摘要
在水翼吸力面采用主动射流方法可以很好地控制绕水翼的空化流动,减弱空化的发生和发展。为此,基于主动控制方法,采用密度修正的SST kω湍流模型和Zwart Gerber Belamri空化模型,数值研究射流参数对于绕NACA66(MOD)水翼云空化的流动特性影响规律。根据正交设计方法,在来流雷诺数Re为5.07×105、攻角α为8°、空化数σ为0.83工况下,针对由不同射流参数组合而成的16组射流结构,评估了射流位置、射流角度和射流流量对绕水翼流场空化特性和水动力特性的影响,并获得最优射流特征参数。结果表明,射流位置对空化流动抑制影响最大,而射流角度对水动力学性能影响最大。采用最佳射流特征参数将使水翼空化流场中的时均无量纲空穴面积降低46.57%,时均升阻比提高5.59%。此时,顺来流方向的射流与向前缘发展的回射流碰撞并形成强烈的掺混,消耗了回射流的动量,从而阻碍了回射流继续向水翼前缘移动,极大地削弱了附着型空化的失稳脱落。
The active jet method on the suction surface of the hydrofoil can well control the cavitation flow around the hydrofoil and reduce the occurrence and development of cavitation.Therefore,based on the method of active jet,with the density⁃corrected SST kωturbulence model and the Zwart Gerber Belamri cavitation model,the effect of jet parameters on the flow characteristic of cloud cavitation around the NACA66(MOD)hydrofoil was numerically studied.According to the orthogonal design method,under the condition of incoming flow Re=5.07×105,the angle of attackα=8°,and the cavitation numberσ=0.83,by studying 16 groups of jet structures composed of different jet parameters,the influence of the jet position,jet angle and jet flow rate on the cavitation and hydrodynamic performance of the flow field around the hydrofoil was evaluated,and the optimal jet parameters were obtained.The results showed that the jet position had the greatest influence on the suppression of cavitation flow,and the jet angle had the maximum influence on the hydrodynamic performance.Using the optimal jet parameters can reduce the time⁃averaged dimensionless cavitation area by 46.57%and increase the time⁃average lift⁃drag ratio by 5.59%in the hydrofoil cavitation flow field.At this point,the injected jet in the downstream direction collided with re⁃entrant jet torwards the leading edge,which formed strong mixing and significantly consumed the momentum of the re⁃entrant jet,thereby preventing the re⁃entrant jet from continuing to move to the leading edge of the hydrofoil,greatly weakening the destabilizing shedding of attached cavitation.
作者
王巍
刘明雨
李智健
纪祥
王晓放
WANG Wei;LIU Mingyu;LI Zhijian;JI Xiang;WANG Xiaofang(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China;Key Laboratory of Ocean Energy Utilization and Energy Conservation,Ministry of Education,Dalian University of Technology,Dalian 116024,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2023年第4期161-169,共9页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(51876022)。
关键词
NACA66水翼
空化抑制
主动射流
水动力学性能
正交设计
NACA66 hydrofoil
cavitation suppression
active injection
hydrodynamic performance
orthogonal design
