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 12 of 12 for “"rotor performance"”.
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Probabilistic analysis of meanline compressor rotor performance
This thesis addresses variability in aerodynamic performance of a compressor rotor due to geometric variation. The performance of the rotor is computed using a meanline model that includes the effect of tip clearance blockage, calculated by assuming the tip leakage behaves like a wake in a pressure …
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Effects of stator pressure field on upstream rotor performance
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Noise And Propulsive Efficiency Interactions For Rotors And Propellers At Constant Thrust
… with an electric motor and a variable pitch rotor/propeller. The combination of the electric motor with the variable pitch propeller/rotor allows for a decoupled rotational speed and torque generation, meaning that the electric motor can generate the same amount of torque while operating at …
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A two-dimensional model to predict rotating stall in axial-flow compressors
… of these dynamic models on experimental performance data, significant effort has been devoted to the development of stage characteristic prediction techniques. As part of this ongoing effort, a model to simulate rotating stall inception and development in axial-flow compressor stages was …
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A parametric analysis of the start-up procedure and flight characteristics of a gliding autogyro
… precision. Over the past half-century most rotorcraft research has focused on helicopter design, only viewing autorotation as a means of achieving emergency landings. In contrast, this project utilized early rotor theory to develop algorithms which can predict unpowered rotor performance …
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High-Fidelity Modeling of eVTOL Rotor Unsteady Aerodynamic and Aeroacoustic Response to Time-Harmonic Gust
… the aerodynamic and acoustic response of rotors to unsteady inflow represents a major uncertainty in community-noise assessment and certification. This thesis investigates the aerodynamic and aeroacoustic behavior of a representative eVTOL rotor subjected to time-harmonic inflow …
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Numerical Investigation of Rotor-Gust Acoustic Interactions Using the OVERFLOW CFD Solver
… certification is the aeroacoustic response of rotors to unsteady inflow conditions. This research addresses this gap by investigating the aerodynamic and acoustic behavior of a representative rotor subjected to time-harmonic inflow disturbances. By establishing a robust numerical framework, …
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Aerodynamic performance evaluation of multi inner blades savonius rotor
… For that, this study aims to increase the performance of the Savonius wind rotor in order to generate more useful power. In the present study, the aerodynamics performance of the Savonius wind turbine rotor with inner blades was investigated. The effect of number of inner blades, angle of …
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Single- and Dual-Plane Automatic Balancing of an Elastically-Mounted Cylindrical Rotor with Considerations of Coulomb Friction and Gravity
… balancing of elastically-mounted cylindrical rotors. The application is primarily to systems with a vertically-oriented single-bearing support, but extension is also made to horizontally-oriented single-bearing support as typically found in a vehicle wheel. The rotor elastic mounting includes …
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AEROMECHANICS OF A DOUBLE ANHEDRAL TIP COMPOSITE ROTOR: EXPERIMENT AND MODELING
This thesis investigates the performance and loads on a double-anhedral tip modern composite rotor. Double anhedral tips are a recent introduction in rotors with no research data available for understanding their behavior or modeling them adequately. The objectives were to bridge these gaps. Both …
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Propeller-Driven Rotor Twirl Phenomenon: Hover Performance, Dynamics, and Controls
Propeller-driven rotors use compact electric motors and propellers, mounted on the main rotor blade, to generate the mechanical torque needed to rotate the main rotor. The presented work details experiments and model developments in three major areas: hover performance, dynamics, and controls. The …
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Rotor Wakes; Formations, Interactions, and Design
… investigates the fundamental flow physics of rotor wakes and presents a rotor design methodology that enables the creation of mission-tailored wakes for improved aero-propulsive integration. These goals are addressed through a series of experimental campaigns involving both ducted and unducted …