|
文摘
|
根据非定常可压缩流动的Navier-Stokes方程和Spalart-Allmaras湍流模型,基于计算流体力学分析软件,采用动网格技术,对弹丸在气室高压气体作用下的运动规律及其流场特性进行了仿真。主要研究了4种不同气室初始气压下膛内平均压力、弹底压力、气室底部压力、弹丸运动参数的变化规律,进一步分析了在气室初压为2.5 MPa下不同时刻马赫数等值线的变化规律。研究结果表明:膛内气流存在振荡现象,气室底部压力、弹底压力变化具有波动性;气室初始气压的大小影响气室底部压力、弹底压力振荡幅度及弹丸出炮口速度;弹丸在管内运动速度及运动时间随距离变化的关系均近似抛物线分布。 |
|
其他语种文摘
|
According to Navier-Stokes equation and Spalart-Allmaras turbulence model,the motion law of projectile under the action of high- pressure gas and its flow characteristics are simulated by using the dynamic mesh method based on CFD software. The change rules of in-bore average pressure, projectile base pressure, chamber base pressure and projectile motion parameters at the four kinds of initial pressure in the chamber are mainly studied. The changes of Mach number contours at different time at initial pressure up to 2.5 MPa are analyzed. Research results show that a flow oscillation phenomenon occurs in the bore,and the changes of chamber base pressure and projectile base pressure are fluctuating. Initial gas chamber has the effect on the pressure oscillation amplitudes of chamber base and projectile base and the projectile in the muzzle velocity. The relationship between projectile motion velocity or motion time and motion distance in the barrel is approximately parabolic. |
|
来源
|
兵工学报
,2016,37(9):1612-1616 【核心库】
|
|
DOI
|
10.3969/j.issn.1000-1093.2016.09.009
|
|
关键词
|
兵器科学与技术
;
高压气体
;
动网格
;
内弹道
;
膛口流场
;
计算流体力学
|
|
地址
|
南京理工大学自动化学院, 江苏, 南京, 210094
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1000-1093 |
|
学科
|
武器工业 |
|
文献收藏号
|
CSCD:5837098
|
了解气象卫星更多信息，请访问