自由液面对NACA0012翼型流体动力特性影响研究  

Free Surface Effects on the Hydrodynamic Characteristics of NACA0012

作　　者：刘钊 黄闯[1] 杨昊 贺旭 党建军[1] LIU Zhao;HUANG Chuang;YANG Hao;HE Xu;DANG Jianjun(School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《水下无人系统学报》2023年第3期365-372,共8页Journal of Unmanned Undersea Systems

基　　金：国家自然科学基金项目资助(51909218);水下信息与控制重点实验室开放研究项目资助(2021JCJQLB03007);中央高校基本科研业务费专项资金资助(D5000220168)。

摘　　要：跨介质航行器在跨越水空介质运动时,自由液面对航行器机翼有较大的影响,为总体设计和航行控制带来挑战。为了探究机翼从空中和水下远场接近自由液面过程的流体动力特性变化,以NACA0012翼型为例,采用计算流体动力学方法,基于流体体积多相流模型建立机翼从空中和水下接近自由液面的流场数值仿真模型,验证了模型的可行性,研究了机翼工作在自由液面附近时的流体动力特性。结果表明:机翼以正攻角从空中远场接近自由液面的过程中,阻力系数逐渐减小,升力系数和升阻比都逐渐增大;机翼从水下远场接近自由液面的过程中,升力系数和升阻比均逐渐减小,当距离超过10倍弦长时,阻力系数因兴波作用逐渐增大,当距离小于10倍弦长时阻力系数则迅速减小。研究结果可为跨介质航行器的总体设计和航行控制提供参考。When a transmedia vehicle moves across water and air media,the free surface has a great influence on its airfoil,which brings challenges to the overall design and navigation control.To investigate the hydrodynamic characteristics of anairfoil approaching the free surface from the far field in the air and water,numerical simulation models of this process wereestablished for a NACA0012 based on a volume of fluid multiphase flow model using computational fluid dynamics.Thefeasibility of the models was verified,and the hydrodynamic characteristics of the airfoil working near the free surface werestudied.The results showed that the drag coefficient decreased gradually while the lift coefficient and lift-to-drag ratioincreased as the airfoil approached the free surface from the far field in the air at a positive angle of attack.The lift coefficientand lift-to-drag ratio both decreased gradually when the airfoil approached the free surface from the underwater far field.Whenthe distance was more than 10 times chord length,the drag coefficient increased gradually because of wave-induced action,and the drag coefficient decreased rapidly when the distance was less than 10 times chord length.These results can providereference for the overall design and navigation control of transmedia vehicles.

关 键 词：跨介质航行器 自由液面 流体动力特性 机翼 

分 类 号：U661.1[交通运输工程—船舶及航道工程] TJ630.2[交通运输工程—船舶与海洋工程]