工程科学学报Issue(9)：1191-1197,7.DOI:10.13374/j.issn2095-9389.2015.09.012
自振射流喷嘴振荡腔内信号检测方法
A new detection method of fluid pulsation inside the oscillation cavity of a self-resonating water jet nozzle
摘要
Abstract
To obtain characteristic pressure signals in the cavity of a self-resonating water jet nozzle, a detection system was built by using micro high-responsive pressure sensors. The characteristics of self-resonating water jet were studied and the nozzle’ s structure was designed. The sensors’ layout was determined based on computational fluid dynamics ( CFD) simulation results, and the respon-sive frequency of the sensors was determined according to theoretical calculations of the nozzle’ s self-excited oscillation frequency. The Hilbert-Huang transform was used due to the nonstationarity of pressure signals in the cavity. It is found that the pressure oscillation signals are focused on the frequency band of 40-60 Hz, 110-150 Hz and 200-310 Hz, and each frequency has different fluctuation am-plitudes. Pressure signals near the water outlet reach larger amplitudes with narrow bandwidth.关键词
水射流/喷嘴/振荡腔/涡量/扰动/信号分析Key words
water jet/nozzles/oscillation cavity/vorticity/disturbance/signal analysis分类
信息技术与安全科学引用本文复制引用
韩健,柳靖,汪晖,马飞,蔡腾飞..自振射流喷嘴振荡腔内信号检测方法[J].工程科学学报,2015,(9):1191-1197,7.基金项目
国家自然科学基金资助项目(51274021) （51274021）
