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 6 of 6 for “"advance ratio"”.
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A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs)
… to better understand the physics behind the operation of these turbines. Specifically, the effect of advance ratio, solidity, and wake interactions were investigated. Simulations were completed in OpenFOAM using the k-ω SST turbulence model at a nominal Reynolds number of 500,000 using a NACA …
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A linear parameter varying control methodology for reduction of helicopter higher harmonic vibration
Vibration in helicopters can have a significant impact on their utility, maintenance, weight, performance, and cost of operation. This thesis focuses on the design of a vibration reduction controller that is effective throughout the flight envelope of the helicopter, in spite of variations in …
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Unconventional Swept Rotor Design using Open Vehicle Sketch Pad (OpenVSP)
… rotors exhibit decreased performance at lower advance ratios. However, as the speed or advance ratio increases, the overall performance of swept rotors significantly improves. This conclusion is drawn from the load distribution data obtained for each blade of the rotors, and by comparing the …
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Experimental investigation of turbulent flow in the near wake of a propeller
… was conducted in the VPI Stability tunnel at an advance ratio of 0.95 in a uniform free stream at 20 ft/s (6.1 m/s). Several types of data were obtained. First, the performance characteristics, thrust, torque, and efficiency, were documented using a six component strain gage balance located in …
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Noise from a Rotor Ingesting Inhomogeneous Turbulence
… frequency, was studied for a wide range of advance ratios. At high advance ratios, evidence of vortex shedding from the blade trailing edges was observed. For low advance ratios, the haystacks narrowed, became more symmetric and increased in number. A method of determining the average …
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Measurement of aerodynamic characteristics of MAVs using motion tracking
… the Extra 300 3D over a range of propeller advance ratios (J = 0.3–1.0) with the propeller running at pre-determined speeds (RPM). A thrust model was developed for a commercially manufactured propeller, and the lift and drag characteristics of the aircraft was analyzed. The results indicate …