Numerical study on the characteristics of natural supercavitation by planar symmetric wedge-shaped cavitators for rotational supercavitating evaporator  

作　　者：ZHENG ZhiYing LI FengChen LI Qian KULAGIN Vladimir A 

机构地区：[1]School of Energy Science and Engineering,Harbin Institute of Technology [2]Department of Heat Technology and Fluid Dynamics, Siberian Federal University

出　　处：《Science China(Technological Sciences)》2015年第6期1072-1083,共12页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51276046);Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20112302110020)

摘　　要：With the application of supercavitation effect, a novel device named rotational supercavitating evaporator(RSCE) was recently designed for desalination. In order to improve the blade shape of rotational cavitator in RSCE for performance optimization and then design three-dimensional blades, numerical simulations are conducted on the supercavitating flows(with cavitation number ranging from 0.055 to 0.315) around two-dimensional planar symmetric wedge-shaped cavitators with different wedge angles varied from 10 to 180 degrees. Proper numerical method for simulating supercavitating flows around planar symmetric cavitator is established, and assessment of k-ε-v2 -f turbulence model in simulating cavitating flows is conducted. It shows that the size of computational domain would affect the simulation result. Empirical formulae for supercavity dimensions about cavitation number at different wedge angles are obtained, which are of significant importance in the subsequent design of three-dimensional blade. The characteristics of resistance at different wedge angles are discussed, which, together with the characteristics of supercavity dimensions, play important roles in the optimal design of RSCE.

关 键 词：rotational supercavitating evaporator desalination planar symmetric wedge-shaped cavitators CFD numerical simulation 

分 类 号：P747[天文地球—海洋科学]