摘要
为了探讨浸没循环撞击流混合器撞击区非线性和混沌特性,引入不同测度多重分形分析的方法,用小波变换模极大值与多重分形测度分析方法相结合,检测混合器撞击区压力波动信号奇异性并得出多重分形奇异谱.结果显示奇异谱基本呈单峰形状,表明混合器中压力波动信号具有明显的多重分形特性,且Holder指数大概分布在0.5～3.5之间,其中,撞击区的径向范围r≤20mm的Holder指数分布大于1.0的较多,表明撞击区内的信号奇异性增强,撞击区的径向范围为r≤20mm.
In order to understand the intrinsic features of heterogeneity, non-linearity and chaotic behavior of fluid system in an impinging stream mixer, the wavelet transform modulus maxima method and multi-fractal measurement analysis were presented to describe the heterogeneity features of the pressure fluctuation in the impinging area. Based on the method, the multi-fractal singularity spectra of pressure fluctuation signals were measured in the impinging stream mixer. The multi-fractal characteristic of pressure fluctuation signal is shown in the impinging stream mixer and the exponent H values are from 0.5 to 3.5, whereas H〉1.0 is shown with r≤20 mm. Thus, r≤20 mm is considered as the radial limitation in the impinging area.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2006年第4期627-632,共6页
The Chinese Journal of Process Engineering
关键词
信号处理
湍流
撞击流
压力波动
多重分形
小波变换
奇异谱
signal processing
turbulent flow
impinging stream
pressure fluctuation
multi-fractal
wavelet transform
singularity spectrum
