NASA STI Repository (National Aeronautics and Space Administration) · 1978 · 33 citations · 0 references
EngineeringArchitectural EngineeringAcoustic DesignAerodynamicsPerformance-based DesignAcoustic PerformanceAerodynamic DesignFan PerformanceNoise Reduction DesignAerodynamic Efficiency DesignBlade Element TheoryDamper SystemsDesign SpeedFan Energy EfficiencyFan System PerformancePressure - Flow Characteristics
The aerodynamic design and the overall and blade-element performances are presented of a 427-meter-per-second-tip-speed two-stage fan designed with axially spaced blade rows to reduce noise transmitted upstream of the fan. At design speed the highest recorded adiabatic efficiency was 0.796 at a pressure of 2.30. Peak efficiency was not established at design speed because of a damper failure which terminated testing prematurely. The overall efficiencies, at 60 and 80 percent of design speed, peaked at approximately 0.83.