边界形状对4股燃气射流扩展稳定性影响的数值模拟

doi:10.3969/j.issn.1000-1093.2018.09.004

兵工学报 ›› 2018, Vol. 39 ›› Issue (9): 1692-1700.doi: 10.3969/j.issn.1000-1093.2018.09.004

边界形状对4股燃气射流扩展稳定性影响的数值模拟

冯博声，薛晓春

（南京理工大学能源与动力工程学院，江苏南京 210094）

收稿日期:2018-01-09 修回日期:2018-01-09 上线日期:2018-10-25
通讯作者: 薛晓春(1985—)，女，副教授，硕士生导师 E-mail:xiaochun13476@163.com
作者简介:冯博声(1993—)，男，硕士研究生。E-mail: fengbs720@163.com
基金资助:
国家自然科学基金项目（51506096）；江苏省自然科学基金项目（BK20150765）

Numerical Simulation of the Influence of Boundary Shape on the Expansion Stability of Four Combustion-gas Jets

FENG Bo-sheng， XUE Xiao-chun

(School of Energy and Power Engineering，Nanjing University of Science and Technology，Nanjing 210094，Jiangsu，China)

Received:2018-01-09 Revised:2018-01-09 Online:2018-10-25

摘要/Abstract

摘要： 为研究提高整装式液体发射药火炮燃烧稳定性的方法，从充液室结构出发，分析了冷态条件下边界形状对4股燃气射流扩展稳定性的影响。采用高速数字摄像系统，记录了4股燃气射流在5级圆柱渐扩型观察室中扩展过程。在此基础上，建立了气体与液体相互作用的三维非稳态数理模型，模拟了4股燃气射流在5级圆柱渐扩型、圆锥型和圆柱型观察室中扩展过程，获得了射流场三维两相分布图、压力和温度分布图。研究结果表明：4股燃气射流在5级圆柱渐扩型观察室中轴向位移的模拟值与实验结果较吻合；圆柱渐扩型和圆锥型观察室都可以增强燃气射流的径向扩展，有效抑制Taylor空腔与Helmholtz不稳定效应的正反馈机制；圆柱渐扩型由于台阶逐渐诱导作用，近喷孔处温度场无剧烈脉动，射流扩展更加稳定。

关键词: 4股燃气射流, Taylor扩展特性, 湍流掺混, 数值模拟

Abstract: The influence of boundary shape on the expansion stability of four combustion-gas jets under cold conditions is discussed to study an approach to improve the combustion stability of bulk-loaded liquid propellant gun. High-speed digital video recording system is used to record the expansion process of four combustion-gas jets in a five-stage cylindrical stepped-wall type observation chamber. On this basis, a three-dimensional unsteady mathematical model of gas-liquid interaction is established to simulate the expansion processes of four combustion-gas jets in a five-stage cylindrical stepped-wall type, conical and cylindrical observation chambers. The three-dimensional two-phase distribution chart, pressure and temperature distribution chart of jet field were obtained. The results show that the simulated results of axial displacements of four combustion-gas jets in the five-stage cylindrical stepped-wall type chamber coincide well with the experimental results. Both the cylindrical stepped-wall type chamber and the conical chamber can enhance the radial expansion of combustion-gas jet and effectively suppress Taylor cavity and Helmholtz instability; due to gradual induction of stepped-wall in the cylindrical stepped-wall type chamber, the temperature field near the nozzle has no severe pulsation and the jet expansion is more stable. Key

Key words: fourcombustion-gasjets, Taylorexpansioncharacteristics, turbulentmixing, numericalsimulation

中图分类号:

TJ012.1⁺5

冯博声，薛晓春. 边界形状对4股燃气射流扩展稳定性影响的数值模拟[J]. 兵工学报, 2018, 39(9): 1692-1700.

FENG Bo-sheng， XUE Xiao-chun. Numerical Simulation of the Influence of Boundary Shape on the Expansion Stability of Four Combustion-gas Jets[J]. Acta Armamentarii, 2018, 39(9): 1692-1700.

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边界形状对4股燃气射流扩展稳定性影响的数值模拟

Numerical Simulation of the Influence of Boundary Shape on the Expansion Stability of Four Combustion-gas Jets

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