Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Leading-edge radius"”.
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Experimental Investigation of Shock-Shock Interactions over a 2-D Wedge at M = 6
The effects of fin-leading-edge radius and sweep angle on peak heating rates due to shock-shock interactions were investigated in the NASA Langley Research Center 20-inch Mach 6 Air Tunnel. The fin model leading edges, which represent cylindrical leading edges or struts on hypersonic vehicles, were …
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Effects of Duct Lip Shaping and Various Control Devices on the Hover and Forward Flight Performance of Ducted Fan UAVs
… shapes were tested to determine the effects of leading edge radius of curvature and duct wall thickness. It was found that a lip with a small leading edge radius performed best in forward flight and crosswind conditions, while the performance of a lip with a large leading edge radius was …
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Heat transfer modeling of jet vane Thrust Vector Control (TVC) Systems
… configurations studied, consisted of a simple wedge and a blunt bodied vane, with a leading edge radius of 1.016 mm (1/25 in.) These models were examined in a two dimensional, sonic and subsonic, cold flow field, for both laminar and turbulent flow cases. Results consist of a numerical solution …
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An analytical investigation of the effect of blade profile variations on the erosion of coal-fired turbine blades
… Maximum erosion was found to be at the trailing edge of the stator and rotor and at the leading edge of the rotor. The trailing edge erosion of the stator and rotor was decreased as the blade exit angle was decreased. The trailing edge erosion of the stator and rotor was also decreased when the …
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Experimental studies in a supersonic through-flow fan blade cascade
… at off-design conditions. Analysis of the leading edge shock shows that the leading edge radius is a major source of losses in STFF blades. Losses from the leading edge bluntness are convected downstream into the blade wake, and are difficult to distinguish from viscous losses. Shock losses …
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An Improved Streamline Curvature Approach for Off-Design Analysis of Transonic Compression Systems
… blade section loading (flow turning), solidity, leading edge radius, and suction surface profile. Other improvements included incorporation of loading effects on the tip secondary loss model, use of radial blockage factors to model tip leakage effects, and an improved estimate of the blade …
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Real Airfoil Effects on Leading Edge Noise
… determine the effects of angle of attack on the leading edge noise. Measurements are compared with numerous theories to determine the mechanism driving the production of leading edge noise. Calculations were also made using a boundary element method to determine the effects of airfoil shape on …
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The relationship between surface geometry and transonic intake performance during off-design climb
… the front-lip shape is optimised to a small nose-radius (equivalent to large highlight curvature) and generally thin profile, the diffuser shape becomes an important consideration. An "s-shaped" diffuser with a large peak surface angle promotes minimal \(\delta_i^*\). Intake performance generally …