The characteristics of flow in a centrifugal impeller with different stagger angle along the blade span and unequally spaced blades were investigated using particle image velocimetry (PIV). Instantaneous and averaged velocity measurements were carried out at the inlet, outlet, inside blade passage, around blade, and around scroll of the centrifugal impeller by synchronizing the passage of the blade with laser and camera system. These measurements revealed detailed flow features at the operating point of the centrifugal impeller with and without scroll. The data from the PIV measurements were used to analyse the performance of the centrifugal impeller.
BhopeD. V.PadoleP. M.Experimental and theoretical analysis of stresses, noise and flow in centrifugal fan impeller. Mech. Mach. Theory, 2004, 39, 1257–1271.
2.
LauchleG. C.Effect of inlet turbulators on backwardscurved impeller noise. In Proceedings of Fan Noise 2003, 2nd International Symposium, Senlis, France, 2003 (available on CD-ROM).
3.
LinS. C.HuangC. L.An integrated experimental and numerical study of forward-curved centrifugal fan. Expl Therm. Fluid Sci., 2002, 26, 421–434.
4.
NeiseW.Review of noise reduction methods for centrifugal fans. J. Eng. Ind., 1982, 104, 151–161.
5.
ChoiY. D.NishinoK.KurokawaJ.MatsuiJ.PIV measurement of internal flow characteristics of very low specific speed semi-open impeller. Expl Fluids, 2004, 37, 617–630.
6.
SticklandM.ScanlonT.WaddellP.Fernandez-FrancosJ.BlancoE.Measurement of rotating flows using PIV and image derotation. Expl Fluids, 2003, 34, 304–306.
7.
GB1236–2000. Industrial fans: performance testing using standardized airways. Chinese National Standard, 2000.
