实验流体力学2011，Vol.25Issue(2)：22-28,7.
绕平头回转体非定常空化流体动力特性研究
Study on the unsteady cavitating flow dynamic characteristics around a O-caliber ogive revolution body
摘要
Abstract
The unsteady characteristics of cavitating flows around a O-caliber ogive revolution body are investigated by experimental methods. Experiments are carried out in a rectangular test section of a cavitation tunnel. A high-speed video camera and dynamics force measurement system are used to observe the unsteady cavitating flow patterns and the resistance of the O-caliber ogive revolution body, under different cavitation conditions. The cavity size and resistance data are analyzed in time and frequency domain. The time-frequency characteristics of unsteady cavitating flows around the O-caliber ogive revolution body are obtained. The results show that the cavity development and corresponding dynamic characteristics has obviously changed under different cavitation numbers. When the cavitation number is 1.20～ 1.05, the unstable cavitation oscillation region can be only observed in the back of body head, and the resistance coefficient of fluctuates irregularly with time. When the cavitation number is decreased to below 0.75, a periodic shedding process can be observed and the typical characteristics of frequency are captured. The fluctuations of the resistance coefficient increase with the decrease of cavitation numbers.关键词
空化/回转体/时域分析/频域分析/非定常流Key words
cavitation/ revolution body/ time domain analysis/ frequency domain analysis/unsteady flow分类
数理科学引用本文复制引用
黄彪,王国玉,权晓波,张敏弟..绕平头回转体非定常空化流体动力特性研究[J].实验流体力学,2011,25(2):22-28,7.基金项目
国家自然科学基金项目资助(50979004) （50979004）
