【作者】 何淼生； 覃粒子； 刘宇；

【Author】 HE Miao-sheng,QIN Li-zi,LIU Yu School of Astronautics,Beijing University of Aeronautics and Astronautics,Beijing,100191.

【机构】 北京航空航天大学宇航学院；

【摘要】 采用流体体积法(VOF)两相流模型对设计马赫数2.0的圆锥塞式喷管水下发射初期动态流场进行气水耦合数值模拟。计算给出喷管流场结构及射流发展规律、塞锥表面流动、气液界面及传播特性,并对水下与海平面大气环境下的推力补偿特性进行对比。计算结果显示:与Laval喷管气泡变化过程有所不同,圆锥塞式喷管近场流动稳定,不会出现显著的大幅度胀鼓-颈缩或回击现象,但存在高频小幅度的胀鼓-颈缩现象,一个鼓胀-颈缩振荡过程的平均频率高达102.04Hz;相比于大气环境,水下圆锥塞式喷管具有较高推力补偿能力,但是,高度过膨胀状态下,水下圆锥塞式喷管推力系数随时间变化一直处于剧烈振荡状态,并伴随有低频高值推力脉冲。更多还原

【Abstract】 To investigate the flow structures of a Mach 2.0 annular conical aerospike nozzle for underwater launch,a volume of fluid(VOF) two-phase flow model is utilized for numerical simulation.The flow structure,gas bubble development,flowfield near plug,the gas-water interface and the propagation characteristics are highlighted,Furthermore,thrust compensation characteristics are compared.The calculation results showing that the variation of bubble is more stable and without substantial expansion bulge-necking or back attack phenomenon in rear field of annular conical aerospike nozzle,compared with the Laval nozzle.But there is a high-frequency,small-amplitude bulge-necking phenomenon with a oscillation frequency up to 102.04Hz.The thrust coefficient analysis indicates that aerospike nozzle has higher compensation of 0.8%foe underwater propulsion, however,the thrust coefficient has been in a time-varying volatility,and is accompanied by low-frequency,high-value thrust pulse at overexpansion.更多还原