Wavelet Multi-fractal Singularity Spectrum:Application to Pressure Fluctuation in an Impinging Stream Mixer
Jiao Li · Guocheng gongcheng xuebao · 2006
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 H1.0 is shown with r≤ 20 mm.Thus,r≤20 mm is considered as the radial limitation in the impinging area.