基于FLUENT的旋风分离器流场数值分析

Numerical Analysis of Flow Field in Cyclone Based on FLUENT

建立循环流化床锅炉机组中三维旋风分离器物理模型,并在Simple算法的基础上,运用RNG k-ε湍流方程,与有限体积法相结合对控制方程做出离散处理,从而完成旋风分离器内部流场模拟。在TMCR、75%TMCR与50%TMCR等3种不同工况下,对旋风分离器入口烟道流速进行计算,然后对其速度场与湍流强度分布状况进行对比分析,最后通过采集现场数据做出进一步的验证。从结果可见:伴随着旋风分离器入口烟道流速的增大,其内部流场分布趋势逐渐平稳。

The physical model of three-dimensional cyclone in a circulating fluidized bed boiler unit is established. On the basis of the simple algorithm, RNG k-ε turbulence equation is combined with the finite volume method to discretize the governing equations, and the simulation of the flow field inside the cyclone is completed. Under different operating conditions, such as TMCR, 75% TMCR and 50% TMCR, the velocity of the cyclone inlet flue is calculated, then the velocity field and the turbulence intensity distribution are compared and analyzed, and finally the field data are collected Further verification. It can be seen from the results that with the increase of the velocity of the inlet flue in the cyclone, the trend of the internal flow field is gradually stabilized.