Study on numerical simulation of pneumatic conveying system under pulsed jet
The computational fluid dynamics(CFD)and discrete element(CFD-DEM)coupling methods are used to simulate the original pipeline and the pipeline equipped with jet generator,and the motion state of parti-cles is studied by changing the air velocity,jet position,jet velocity and jet frequency.The results reveal that when the pulsed jet is utilized,the kinetic energy of particles at the pipe outlet increases significantly,the parti-cles change from the bottom drag movement of the pipe to the suspension movement of particles,and the energy conversion rate of the transportation system also increases significantly.The frequency spectrum analysis and continuous wavelet transform analysis are carried out to analyze the velocity of particles at different positions in the pipeline,the results exhibit that the jet can effectively regulate the periodicity of particle movement in the pipeline,slow down the development of particle longitudinal velocity in the pipeline,and convert more energy into the particle axial velocity required by the conveying system,thus reducing the energy consumption of the pneu-matic conveying system.
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