摘要：基于欧拉-拉格朗日模型, 对催化裂化烟气轮机内部气固两相流动特性进行数值研究;采用k-ε湍流模型和离散相模型对不同粒径颗粒在烟气轮机内的运行规律进行模拟。结果表明:烟气流道内气相速度和压力的分布是导致固相颗粒与叶片表面发生碰撞和沉积的主导因素;在动叶压力面内, 粒径大于5μm的颗粒更容易与叶片表面发生碰撞, 且随着粒径的增大颗粒更倾向于和叶片底部发生碰撞。

关键词：烟气轮机；颗粒粒径；运动规律；数值研究

Abstract：Based on Euler-Lagrangian model, the numerical study of gas-solid flow characteristics inside FCC flue gas turbine was presented. Using k-ε turbulence model and discrete phase model, movement rules of different size particles in the flue gas turbine were simulated. The results show that the distribution of gas flow rate and pressure in flue gas flow passage are dominant factors causing to the occurrence of collision and deposition of solid particles on the blade surface. On the pressure surface of rotor blade, particles that are larger than 5 μm of particle size are easier to collide with the surface of the blade. With increase of the particle diameter, the tendency of particles collides with the bottom of blade increasing.

Keywords: flue gas turbine；particle size；movement rule；numerical study