressure, the density and the temperature in the combustion chamber decrease quickly along the axial direction, the gas flow rate rises rapidly, and the gradients of various parameters gradually decrease. As a result of the base bleed propellant gas ejecting into the chamber, the density decreases along the radial direction, whereas the temperature increases on the contrary. The calculated pressure varying with time in the combustion chamber agrees well with the experimental data.

关 键 词：兵器发射理论与技术 底排推进剂 瞬态泄压 非稳态流动 底排燃烧室 内流场 

分 类 号：TJ413.5[兵器科学与技术—火炮、自动武器与弹药工程]