文献类型：期刊文献

中文题名：不同深度水下发射超声速燃气射流流场特性分析

英文题名：Analysis of flow field characteristics of supersonic gas jet of underwater launch with different depth

作者：崔祚 薛牧遥 尹超

第一作者：崔祚

机构：[1]贵州理工学院航空航天工程学院,贵州贵阳550003;[2]上海新力动力设备研究所,上海200125

第一机构：贵州理工学院航空航天工程学院

年份：2025

卷号：46

期号：5

起止页码：118-128

中文期刊名：推进技术

外文期刊名：Journal of Propulsion Technology

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金(12002097,12262006)。

语种：中文

中文关键词：水下发射;超声速燃气射流;流场特性;推力脉动;燃气泡

外文关键词：Underwater launch;Supersonic gas jet;Flow field characteristics;Thrust pulsation;Gas bubbles

摘要：基于雷诺时均Navier-Stokes(RANS)方法和流体体积(VOF)方法,建立水下燃气射流仿真模型,研究水下发射超声速燃气射流的流场特性,分析不同水深和不同扩张比对燃气射流物理过程的具体影响。结果表明,水下发射燃气射流的形态在很大程度上取决于喷管扩张比和水深两个参数。在同一水深条件下,当扩张比为1.8时,燃气泡呈现“蘑菇”状,沿喷管轴线周期性膨胀和颈缩。扩张比为4.25时,燃气泡呈现向周围不断扩张的射流状态,膨胀和颈缩速度快且发生位置不再对称。水下发射流场压力的振荡特性与燃气泡气液界面的不稳定性直接相关,远离燃气泡的区域压力扰动小。水深越深,同一扩张比喷管平均推力越小;同一水深,发动机扩张比越大,对应的推力振荡越大。
Based on the Reynoldsaveraged NavierStokes(RANS)and the volume of fluid(VOF)methods,a numerical model of underwater supersonic gas jet is developed to investigate the flow field characteristics with variable depth,and the influence on the physical phenomena related to the evolution of underwater gas jet is studied in terms of the water depths and expansion ratios.The results show that the shapes of the underwater launching jet depend on the expansion ratio of the nozzle and the water depth.Under the same condition of water depth,the“mushroom”shape of gas bubble is shown when the expansion ratio is 1.8,and the expansions and necks are periodically appeared along the nozzle axis.When the expansion ratio is 4.25,the bubble of gas jet is expanded towards the surrounding water.The speeds of expansion and neck are fast,and their positions are no longer symmetrical.The pressure oscillations of flow field are directly related to the instability of the gas-liquid interface of gas bubble,and the pressure disturbance in the position away from the gas bubble is small.With the same expansion ratio,the deeper the water depth,the smaller the average thrust of the underwater engine.At the same water depth,the greater the expansion ratio,the greater the oscillations of the thrust.