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 13 of 13 for “"Induced Velocities"”.
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Improved algorithms for the computation of induced velocities in propeller design
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Effect of tip-speed ratio on induced velocities near a lifting rotor
A theoretical investigation of the asymmetry of induced flow in the vicinity of a lifting rotor in forward flight has been conducted. The analysis is based upon an asymmetric wake which is a logical extension of that used for previous investigations. Equations for the induced velocities at an …
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Error and uncertainty in estimates of Reynolds stress using ADCP in an energetic ocean state
… of each process, namely that the wave induced velocities are correlated over much larger distances than the turbulence induced velocities. This method was explored for current meters by Shaw and Trowbridge. Upon adapting the method for the ADCP, it is found that the resulting Reynolds …
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Error and uncertainty in estimates of Reynolds stress using ADCP in an energetic ocean state
… to this error. It is found that the wave-induced velocities, even when filtered, introduce error variances which are of similar magnitude to that of the Reynolds stresses.
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Surfactant effects on the interaction of a three dimensional vortex pair with a free surface; and,
… the surface surfactant distribution created by induced velocities at the free surface due to the primary vortex tubes. The secondary structure in the bulk interacts with the he lical vorticity, which totally alters the vortex pattern and connection process. The presence of contamination …
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Unsteady propeller hydrodynamics by Dirk H. Renick.
… singularity sheets and compute their influence velocities was evolved which reduces computation time, and dramatically increases the accuracy of the unsteady blade loading problem. To improve the general coupling technique between potential-based propeller codes and volumetric Reynolds-Averaged …
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Propeller performance analysis using lifting line theory
… modeling of circulation distributions and induced velocities for a wide range of operating conditions. These values are then used to calculate the forces and efficiency of the propeller. The program shows good agreement with experimental data.
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An Improved Prescribed Wake Analysis for Wind Turbine Rotors
… are contained in the data set and show strong induced velocities in the axial, radial and tangential directions.
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Helicopter Flight Dynamics Simulation with a Time-Accurate Free-Vortex Wake Model
… load distributions obtained with the free wake induced velocities. The model was also validated in a lateral maneuver from hover. The results show improvements in the on-axis prediction, and indicate a possible relation between the off-axis prediction and the lack of rotor-body interaction …
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Contributions Toward Understanding the Effects of Rotor and Airframe Configurations On Brownout Dust Clouds
… Metrics based on particle counts and particle velocities in the field of view were developed to help quantify the severity of the computed brownout dust clouds. The presence of both a tail rotor and the fuselage was shown to cause both local and global changes to the aerodynamic environment …
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The prediction of unsteady three-dimensional aerodynamics on wind turbine blades
… theory that accounts for the aerofoil wake induced velocities. The unsteady model captures, in a satisfactory manner, the global response of the blade through the tower shadow region, with a negligible computational cost.
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The effect of turboprop propulsion on the aerodynamic benefits of formation flight
… VFM B-H model produced peak upwash and downwash velocities which matched those obtained by Ehret and Oertel to within 95% accuracy. Furthermore, a distance of 47.48 m between the rolled up vortex centres was achieved utilising the programmed VFM B-H model, which differed from the Ehret and Oertel …
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Rotor Wakes; Formations, Interactions, and Design
… a vortex filament in its place. The minimum induced loss (MIL) rotor has long served as the conventional baseline in rotor design. However, with the rise of DEP configurations, blown-wing systems, urban air mobility, and the widespread use of drones in populated environments, rotor design …