仿生水翼结构对空化抑制效果影响的数值分析
Numerical analysis of effect of bionic hydrofoil structure on cavitation suspension
赵伟国 1刘金晶 2张佳瑜 2秦嘉伟2
作者信息
- 1. 兰州理工大学能源与动力工程学院,甘肃兰州 730050;甘肃省流体机械及系统重点实验室,甘肃兰州 730050
- 2. 兰州理工大学能源与动力工程学院,甘肃兰州 730050
- 折叠
摘要
空化对流体机械表面造成高频脉动冲击,使其动力性能下降.为提高水翼的抗空化性能,研究水翼表面仿生结构参数对空化抑制效果的影响.采用SST-TM湍流模型和Zwart-Gerber-Belamri空化模型,对不同参数仿生结构水翼的空化流场和水动力学特性进行了数值模拟研究.探究仿生结构的弦向位置、宽度、角度对空化效果的影响,初步揭示空化抑制机理.结果表明:当仿生结构的弦向位置为L=0.3C、宽度为b=0.15δmax、角度为θ=14°时抑制效果最明显,与原型水翼相比空泡数减少24％,水翼振动频率减小23％,升阻比提高4.73％,回射流厚度和强度明显减弱;随着仿生结构接近尾缘,吸力侧上的空化区先减小后增大,在空化充分发展的空腔末端设置仿生结构抑制效果最明显;存在最佳宽度参数使空泡体积数最少,最小压力系数增大明显,升阻比最大;仿生结构角度的增大能更好地增大水翼近壁面压力,同时也会引起旋涡的生成,加剧流场的不稳定性.
Abstract
Cavitation will cause high frequency pulsation impact on the fluid machinery surface,which will degrade its dynamic performance.In order to improve the cavitation suspension performance of hy-drofoil,the influence of surface bionic structure parameters on the cavitation suspension effect of hydro-foil was studied.SST-TM turbulence model and Zwart-Gerber-Belamri cavitation model were used to numerically simulate the cavitation flow field and hydrodynamic characteristics of bionic structure hy-drofoil with different parameters.The influence of the chord wise position,width and angle of the bionic structure on the cavitation effect was explored,and the mechanism of cavitation suspension was initially revealed.The results show that when the chord wise position of the bionic structure is L=0.3 C,the width is b=0.15δmax and the angle is θ=14°,the suspension effect is the most obvious.Compared with the prototype hydrofoil,the number of cavitation is reduced by 24％,the vibration fre-quency of hydrofoil is reduced by 23％,the lift-drag ratio is increased by 4.73％,and the thickness and strength of the reverse jet flow are significantly weakened.As the bionic structure approaches the tail,the cavitation area on the suction side decreases first and then increases,and the suppression effect is the most obvious when the bionic structure is set at the end of the cavity where the cavitation is fully developed.With the optimum width parameter,the volume number of cavitation is minimum,the minimum pressure coefficient increases obviously,and the lift-drag ratio is maximum.The increase of the bionic structure angle can better increase the pressure near the wall of the hydrofoil,and cause the generation of vortex,and aggravate the instability of the flow field.
关键词
NACA0015翼型/仿生结构/结构参数/数值模拟/空化被动控制Key words
NACA0015 hydrofoil/bionic structure/structural parameter/numerical simulation/passive control of cavitation引用本文复制引用
基金项目
国家自然科学基金资助项目(52169018)
甘肃省教育厅产业支撑计划项目(2021CYZC-27)
出版年
2024
国家科技期刊平台
NSTL
万方数据