• TRANSPORT PHENOMENA & FLULD MECHANICS • 上一篇 下一篇
欧阳洁a,b; 李静海b; 孙国刚c
OUYANG Jiea,b; LI Jinghaib; SUN Guogangc
摘要: In this paper, the stochastic particle-trajectory model is proposed for simulating the
dynamic behavior of circulating fluidized bed (CFB). In our model, the motion of solid
phase is obtained by calculating the individual particle trajectory while gas flow is
obtained by solving the Navier-Stokes Equation including two-phase interaction.For the
calculation of solid phase, the motion of each particle is decomposed into a collision
process and a suspension process. In suspension process, the less important and/or unclear
forces are described as a random force considering gravity, drag force and pressure
gradient. As a result, the proposed model gives some numerical simulations of CFB.It
indicates that the stochastic particle-trajectory model can be used to simulate
qualitatively the annulus-core structure of CFB and the influences of stochastic factors
cannot be ignored. In a CFB, the coupling of stochastic factors between two phases makes
the radial voidage decreased. Moreover, the upward motion of particles is mitigated by both
stochastic factors and turbulence between two phases.