防涡圈对离心风机性能的影响

摘要

由于离心风机蜗壳形状和大小的限制,蜗壳内流场存在大量的旋涡和二次流,而这正是造成离心风机效率低、噪声高的主要原因。应用计算流体动力学的商用软件Numeca,对某型离心风机在不同工况下的流场做了整机三维数值模拟,并通过对加装防涡圈前后流场的对比,分析了防涡圈对风机内部流场的影响,探索了防涡圈改善离心风机性能的机理。研究结果表明：防涡圈对于破碎大尺度旋涡和降低旋转强度以及改善离心风机内部流场具有很好的效果。%As the constraints of the shape and size of volute,there is a large number of vortex and secondary flow in the flow field of a centrifugal fan,which is the main reason for low efficiency and high noise.We present three-dimensional numerical simulation of a whole centrifugal fan of a certain type in different conditions,using the CFD commercial software Numeca.We analysed the impact of anti-vortex ring on centrifugal fans′ internal flow before and after the installation of anti-vortex ring.We explored how the anti-vortex ring improved the centrifugal fan performance.The results show that the anti-vortex ring has a good effect for breaking large scale vortices,reducing the crushing strength and improving the rotation within the flow field.