Research On The Effect Of The Side Shape Of Vortex Blower Impeller Blade On The Performance

It is very complex about the fluid flow inner vortex blower, and so far the research on vortex blower is still being developing. The positions of inlet and outlet of vortex blower impeller passage are very special. Inlet is nearby blade root from axial direction. Outlet is nearby blade tip from two directions (radial direction and axial direction). The cutting of blade side will influence the fluid flow in and out of impeller channel, thus influence the performance of blower. This paper researches the influence of the chamfer of blade side on the performance of vortex blower, starting from suction side and pressure side. It finally finds that both radial straight blade and bending blade (former curved blade and backward curved blade), are the same results that blower performance of chamfer on suction side is better than that of pressure side, and the two situations differ considerably when small flux but approximately when big flux. This paper explains the result of such phenomenon by velocity triangle theory analysis. Using CFD method, this paper analyses contrastively four chamfer casing of radial blades namely suction side, pressure side, both suction side and pressure side, neither suction side and pressure side. The results of CFD are correspondence with experiments, getting conclusion that blade side chamfer can not only change the velocity triangle of inlet and outlet, but serve as inlet collector and reduce the shock loss and wake loss, which has obvious effect when big flux. Finally, this paper carries on optimized design on suction side chamfer of radial blade using CFD method, and it finds that vortex blower has a better performance when it has more chamfering cutting output on blade thickness direction and less chamfering cutting output on blade width direction.