整装式含能液体燃烧推进过程气液反应流场的数值模拟  

Simulation of Gas-liquid Reaction Flow Field for Combustion and Propulsion Processes of Bulk-loaded Energetic Liquid

作　　者：莽珊珊[1] 余永刚[2] MANG Shan-Shan;YU Yong-gang(School of Science, Nanjing University of Science and Technology,Nanjing 210094,China;School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学理学院,江苏南京210094 [2]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《含能材料》2017年第12期1011-1017,共7页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(51506094)

摘　　要：为研究燃烧室形状对整装式含能液体燃烧推进过程稳定性的作用机理,基于流体动力学理论和组分输运方程,建立了二维轴对称气液两相流动与燃烧模型,模拟了圆柱型和阶梯渐扩型燃烧室中的化学反应流场。通过对燃气空腔扩展和燃面运动的追踪,研究了温度、速度、压力以及体积分数的分布特征,分析了燃烧室形状对流场演化过程的影响规律。结果表明,含能液体点火燃烧后,所形成的燃气空腔在液体中快速膨胀,当空腔穿透液体并向弹底方向发展时,沿燃烧室轴向的燃面迅速增长,气液间的切向速度差带来Kelvin-Helmholtz不稳定效应,而阶梯渐扩型燃烧室有助于诱导径向湍流,减缓燃气空腔的轴向扩展速度,抑制轴向Kelvin-Helmholtz不稳定效应,提高整装式含能液体燃烧推进过程的稳定性,计算结果与实验数据吻合较好。To investigate the action mechanism of combustion chamber geometries on the stabilities of combustion and propulsion processes of bulk-loaded energetic liquid,based on theory of hydrodynamics and component transport equation,a two-dimensional axisymmetric model for gas-liquid two-phase flow and combustion was established.Numerical simulations for thechemical reaction flow fields in the cylindrical and multi-stage stepped-wall combustion chambers were conducted.The distribution characteristics of temperature,velocity,pressure,as well as volume fraction were studied via tracking of the expansion of gas cavity and movement of burning surface.The influence rule of combustion chamber geometries on the evolution processes of flow fields was analyzed.Results show that gas cavity formed after ignition and combustion of energetic liquid expands rapidly in the liquid,when the combustion gas cavity penetrates the liquid and develops to projectile bottom,the burning surface along the axial of the combustion chamber grows rapidly,the Kelvin-Helmholtz's instability efect occurs due to the tangential velocity difference between gas and liquid,whereas steppe d-wall combustion chamber is helpful for inducing radial turbulence,slowing the axial expansion velocity of gas cavity,suppressing axial Kelvin-Helmholtz's instability effect,and enhancing the stabilities the combustion and propulsion processes of bulk-loaded energetic liquid.The calculated results are in good agreement with the experimental data.

关 键 词：整装式含能液体 湍流燃烧 燃烧稳定性 数值模拟 

分 类 号：TJ301[兵器科学与技术—火炮、自动武器与弹药工程]