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  • AERODYNAMICS  (2)
  • 1
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    Unknown
    Compressor operation with one or more blade rows stalled (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: High pressure-ratio multistage axial flow compressor operation efficiency with one or more blade rows stalled - performance prediction
    Keywords: AERODYNAMICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Performance of a highly loaded two stage axial-flow fan (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A two-stage axial-flow fan with a tip speed of 1450 ft/sec (442 m/sec) and an overall pressure ratio of 2.8 was designed, built, and tested. At design speed and pressure ratio, the measured flow matched the design value of 184.2 lbm/sec (83.55kg/sec). The adiabatic efficiency at the design operating point was 85.7 percent. The stall margin at design speed was 10 percent. A first-bending-mode flutter of the second-stage rotor blades was encountered near stall at speeds between 77 and 93 percent of design, and also at high pressure ratios at speeds above 105 percent of design. A 5 deg closed reset of the first-stage stator eliminated second-stage flutter for all but a narrow speed range near 90 percent of design.
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-3076 , E-7851
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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