充液圆管周向多股壁面燃气射流排水特性

doi:10.3969/j.issn.1000-1093.2020.12.006

摘要/Abstract

摘要： 为探索水下火炮低阻高速发射新方式及工作原理，提出一种在身管内壁开设若干道凹槽、引导部分弹后火药燃气实时排水的方式，以达到在类似于空气中发射的效果，实现水下火炮低阻高速发射的目的。建立充液圆管多股燃气排水的三维非稳态两相流模型，并针对30 mm充液圆管气体与液体相互作用过程进行数值模拟。结果表明：多股燃气射流在扩展过程中沿周向率先汇聚，随后协同排出壁面附近的液体工质，最后完成径向汇聚，形成柱状气幕。多股燃气射流在圆管内的轴向扩展速度先短暂地迅速衰减，随后由波动上升逐渐转变为非线性上升。喷孔近场区域内，各截面燃气面积分数在波动中逐渐上升；喷孔远场区域内，燃气射流扩展到某一截面时，该截面燃气面积分数迅速上升，但在随后的扩展过程中，燃气面积分数缓慢上升且存在波动。充液圆管内燃气体积分数呈非线性增长，排水效果良好。

关键词: 水下火炮, 水下气幕, 壁面燃气射流, 气体与液体相互作用, 排水特性

Abstract: Launching mode，which achieves the same effect as launching in the air by opening several grooves on the inner wall of barrel to guide a part of the combustion gas for real-time drainage， is proposed for exploring the underwater gun fire at low-resistance and its working principle.A three-dimensional unsteady two-phase flow model for the multiple gas jets in the liquid tube is established. The interaction process of gas-liquid in 30mm liquid-filled circular tubes was numerically simulated.The results show that the multiple gas jets converge along the circumferential direction during the expansion process，and then cooperate to discharge the liquid near the wall.Finally，the multiple gas jets converge radially and form a columnar gas curtain. Axial expansion speed of multiple gas jets in the circular tube decays briefly and rapidly first and then changes from fluctuating rise to nonlinear rise.In the near-field of the orifices，the gas area fraction of each section increases gradually with fluctuating. In the far-field of the orifices， the gas area fraction of each section increases rapidly when the gas jets extend to a certain section， and then it rises slowly with fluctuating. The volume fraction of gas in the water-filled circular tube increases non-linearly, and the drainage effect is good.

Key words: underwatergun, underwatergascurtain, wallcombustiongasjet, gas-liquidinteraction, drainageeffect

中图分类号:

TJ302
O358

胡雨博，余永刚. 充液圆管周向多股壁面燃气射流排水特性[J]. 兵工学报, 2020, 41(12): 2417-2423.

HU Yubo， YU Yonggang. Drainage Characteristics of Circumferential Multi-strand Wall Combustion Gas Jets in a Liquid-filled Circular Tube[J]. Acta Armamentarii, 2020, 41(12): 2417-2423.

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[1]	周良梁，余永刚，刘东尧，莽珊珊. 水下火炮气幕式发射过程中燃气射流与液体工质相互作用特性研究[J]. 兵工学报, 2016, 37(8): 1373-1378.
[2]	赵嘉俊，余永刚. 柱形充液室内多股燃气射流流场的气体与液体两相流场演化特性[J]. 兵工学报, 2016, 37(10): 1852-1859.