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Showing 1 to 6 of 6 for “"Fan aerodynamics"”.
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Variable pitch fan aerodynamics
Variable pitch fans could enable reduced fuel burn, low fan pressure ratio turbofan engines by extending fan stage operating range and reducing weight and drag by eliminating thrust reversers. The work in this thesis looks to further understanding of the aerodynamic performance of variable pitch …
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Ducted Fan Aerodynamics and Modeling, with Applications of Steady and Synthetic Jet Flow Control
Ducted fan vehicles possess a superior ability to maximize payload capacity while minimizing vehicle size. Their ability to both hover and fly at high speed is a key advantage for information-gathering missions, particularly when close proximity to a target is essential. However, the ducted fan's …
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Effects of blade damage on low pressure ratio fan windmill aerodynamics
… can occur after the in-flight shutdown of a turbofan, when the fan continues to spin due to the aircraft forwards speed. This condition leads to high levels of drag, and the fan operates at very low rotational speeds. Windmill often follows damage to the fan, which will lead to large …
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Installation Effects on Variable Pitch Fans
Future low pressure ratio fan systems require an extended operating range and variable pitch fans can achieve this by re-pitching the rotor blades. Moreover, a variable pitch fan has the potential of reducing fuel burn if sufficient reverse thrust can be generated, such that the engine weight and …
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Parametric Study of Aerodynamic Performance of an Airfoil with Active Circulation Control Using Leading Edge Embedded Cross-Flow Fan
<p>A concept of a cross-flow fan (CFF) embedded near the leading edge of an airfoil to actively control the boundary layer for lift and thrust enhancement has been proposed. The design places a cross-flow fan near the leading edge of an airfoil and flow is drawn in from the pressure side of the …
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Towards a silent fan: an investigation of low-speed fan aeroacoustics
The noise (unwanted sound) from fans of all sizes, operating in close proximity to people, can be a design constraint due to annoyance or, in the worse cases, health damage. Of the total noise, aeroacoustic noise – produced by unsteadiness in the air – often represents a significant source and is …