摘要
在翼身融合水下滑翔机表面上开孔并施加定常吸流可以改善滑翔机的水动力性能,为了探究定常吸流主动流动控制对翼身融合水下滑翔机剖面水翼升阻特性的影响规律和机理,基于计算流体力学(CFD)方法,采用SST k-ω湍流模型,选取NACA0015水翼并针对不同吸流偏角、不同吸流开口位置、不同吸流比等工况开展定常吸流主动流动控制研究。研究定常吸流对未失速、临界失速、过失速3种不同流动状态下二维水翼剖面升阻力系数的影响,并进一步以过失速流动为例分析其影响机理。数值研究结果表明:合理的定常吸流可以有效抑制水翼的流动分离状态,并改善水翼周围的流场分布,进而改善其升阻特性;定常吸流对NACA0015水翼的增升减阻效果在90°吸流偏角时最好,且关于90°吸流偏角对称;定常吸流的开口位置越靠近水翼前缘,其增升减阻的效果越好,越有利于水翼升阻特性的提升;吸流比越大,定常吸流对水翼升力系数和阻力系数的影响程度越大。
The hydrodynamic performance of the blended-wing-body underwater glider can be improved by opening a hole on the surface and applying the steady suction active flow control.In order to explore the influence law and mechanism of the steady suction active flow control on the lift and drag performance of the hydrofoil,which is the profile of the blended-wing-body underwater glider,based on the computational fluid dynamics(CFD)method and SST k-ωturbulence model,the steady suction active flow control of hydrofoil under different conditions is studied,which include three suction factors:suction angle,suction position and suction ratio,as well as three different flow states:no stall,critical stall and over stall.Then the influence mechanism in over stall flow state is further analyzed.The results show that the flow separation state of NACA0015 hydrofoil can be effectively restrained and the flow field distribution around it can be improved by a reasonable steady suction,so as to the lift-drag performance of NACA0015 hydrofoil is improved.The effect of increasing lift and reducing drag of steady suction is best at 90°suction angle and symmetrical about 90°suction angle,and it is better when the steady suction position is closer to the leading edge of the hydrofoil.In addition,with the increase of the suction ratio,the influence of steady suction on the lift coefficient and drag coefficient of hydrofoil is greater.
作者
杜晓旭
张连营
DU Xiaoxu;ZHANG Lianying(School of Marine Science and Technology,Northwestern Polytechnical University,Xi′an 710072,China)
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2021年第4期801-809,共9页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金面上项目(51979227)资助。
