底排装置非定常环状伴随射流的特性分析  

Characteristic Analysis of Unsteady Annular Injection of Base-Bleed Equipment

作　　者：周书培 余永刚[1] ZHOU Shu-Pei;YU Yong-Gang(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：《工程热物理学报》2021年第10期2720-2730,共11页Journal of Engineering Thermophysics

基　　金：中央高校基本科研业务费专项资金资助(No.30918011324)。

摘　　要：为了研究环形喷口底排弹出膛口时的尾部二次燃烧特性和环状伴随射流流动特性,针对底排燃烧室在瞬态泄压条件下的强非稳态扰动过程,建立了环状喷口射流与超声速来流相互作用的二维轴对称化学非平衡流模型,数值研究环形喷口底排装置的非定常伴随射流燃烧流动演化特性。计算结果表明:环形喷口射流在泄压初期挤压形成高度欠膨胀的中心射流,随着喷口压力降低,逐渐转变为亚音速环状射流。泄压中期,燃烧反应强度由射流边缘向中心轴线方向逐渐加剧,在气体回流作用下,尾部流场温度快速升高。在泄压过程中,不同初始压力下的底部压力和轴线温度变化趋于一致。随着燃烧室内初始压力增大,底压系数峰值增加,降压时间延长。1.5 ms后,初始压力对尾部流场无明显影响。In order to study the wake secondary combustion characteristics and annular injection characteristics when the base-bleed projectile is propelled out of the muzzle,a two-dimensional axisymmetric chemical non-equilibrium model for interaction between annular nozzle injection and supersonic inflow is set up for the strong unsteady disturbance process under transient depressurization.The combustion and flow characteristics of unsteady annular injection of base-bleed equipment are simulated numerically.The results show that the transient depressurization for base-bleed projectile with annular nozzle is a process that a highly under-expanded supersonic annular jet containing central jet develops into a subsonic annular jet.In the middle stage of depressurization,the intensity of combustion gradually enhances from the edge of jet to the centerline,and the temperature of the wake flow field increased rapidly under the effect of recirculation.During the depressurization process,the variation in base pressure and axis temperature tend to be consistent for different initial pressures.As the initial pressure in the combustion chamber increases,the peak of base pressure coefficient and the depressurization time increases.After 1.5 ms,the initial pressure had no significant effect on the wake flow field.

关 键 词：化学非平衡流 伴随射流 瞬态泄压 二次燃烧 环形喷口 

分 类 号：O354[理学—流体力学] V211.3[理学—力学]