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 20 of 43 for “"Trailing Edges"”.
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A study on the performance of hydrofoils with thick trailing edges
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Circulation control for download wake reduction on a scaled V-22 model
… of blowing slots across the leading edge and trailing edge, activation of one or both of the blowing devices, and adjustment of slot velocity. The results of the study show a decrease in the download force through the incorporation of the Coanda Effect around the leading and trailing edges. …
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Airfoil response to periodic disturbances: the unsteady Kutta condition
… were obtained in the vicinity of the trailing edges of both the pitching and the fixed airfoils. The flowfields in the wake and at the trailing edges of both airfoils were studied visually. The validity of the quasi-steady and an extension to an unsteady Kutta condition are examined. A …
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Trailing Edge Aerodynamics: Flow Regimes, Geometry and Loss
The flow at the trailing edge of a turbine blade at transonic air velocities can be extremely complex. Solid trailing edges can shed vortices in a manner known as transonic vortex shedding, where vortices form very close to the trailing edge and cause large trailing edge shear layer deflection. …
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Stochastic Analysis of the Transport of Adsorbing Pollutants in Aquifers Having Spatially Variable Chemical Properties
… of contaminant concentration at the leading and trailing edges of a plume. This has important implications for regulatory assessments for hazardous components which often require calculations of arrival times for low concentration values. Other analytical results show that spatial variability …
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Reduction of Unsteady Rotor-Stator Interaction Using Trailing Edge Blowing
… to assess the effects of adding mass flow at the trailing edges of four stators upstream of an aircraft engine simulator. By using trailing edge blowing to minimize the shed wakes of the stators, the flow into the rotor was made more uniform. In these experiments a reduced number of stators (four) …
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Flutter of sandwich panels at supersonic speeds
… support boundary conditions on the streamwise edges an exact solution can be obtained. The associated characteristics equation can be factored into a fourth degree equation and a second degree equation; thus an analytical expression can be obtained for the characteristic roots. The solution …
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A novel optimised design using slots for flow control and high-lift performance of UCAVs
… One configuration has a moderate leading and trailing edges sweep of Λ = 40°, while the other configuration is highly swept with a leading-edge sweep of Λ = 60° and trailing edges sweep of Λ = 40°. The objectives of the present study on UCAV configurations are two-fold: first to predict …
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Modifications of Coherent Structures in Fan Blade Wakes for Broadband Noise Reduction
The effects of trailing edge flow control on the wakes of a linear cascade of idealized fan blades was investigated experiments with a view to the likely effects on broadband aircraft engine interaction noise. Single and three-component hotwire velocity measurements were made downstream of the …
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An experimental examination of the effect of trailing edge injection on the aerodynamic performance of gas turbine blades
… an experimental investigation into the effect of trailing edge Injection on the aerodynamic performance of turbine blades conducted at Virginia Polytechnic Institute and State University (VPl&SU). A brief description of the arrangement, instrumentation and data acquisition system of the VPl&SU …
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Flow patterns and energy dissipation rates in batch rotor-stator mixers
… occurred in the regions around the leading and trailing edges due to stagnations in those regions. Stators with narrow holes generated more uniform energy dissipation rate profile around the holes than those with wide holes since the regions with high energy dissipation rate around the leading …
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A vortex panel method for potential flows with applications to dynamics and controls
… varying. The wake emanates from the sides and trailing edges of the thin lilting surfaces and is modeled as a progressively formed collection of vortex filaments. This model provides a continuous pressure distribution on the surface while allowing the wake to roll up as tightly as needed. The …
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Analysis of Kelvin-Helmholtz Instabilities Developing from Oblique Shock Interaction with a Heavy Gas Column
… on the leading (with respect to the shock) and trailing edges of the column. On the leading edge, small perturbations are amplified by shear at the interface. This leads to the development of full billows, or ``cat's eye'' vortices, physically indistinguishable from Kelvin-Helmholtz …
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A doublet panel method for generalized supersonic lifting surfaces
… swept at different angles at their leading and trailing edges, allowing for generalized lifting surfaces to be analyzed. The component of the perturbation velocity that is normal to the lifting surface at each specified control point induced by each doublet panel is calculated. Applying the flow …
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Investigation of edge effects in thermoacoustic couple measurements
… that were located along the leading and trailing edges of the TAC plates. Because of its proximity to the edge, the thermopile may have been sensitive to effects which, though perhaps causing local deviations in the temperature profile, do not affect the temperature profile in interior …
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Structural Design and Analysis of a Kinematic Mechanism for a Morphing Hyper-Elliptic Cambered Span (HECS) Wing
… nonplanar, hyper-elliptically swept leading and trailing edge as well as spanwise camber. For this wing, the leading and trailing edges are swept back according to a hyper-elliptical equation. The span of the wing is also defined with hyper-elliptical anhedral giving it nonplanar spanwise camber. …
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Numerical Simulations of Supercavitating Propellers and Hydrofoils
… for supercavitating profiles with truncated trailing edges (TE). Both the BEM and the URANS solutions are validated against experimental data for a range of operating conditions and their discrepancies from experimental trends are quantified. The predicted solutions from both methods closely …
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Design and aerodynamic analysis of an airfoil with a bioinspired leading edge device for stall mitigation at low Reynolds number operation
… such as flaps or slats, from the wing leading or trailing edges are often used to extend the aerodynamic envelope. One such aerodynamic device is the Alula, a feather structure attached to one of the hand digits of a bird's wing. The alula is extended by birds at high incidence angles and has been …
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Asymptotic approximations for the sound generated by aerofoils in unsteady subsonic flows
… the local, “inner”, regions at the leading and trailing edges of the aerofoil. Approximations for the far-field noise (in the “outer” regions) are the principal results, however one can also extract approximations for the unsteady pressure generated on the surface of the aerofoil. The surface …
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