水翼表面布置射流水孔抑制空化

发布时间：2018-08-02 14:42

【摘要】：为研究水翼表面布置射流水孔对空化的抑制效果,采用RNG k-ε湍流模型结合全空化模型对8°攻角NACA0066(MOD)水翼进行二维非定常空化流场计算,分析当射流比分别为0.1,0.2和0.3时的水翼表面空化流场结构及其演化过程的流动特性,得到了不同射流条件下水翼升阻力系数的变化趋势.计算结果表明:布置射流水孔可以有效阻挡回射流从翼型尾部向翼型头部的运动,使得空泡脱落现象明显减弱,从而抑制了片空化向云空化的发展,且随射流比增加,射流对回射流和云空化的抑制作用更加显著;射流的注入同时使得升力系数和阻力系数的波动幅度明显降低,有效减弱了升阻力的周期性振荡;虽然时均升力和时均阻力受射流的影响有下降趋势,但升阻比呈上升趋势,水翼升阻比由无射流孔时的6.11增加到射流比为0.3时的7.06,布置射流孔还起到了减阻的作用.
[Abstract]:In order to study the effect of jet holes arranged on hydrofoil surface to suppress cavitation, the 2-D unsteady cavitation flow field of 8 掳angle of attack NACA0066 (MOD) hydrofoil was calculated by RNG k- 蔚 turbulence model and full cavitation model. The cavitation flow field structure and the flow characteristics of the hydrofoil surface cavitation flow are analyzed when the jet ratio is 0.1g 0.2 and 0.3 respectively. The variation trend of the hydrofoil lift resistance coefficient under different jet conditions is obtained. The results show that the jet hole placement can effectively block the movement of the return jet from the rear end of the airfoil to the head of the airfoil, and make the cavitation fall off obviously, thus restraining the development of slice cavitation to cloud cavitation, and increasing the jet ratio. The effect of jet on the return jet and cloud cavitation is more obvious, the injection of jet simultaneously reduces the fluctuation amplitude of lift coefficient and drag coefficient, and effectively weakens the periodic oscillation of lift resistance. Although the time average lift and the time average resistance are decreased by the jet, the lift / drag ratio of the hydrofoil increases from 6.11 when there is no jet hole to 7.06 when the jet flow ratio is 0.3. The arrangement of the jet hole also plays a role in reducing the drag.
【作者单位】：大连理工大学海洋能源利用与节能教育部重点实验室;
【基金】：国家973计划项目(2015CB057301)
【分类号】：TV131.3

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