摘要
本文采用高速全流场显示技术和粒子图像测速系统(PIV)实验方法讨论了绕不同涂层水翼片状空化流动结构、运动特性的影响。结果表明:涂层的粗糙度和材质共同影响绕水翼片状空化流动结构和运动特性。实验中观察流动结构,发现粗糙表面比光滑表面更易于出现片状空化,氟碳涂层比环氧涂层更能够抑制片状空化;运动特性方面,表面粗糙度与涂层材质相比较,材质对片状空化的运动特性影响更大:表面光滑的氟碳涂层的低速区最小且区内速度波动也最弱,但区内的涡量分布更为集中;不同涂层造成水翼表面速度旋涡的位置不同,导致空穴脱落的位置不一样,空穴发展长度不同。
High-speed video and particle image velocimetry（PIV） technique are combined to carry out the flow structure and kinetic characteristics of sheet cavitation around three different coating hydrofoils and discuss the influence of different coatings. The results show three main phenomena.Firstly, coatings＇ roughness and material both effect on the flow structure and kinetic characteristics.For different coatings, restriction on sheet cavitation generated by fluorocarbon coating is stronger than epoxy coating, and rough surface is weaker than the smooth. Coating effects on the kinetic characteristics of sheet cavitation. Compared with roughness, material of coating has more obvious effect on the kinetic characteristics of sheet cavitation. When in the sheet cavitation, for smooth surface fluorocarbon coating, the length of cavitation and the area of low-speed region is the smallest,while the distribution of vorticity in the low-speed region is most concentrated. Different coatings have different position of vortex, leading to different, position of collapse and different length of cavity.
作者
郝加封
张敏弟
付细能
HAO Jia-Feng;ZHANG Min-Di;FU Xi-Neng(School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China;Hongdu Aviation Industry Group, Nanchang 330024, China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第7期1481-1487,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51106009)
关键词
涂层
空化
实验研究
水翼
流动特性
coating
cavitation
experimental study
hydrofoils
flow characteristics
