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对圆筒型、渐缩型和渐扩型排气结构的导叶式旋风管分离器的压力损失和分离效率进行数值研究。在数值预测时,气相场采用雷诺应力模型,应用随机轨道模型来模拟湍流场中颗粒运动轨迹。给出了不同排气管附近流动特性,计算短路流情况。结果表明,随着排气管下口直径缩小,旋风管内部切向速度增大,有利于分离效率提高,但同时增加旋风管阻力;排气管喇叭口结构利于气流其内部流动,且能够降低旋风管阻力。同时,也说明了应用计算流体力学来研究旋风管内部气固两相流动规律的可行性。
The pressure loss and separation efficiency of the guide vane cyclone separator with cylindrical, tapered and divergent exhaust structures were numerically investigated. In the numerical prediction, the gas field uses the Reynolds stress model and the random orbit model is used to simulate the particle trajectory in the turbulent flow field. The flow characteristics of different exhaust pipes are given and the situation of short circuit flow is calculated. The results show that as the diameter of the lower exhaust pipe decreases, the tangential velocity in the interior of the cyclone increases, which improves the separation efficiency and at the same time increases the resistance of the cyclone pipe. The structure of the exhaust pipe trumpet facilitates the internal flow of the gas and can reduce Cyclone resistance. At the same time, it also shows the feasibility of using CFD to study the gas-solid two-phase flow in the cyclone tube.