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对双吸式多翼离心风机进行三维数值模拟,分析蜗壳内部气流组织的演化过程,以及蜗壳、集流器形状,叶轮出流、蜗壳回流气流对气流组织的影响,利用三维流线分析的方法探究了双吸式多翼离心风机蜗舌附近旋涡区产生的机理。在此基础上,在蜗壳180°至270°区域壁面设置整流破涡装置,并对装置的3个尺寸参数进行正交实验。结果表明,优选方案有效破碎蜗壳内大尺度涡旋,并通过影响蜗壳内气流组织,削弱出口回流范围及强度。各工况下整流前后Ps-Qv及η-Qv性能曲线对比表明,整流后流量大于10.58 m~3/min时,出口静压提升明显,风机高效区得到拓宽。
The three-dimensional numerical simulation of the double-suction multi-blade centrifugal fan was carried out to analyze the evolution of air flow in the volute shell and the influence of volute, collector shape, impeller exit flow and volute return air flow on the airflow structure. The method of analysis explores the mechanism of swirl zone in the double-suction multi-blade centrifugal fan near the volute tongue. On this basis, a rectifying and decaying device is set on the wall of the volute at 180 ° to 270 °, and the three dimensional parameters of the device are orthogonally tested. The results show that the optimized scheme can effectively crush the large-scale vortex in the volute and weaken the range and intensity of outlet reflux by affecting the air flow in the volute. The comparison of the Ps-Qv and η-Qv performance curves before and after rectification shows that when the flow rate exceeds 10.58 m 3 / min after rectification, the outlet static pressure increases obviously and the fan high efficiency area is broadened.