Aerodynamic Tests on a Centrifugal Fan Impeller Model with Swept-Back Blades.
Mechanical engineering rept.,
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF MECHANICAL ENGINEERING
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Experiments were carried out on the NRC Low Speed Centrifugal Compressor Rig on a 4-foot - 1012-inch diameter model of a fan impeller with highly swept-back vanes. The impeller was run over a range of speeds and throttle settings to explore the whole operating field. The flow was measured at inlet and impeller exit by hot-wire anemometer traverses, and motion pictures of the flow were made using smoke visualisation. The flow through the impeller is described in detail, and is compared with that in other types of impeller investigated on the same test rig. A comparison is also made with the flow in a geometrically similar impeller tested in the water tunnel at Waterloo University, and reported by Howard and Lennemann. The correspondence between the flows seen in these two experiments is shown to be very close. Author
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