John Mizisin, Donald J. Michel
The passage contour of a 48-inch centrifugal compressor was modified by changing the shape of the hub to control deceleration rates along the blade surfaces in order to improve the internal efficiency of the impeller. A comparison of internal-flow characteristics at design flow rate was made with the original impeller and with a previously investigated modified-blade impeller that had the same area variation on the passage. In addition, flow characteristics of the modified-hub impeller over a flow range from maximum flow to near surge at a corrected tip speed of 700 feet per second are presented.
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