中文摘要：

通过FLUENT6．1流体计算软件，采用改进的各向异性的RSM模型，对直径300mm的蜗壳式旋风分离器，在入口气速20m／s条件下，对293-1273K的气相流场进行了数值模拟．模拟结果与实验数据吻合较好，表明温度变化对旋风分离器的流场有较大影响，尤其是对切向速度影响很大．旋风分离器内气相流场的切向速度随温度的升高而降低，同时强制涡区扩大，沿轴向的衰减增大，两者的关系式为ΔVt／Vt^0=k√λH/D．当温度超过1000K，切向速度降低幅度趋于减小．由于温度升高导致气流的旋转强度下降而使下行的轴向速度略有降低，上行的轴向速度略有升高．温度变化引起气体粘度和切向速度的变化而影响旋风分离器的分离性能，当温度达到1273K时，气体粘度增大使切割粒径dp50T增加1．58倍，而切向速度降低使切割粒径dp50T增加1．23倍，切向速度与气体粘度的作用是同等重要的．

英文摘要：

In the temperature range from 293 K to 1273 K and the inlet gas velocity at 20 m/s, the flow field in a volute cyclone separator with 300 mm diameter has been numerically simulated using a modified non-isotropy RSM model on the platform of commercial CFD software package, FLUENT 6.1. The predicted results are in agreement with the experimental data. The computational results show that temperature increase affects gas velocity vector much, especially tangential component. The temperature increase results in the tangential velocity decrease. This tendency, however, becomes smooth when the temperature is above 1000 K. The correlation between tangential velocity and temperature is expressed as ΔVt/Vt^0=k√λH/D. The influence of temperature on the axial velocity can contribute to the change of rotation intensity of the tangential velocity. The downward axial velocities decrease when the rotation intensity becomes smaU at high temperatures, but the upward ones increase a little. The increase of temperature affects the separation performance of cyclone separator by changing the gas viscosity and tangential velocity. When temperature is to 1273 K, the increase of gas viscosity increases the cut-size diameter 1.58 times and the decrease of gas tangential velocity increases the cut-size diameter 1.23 times. The effect of gas tangential velocity on the separation performance of cyclone is approximately equal to the effect of gas viscosity.