摘要
通过实验,使用高频水听器采集3种常用不同结构空化喷嘴产生的空化噪声信号,选取其中的信号,以Takens定理为基础,进行相空间重构,并分别计算其最大Lyapunov指数值。实验对空化喷嘴的混沌特性进行辨识以及比较分析,为空化喷嘴的设计、检测提供了一种新的途径。在采用的实验条件下,选取的空化噪声信号的最大Lyapunov指数值大于零,即这些信号都是混沌信号。实验显示,具有自激振荡腔结构喷嘴的最大Lyapunov指数值最大。
The mechanism of hydraulic cavitation is far from known for the complexity of itself, The core of the technology of hydraulic cavitation is the cavitation nozzle. Researches show that cavitation phenomenon displays some chaotic properties. On this basis, the cavitation noise signals, which are produced by the common cavitation nozzles in different shape, are collected by hydrophone experimentally. The state spaces of some selected signals are built on the base of taken theorem, and their largest Lyapunov exponents are calculated. This experiment identifies and compares the chaotic properties of cavitation nozzle, and presented a new method for the design and the test of cavitation nozzles. Under this experimental condition, the result displays that the largest Lyapunov exponents of these selected cavitation noise signals are larger than O, which means that these signals are all chaotic signals. The largest Lyapunov exponent of the nozzle with self-oscillating cavity is the largest of the three.
出处
《湖南工业大学学报》
2007年第4期65-68,共4页
Journal of Hunan University of Technology
基金
国家自然科学基金资助项目(50504021)
湖南省教育厅基金资助重点项目(04A067)
关键词
空化喷嘴
空化噪声
水射流
相空间
混沌
cavitation nozzle
cavitation noise
water jet
state space
chaos
作者简介
刘江辉（1977-），男，湖南新邵人，湖南工业大学硕士研究生，主要研究方向为水射流理论．
