Abstract
Flow in a blower casing which has no diffuser part and large tongue clearance was studied. The factors which resulted in good pressure recovery on the branching streamline of main flow from scroll to exit duct were investigated by flow visualization using oil-film and depth-tuft methods. In the main flow, swirling flow which produces centrifugal force pressing the flow against the wall was observed. On the bottom plate, an inward flow pattern resembling that of free vortex flow sinking into its center was observed. This means that low-speed fluid near the wall is drawn into the space between impeller and casing. In the section between scroll and exit duct, a wall branching streamline separating the inward flow and exit flow boundary layes was observed. Thus the boundary layer of the exit flow was thin where flow was decelerated. It is concluded that centrifugal force produced by secondary flow and boundary layer suction are the main causes of high pressure recovery.
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