Time-frequency characteristics of smoothed Wigner tri-spectrum slices of nitrogen-water two-phase flow patterns
LI Hong-we · 2013
In order to test the anti-noise ability,inhibition cross-term interference and ability of concentrating energy,the smoothed Wigner-Ville tri-spectrum theory was applied to fractal sequence(Conway),chaotic sequence(Lorenz)and periodic sequence(sine signal).The results showed that the smoothed Wigner-Ville tri-spectrum had obvious advantages in these three aspects of performance compared with other Wigner-Ville spectral theories when it was applied to the analysis of field fluctuation signals.On this basis,the differential pressure signals of nitrogen-water two-phase flow in small rectangular channel were studied.By the analysis of the slice,contour and secondary slice of smoothed Wigner-Ville tri-spectrum of different flow patterns,the evolution of different flow patterns was revealed.At the same time,the smoothed Wigner-Ville tri-spectrum theory could provide a new approach to further revelation of flow mechanism and flow pattern identification of multi-phase flow of different media.