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NUMERICAL CALCULATIONS FOR two-phase JET flow OF A MIXTURE OF PULVERIZED-COAL AND gas

Acta Mechanica Sinica 1985年第1期1卷 37-48页

作者： Guo Bentie Fan Zhengqiao Zhang Benzhao Ding Jianmin (Department of Mechanics,Zhejiang University) Department of Mechanics Zhejiang University Zhejiang China

In this paper,Euler-Lagrange type equations are used to describe the jet flow of a mixtureof pulverized-coal and gas,which is an unsteady axisymmetric two-phase *** means of the fini-te-difference method,the coal particle’s distribution,velocity and trajectory in the flow field *** coal particles are represented by a finite number of computational *** par-ticle’s diameter is randomly assigned according to a given distribution,The states of the computation-al particles are different from each *** is accounted for in a stochastic ***-cit time-splitting scheme is used to calculate the strongly coupling interphase *** numericalresults are *** comparison between the numerical results and the experiment data for thecase of the oil droplet injection shows good *** numerical technique can be extended tothe calculation of other two-phase flows of dilute particles or a droplet system.

关键词： gas-particle two-phase flow pulverized-coal injection gas injection

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Direct numerical simulation on the particle flow in the wake of circular cylinder

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Progress in Natural Science:Materials International 2003年第5期 61-66页

作者： CEN Kefa China Institute of Thermal Power Engineering Zhejiang University. Hangzhou 310027

The spectral-element approach is used to simulate the gas-solid two-phase flow behind of the circular cylinder. Based on the method of a high accuracy calculation for the gas phase flow, the particle dynamic field is put into practice. two key influence factors, Stokes number and Reynolds number, are investigated. The simulation results give a clear pattern of the physical characteristics of gas-particle flow. Due to the construction properties of the eddies in the wake of the circular cylinder, the suction is the main dispersion mechanism of particles near to the centric axis. This effect can make the small particle sucted to the near wake of the circular cylinder. The particle dispersion is also induced by the pressure gradient which is caused by the strong velocity gradient of gas phase.

关键词： direct numerical simulation gas-particle two-phase flow circular cylinder.

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