Abstract
A sirocco fan is a centrifugal fan with a forward curved blade. It is used for low pressure but has a large discharge use. In this paper, at first, nine impellers with various blade shapes were tested in the same casing. The measurements of the three-dimensional time variant velocity at the outlet of the impeller were done using four impellers having better performances among them. The relations between fan performance and outlet velocity were considered. The effects of the blade shape on the performance were considered. The blade inlet and outlet angles and blade inclination angles which have the best performance were considered. The design parameters of designing a sirocco fan impeller was described.
Highlights
A sirocco fan is a centrifugal fan with a forward curved blade. It is used for low pressure but has a large discharge use
At first, nine impellers with various blade shapes were tested in the same casing
Raj and Swim (1981) reports that the flow velocity through a sirocco fan to be larger on the pressure surface, i.e., the jet region, and smaller on the suction surface, i.e., the wake region
Summary
A sirocco fan is a centrifugal fan with a forward curved blade. It is used for low pressure but has a large discharge use. The outlet port of this fan may have a rectangular shape and it is sometimes contained in air conditioning apparatus. A forward-curved vane can give large momentum to the fluid, but it cannot make for better efficiency. According to the measured results by Kadota et al (1986) and Kawaguchi et al (1994) on the flow in the neighborhood of the outlet of a moving blade, uniform flow cannot be obtained because of a sudden turning of the inlet flow. Yamazaki and Sato (1986) and Nakajima et al (1986, 1988) found a large vortex on the shroud side. Totsuka et al (1996) showed that the occurrence of turbulence is sometimes
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