摘要
为了研究叶轮出口后气流角α_(2)'在离心通风机蜗壳型线计中的作用,本文选取一台离心风机样机,建立了该风机的三维模型,并使用计算流体动力学(CFD)的方法,分析了不同叶轮出口后气流角α_(2)'绘制的蜗壳型线对离心风机的性能的影响。结果表明,在蜗壳宽度B与叶轮出口宽度b2确定的情况下,气流角α_(2)'=5.75°型线的风机蜗壳扩压能力最好,但α_(2)'=5°蜗壳型线的通风机工况范围能够满足设计要求,且最高效率点也与设计点重合。因此,应存在最优的叶轮出口后气流角α_(2)',其设计出的离心风机蜗壳型线使风机具有更高的效率和良好的扩压能力。CFD方法在离心风机设计中具有一定的指导作用,可为高效率的离心风机参数优化及设计提供一些参考依据。
In order to study the effect of flow Angleα_(2)'at impeller outlet on volute profile design of centrifugal fan,in this paper,a prototype centrifugal fan was selected to establish a three-dimensional model.The method of computational fluid dynamics(CFD)is used to analyze the influence of volute profile designed with different air flow Angleα_(2)'at impeller outlet on the performance of centrifugal fan.When the width B of the volute and width b2 at impeller outlet keep unchanged,volute with a flow angle ofα_(2)'=5.75°has the best compression capacity.But the operating range of volute with a flow angle ofα_(2)'=5°satisfies the design requirements well,and the most efficient point coincides with the design point.Thus,optimum gas flow angle at impeller outletα_(2) exists,from which volute profile can be designed to make centrifugal fan has the best efficiency and excellent pressure raising capacity.CFD plays guiding role in centrifugal fan design,and can be expected to provide a reference and basis in parameter optimization and design for the centrifugal fan with high efficiency.
作者
林静祥
徐纵
Lin Jingxiang;Xu Zong(Hualu Engineering&Technology Co.,Ltd,Xi'an 710065,China)
出处
《化工设备与管道》
CAS
北大核心
2022年第5期77-82,共6页
Process Equipment & Piping
