S型仿生叶片对可逆多翼离心风机气动性能的影响

Effects of S-type Bionic Blade on Aerodynamic Performance of Reversible Multi-blade Centrifugal Fan

可逆多翼离心风机可直接通过叶轮正反双向旋转实现不同风口的送风。本文以具有快速机动游动特性的鲹科鱼类为仿生原型,设计完成了一种S型仿生叶片,并对带有该S型仿生叶片的可逆多翼离心风机的气动性能进行了数值和实验研究。其中,S型叶片中弧线为两段圆弧反向对接形式,并以叶片进出口角、弧线相切角和中间圆系数作为设计参数进行了正交设计试验。研究结果表明:S型仿生叶片的出口角对正反转的气动性能影响较为显著,且随着出口角大小的改变,正转风量和反转风量呈现此消彼长的趋势;与原型直叶片相比,S型仿生叶片能够有效改善非工作出口侧流动状态,反转时叶轮叶顶侧流动分离得到有效抑制,漩涡强度显著减小。采用优化的S型仿生叶片能够在保证可逆多翼离心风机正转气动性能的同时,反转风量增加10.8%。

The reversible multi-blade centrifugal fan can directly realize the air supply of different outlets through the positive and negative rotation of the impeller.In this paper,a kind of S-type bionic blade is designed based on the bionic prototype of Carangidae fish with fast maneuvering swimming characteristics,and the aerodynamic performance of the reversible multi-blade centrifugal fan with the S-type bionic blade is studied numerically and experimentally.Among them,the middle arc of S-type blade is the form of two arc reverse docking,and the orthogonal test is carried out with the blade inlet and outlet angle,arc tangent angle and middle circle coefficient as the design parameters.The results show that:the outlet angle of S-type bionic blade has a significant effect on the forward and reverse aerodynamic performance,and with the change of the outlet angle,the forward and reverse air flow show a trend of increasing and decreasing;compared with the prototype straight blade,the S-type bionic blade can effectively improve the flow state at the non-working outlet side,effectively restrain the flow separation at the top side of the impeller blade when reversing,and significantly reduce the vortex intensity.The reversing air volume of the reversible multi-blade centrifugal fan with S-type bionic blade increases by 10.8%on the premise of ensuring the forward aerodynamic performance.