PERFORMANCE OF A 1.15-PRESSURE -RATIO AXIAL-FLOW FAN STAGE WITH A BLADE TIP SOLIDITY OF 0. 5

摘要

The overall and blade-element performance of a low-solidity, low-pressure-ratio, low-tip-speed fan stage is presented over the stable operating range at rotative speeds from 90 to 120 percent of design speed. At design speed a stage peak efficiency of 0. 836 was obtained at a weight flow of 30.27 kilograms per second (177. 80 (kg/sec)/m ² of annulus area) and a pressure ratio of 1.111. The pressure ratio was less than design pressure ratio, and the design energy input into the rotor was not achieved. A mismatch of the rotor and stator blade elements resulted due to the lower than design pressure ratio of the rotor.