旋风流场的导流与整流

针对环流式旋风除尘器分离区内存在影响分离效率的涡流与非理想流动情况,提出在旋风除尘器内增设导流件以改进其性能,利用CFD大型流体模拟软件F luent6.2提供的雷诺应力模型(RSM)进行了数值模拟研究,优化了导流件结构,并进行了实验验证。模拟结果表明:增设导流件后,环流式旋风除尘器一次分离区内气流旋转更加规整,气流旋转圈数增加,流体的切向速度增大,有利于粉尘分离。实验结果证明:添加导流件后,除尘器分离效率由94%左右提高至96%左右,设备压降略有增加。

Guiding and commutating of cyclone flow field

Viewing that the eddies and nonideal fluids affecting the separation efficiency exist in the separation field of circumfluent cyclone,the guide vane was added in the circumfluent cyclone so as to improve its performances.The numerical simulation was performed by using Reynolds stress model(RSM) with the computational fluid dynamics(CFD) software Fluent 6.2.The structure of guide vane was optimized,and the experiment was validated.The simulation results show that the flow rotation is more regular in the primary separating field of circumfluent cyclone,and the number of flow rotation and tangential velocity increase after adding the guide vane.These are beneficial to separate dust.The experiment results show that the separation efficiency is increased from 94% to 96% after adding the guide vane.The pressure drop of circumfluent cyclone increases slightly.