| 引用本文: | 赵成功,王聪,魏英杰,孙铁志.尾翼对高速射弹的空化与阻力特性影响分析[J].哈尔滨工业大学学报,2017,49(10):126.DOI:10.11918/j.issn.0367-6234.201511057 |
| ZHAO Chenggong,WANG Cong,WEI Yingjie,SUN Tiezhi.The analysis of cavity morphology and drag characteristics of high-speed underwater projectile with empennages[J].Journal of Harbin Institute of Technology,2017,49(10):126.DOI:10.11918/j.issn.0367-6234.201511057 |
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| 摘要: |
| 为研究尾翼对高速射弹水下运动时流体动力特性的影响，基于简化Rayleigh-Plesset空化模型和SST湍流模型，通过求解汽水混合物的RANS方程和相间质量传输方程，建立了具有相同弹体尺寸的有尾翼和无尾翼的两种平头射弹水下高速运动多相流计算模型.在相同的初始速度下，计算并对比分析两种射弹水下高速非定常运动的空泡形态及阻力特性.计算结果表明：两种射弹模型在水下高速运动时，均能迅速形成稳定的自然超空泡，有尾翼射弹的尾翼刺入空泡壁面内，破坏空泡原有的对称圆截面，形成带有凸起的空泡壁面形态；有尾翼射弹阻力系数大于无尾翼射弹阻力系数，且有尾翼射弹的阻力系数对空化数的变化更为敏感，随着空化数的增加，有尾翼射弹的阻力系数急剧增大，尾翼改变了弹体尾部超空泡的溃灭形态，空泡溃灭于弹体尾部时均引起阻力系数的波动；有尾翼射弹的空泡量纲一的长度、直径均大于无尾翼射弹的空泡量纲一的长度、直径，且在空泡溃灭于弹体尾部时，受尾翼的影响，两种射弹的空泡量纲一的长度、直径的变化速率有所差异.
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| 关键词: 多相流 射弹 尾翼 阻力特性 空泡形态 |
| DOI：10.11918/j.issn.0367-6234.201511057 |
| 分类号:TV131.2 |
| 文献标识码:A |
| 基金项目:中央高校基本科研业务费专项资金资助(HIT.NSRIF.201159)；黑龙江省自然科学基金(A201409) |
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| The analysis of cavity morphology and drag characteristics of high-speed underwater projectile with empennages |
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ZHAO Chenggong,WANG Cong,WEI Yingjie,SUN Tiezhi
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(School of Astronautics, Harbin Institute of Technology, Harbin 150001, China)
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| Abstract: |
| To investigate the influences of the empennages on the underwater projectile hydrodynamics, the paper established the numerical models of two high-speed supercavitating underwater projectiles which have identical dimensions except the empennages based on simplified Rayleigh-Plesset equation cavitation model and Shear Stress Transport (SST) turbulence model through solving the Reynolds Averaged Navier-Stokes (RANS) equations of mixture fluid and the mass transport equations between each phase. The projectile′s drag characteristics and supercavitation morphology variations were calculated, analyzed and compared within the identical initial velocity. The results show that the two kinds of projectile models can quickly form stable natural supercavity when moving underwater with a high speed; the impact of the empennages against the cavity surface destroys the original circle cross section of the supercavity and forms a bulge. The drag coefficient of the projectile with empennages is more sensitive to the change of the cavitation number. With the increase of the cavitation number, the drag coefficient of the projectile with empennages increases sharply, and the empennages change the collapse morphology of the supercavity near the tail of the projectile. The cavity collapse at the tail of the projectile causes the drag coefficient fluctuations. The dimensionless length and diameter of the cavity formed by the projectile with empennages are greater than those formed by the projectile without empennages. When the cavity collapses at the tail of the projectile, the variation rates of the dimensionless length and diameter of the cavity for these two projectiles are different due to the influence of empennages.
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| Key words: multiphase flow projectile empennage drag characteristics cavity morphology |
