整装式液体发射药燃烧推进过程的内弹道特性  

Interior Ballistic Characteristics of Combustion and Propulsion Process of Bulk-loaded Liquid Propellant

作　　者：姜冬冬 薛晓春[1] JIANG Dongdong;XUE Xiaochun(School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)

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：《兵工学报》2021年第4期755-763,共9页Acta Armamentarii

基　　金：国家自然科学基金项目(51506096)。

摘　　要：为研究液体药燃烧过程中的压力波以及Taylor-Helmholtz不稳定效应对内弹道性能的影响,针对12.7 mm小口径整装式液体药燃烧发射装置,利用有限元分析软件ANSYS建立气体与液体两相反应流数理模型。通过数值模拟得到液体发射药燃烧过程中Taylor空腔气体与液体界面的演化特性,以及组分质量分数、液体药蒸发速率、化学反应速率和温度云图。结果表明:蒸发和燃烧反应主要发生在Taylor空腔表面,而产物则会均匀地扩散到整个空腔;同时由于Helmholtz不稳定效应,空腔表面会出现褶皱现象。在整个扩展过程中,空腔的轴向扩展速度远大于径向扩展速度,药室四周仍残留有较多液体药,在Helmholtz不稳定效应作用下参与燃烧,从而导致其内弹道稳定性变差,压力振荡加剧。A gas-liquid two-phase flow and reaction mathematical model for the 12.7 mm small caliber launch device was established by ANSYS 2020.The proposed model is used to study the influences of pressure wave and Taylor Helmholtz instability effect on the internal ballistic performance during the combustion process of liquid propellants.The evolution characteristics of Taylor cavity gas-liquid interface during the combustion process of liquid propellant were obtained through simulation,and the mass fraction of components,evaporation rate of liquid propellant,chemical reaction rate and temperature contours were obtained as well.The simulated results show that the evaporation and combustion reactions mainly occur on the surface of Taylor cavity,and the reaction products diffuse to the whole cavity.At the same time,some wrinkles are found on the cavity surface because of Helmholtz instability effect.In the whole process of expansion,the axial expansion speed of the cavity is far greater than the radial expansion speed,and there are still many liquid propellants around the chamber.As a result,the stability of interior ballistics becomes worse and the pressure oscillation intensifies.

关 键 词：液体发射药 湍流燃烧 Taylor空腔 数值模拟 

分 类 号：TJ012.15[兵器科学与技术—兵器发射理论与技术]