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 54 for “"high lift"”.
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Performance mechanisms and integration of high-lift distributed propulsion systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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High lift configuration of a slotted natural laminar flow airfoil
… was developed to satisfy design constraints of high maximum lift and low profile drag. A two-element natural laminar flow configuration allows the typical rapid trailing-edge pressure recovery associated with NLF airfoils to be greatly reduced on the fore element, allowing for laminar flow …
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Computation of high-lift aerodynamics using unstructured grids and Reynolds-stress turbulence models
The computation of high-lift flows poses considerable challenges to the aerodynamicist.The work presented in this thesis describes the development ofan efficient unstructured grid generation method for high lift flows and theapplication of Differential Reynolds Stress Models (DRSM).The method …
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Investigating the impact of coupled high-lift devices on natural laminar flow airfoils
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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An investigation of the qualitative high-lift characteristics of three representative Davis airfoils
Thesis: B.S., Massachusetts Institute of Technology, Department of Aeronautical Engineering, 1943
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Optimal Dirichlet boundary control problems of high-lift configurations with control and integral state constraints
Diese Arbeit behandelt Optimalsteuerungsprobleme mit Navier-Stokes Gleichungen. In dieser Arbeit haben wir zwei Optimalsteuerungsprobleme untersucht, die die Umströmung von Tragflügeln in Hochauftriebskonfigurationen betrachten. Im stationären Fall, möchten wir den Auftrieb maximieren während der …
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A novel optimised design using slots for flow control and high-lift performance of UCAVs
… 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 aerodynamic performance particularly the maximum-lift characteristics of …
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Wake bursting: a computational and experimental investigation for application to high-lift multielement airfoil design
"High-lift aerodynamic flowfields are complex, and the potentially-adverse wake development associated with these high-lift systems is not fully understood. Thus, an exhaustive investigation including both experimental and computational efforts is needed to gain an increased understanding of the …
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A Comparative Study of the Low Speed Performance of Two Fixed Planforms versus a Variable Geometry Planform for a Supersonic Business Jet
<p>A numerical investigation of the effects of high lift devices on the low-speed performance of a generic swept wing and a delta wing was conducted. The two fixed planforms were initially sized to achieve the same high speed performance as the baseline variable geometry wing. Following a review of …
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Unsteady Low Reynolds Number Aerodynamics of a Rotating Wing
… by poor aerodynamic characteristics such as low lift-to-drag ratios. To overcome this, birds and insects utilize unsteady high lift mechanisms to generate sufficient lift. A leading edge vortex (LEV), one of these unsteady lift mechanism, is thought to be responsible for the high lift generated …
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Feasibility Study of a Multi-Purpose Aircraft Concept with a Leading-Edge Cross-Flow Fan
… be employed as a propulsion device as well as a high-lift system. This thesis research focuses on investigating the use of CFF as a high-lift device for an Extremely Short Take-off and Landing (ESTOL) aircraft. The wing-embedded CFF performance analysis is mostly addressed from an aerodynamic …
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Acceleration Techniques for Industrial Large Eddy Simulation with High-Order Methods on CPU-GPU Clusters
… with more complex problems such as flow over high lift configurations and through aircraft engines. The present work has the overall objective of reducing the computational cost of industrial LES. The high-order flux reconstruction (FR) method is used as the spatial discretization scheme. …
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Development of a design methodology for transport aircraft variable camber flaps suitable for cruise and low-speed operations
… several revisions were performed on conventional high-lift device design methodologies for existing transport aircraft. The definition and detail explanations are given at every phase of the methodology. A case study was performed in order to give an example of the implementation of the …
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Experimental investigation of multielement airfoils for large-scale wind turbines
Experimental results for high-lift multielement airfoils for application to megawatt-scale wind turbines are presented in this thesis. Two different airfoil configurations tested were designed for the inboard section of a 10 MW-scale wind turbine. The airfoil systems were designed as an airfoil …
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Parallel Two-Dimensional Unstructured Anisotropic Delaunay Mesh Generation for Aerospace Applications
… Delaunay refinement. Applications focusing on high-lift design or dynamic stall, or numerical methods and modeling test cases focus on two-dimensional domains. This push-button parallel mesh generation approach can generate high-fidelity unstructured meshes with anisotropic boundary layers for …
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Computational Fluid Dynamics Analysis of Inverted, Multi-Element Airfoils in Ground Effect
… of straight sections for passing other cars. Highly competitive cars in the competition implement aerodynamic devices to generate negative lift for the race car. This negative lift, or downforce, increases the amount of traction between the race car’s tires and the ground ultimately allowing …
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Wing Optimization Technique Based on Vortex Lattice Theory
… This function will seek to optimize the high lift-to-drag ratio of the wing at cruise velocity, while maximizing theoretical cruise range and minimizing wing weight. The optimization method has been developed using MATLAB and the focus of the study will be used by Cirrus Design …
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Boundary Layer Separation Control on a Salient Back-facing Ramp
… research aims to provide a structurally simpler high-lift-system solution based on the serration devices for general aviation aircraft and UAVs.
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Numerical investigation of slat noise attenuation using acoustic liners
Noise generated by high-lift devices such as slats on a wing is a major contributor to the overall airframe noise during the landing approach of a commercial aircraft. In this work the concept of attenuating slat noise using absorptive acoustic liners in the slat/main element gap is explored using …
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Lift on a rotating cylinder
… of this project was primarily to find whether lift on a rotating cylinder in an air stream increases with increase in roughness of cylinder. All previous experiments on the subject (within the knowledge of the writer and subject to the limitation of the references entered at the end of this …
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