| Abstract | An experimental investigation of the flow in centrifugal impellers has been in progress in the Engine Laboratory since 1963. It has become clear that the detachment of flow from the blade surfaces is one of the major influences on the poor distribution and stability of flow in the impeller channels. After a general exploration of this flow detachment, reported in Lab. Memo. NRC-ENG-62 (Ref. 1), it was concluded that slotted blades were the most promising means of delaying instability and flow detachment as flow-rate through the impeller was reduced.
Further experiments on an isolated blade in a static wind tunnel were carried out from mid-1969 to the end of 1970, to establish the optimum slot configuration for this application. This work is reported in NRC-ENG-68 (Ref. 2).
Since that date, comparative experiments on three sets of blading, without and with slots, have been carried out in an actual rotating impeller on the Low Speed Centrifugal Compressor Rig, These experiments are reported in the present Memo. |
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