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In order to study the particle dynamics at a relatively low conveying velocity in a horizontal gas-solid two-phase pipe flow, the axial- and vertical-particle fluctuation velocities were measured by the time-resolved particle image velocimetry. Based on the measured particle fluctuation velocities, continuous wavelet transform and one-dimensional orthogonal wavelet transform were applied to reveal...
The wake flow of triangle cylinder was measured by PIV experiment at Reynolds number of 14,440. One dimensional orthogonal wavelet and POD analyses are employed to decompose the fluctuating velocity field into different wavelet components and modes. The reconstructed flow fields are analyzed in terms of fluctuating energy, time frequency distribution, and Reynolds shear stress. It is found that the...
The three-dimensional dune wake flow is evaluated by large eddy simulation at a Reynolds number of 5,534, and validated by time-averaged results of particle image velocimetry measurement at a central streamwise plane. To reveal multi-scale characteristics of vortical structure, the instantaneous velocity, vorticity, and pressure were decomposed into the large-, intermediate- and small-scale components...
The turbulent structure behind a two-dimensional symmetric triangle cylinder is measured by PIV experiment at Reynolds number of 14440. To reveal the possibly existed flow phenomena that buried in the mean flow, one dimensional orthogonal wavelet and POD analyses are employed to decompose the fluctuating velocity field into different wavelet components and modes. The features of reconstructed flow...
PIV experiments of dune wake were first carried out at a Reynolds number of 4660. Then two-dimensional orthogonal wavelet multi-resolution technique was applied to analyze flow structures of various scales. The instantaneous velocity and vorticity were decomposed into the large-, intermediate- and relatively small-scale components by the two-dimensional wavelet multi-resolution technique. The scale...
Based on the multi-source data of protection, breaker and fault recorder is the future trend of fault diagnosis. Firstly, the information fusion in this paper is accomplished on characteristic layer. With the help of wavelet techniques, the firing sequence of Fuzzy Petri net can be treated. The substation fault diagnosis results as well as evaluation of the operations of protections and breakers are...
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