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 25 for “"airfoil design"”.
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Supersonic 'oblique all wing' airfoil design
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Novel Inverse Airfoil Design Utilizing Parametric Equations
The engineering problem of airfoil design has been of great theoretical interest for almost a century and has led to hundreds of papers written and dozens of methods developed over the years. This interest stems from the practical implications of airfoil design. Airfoil selection significantly …
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Airfoil design framework for optimized boundary-layer integral parameters
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Hybrid Airfoil Design Methods for Full-Scale Ice Accretion Simulation
"The objective of this thesis is to develop a design method together with a design philosophy that allows the design of ""subscale"" or ""hybrid"" airfoils that simulate fullscale ice accretions. These subscale or hybrid airfoils have full-scale leading edges and redesigned aft-sections. A …
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Trailing Edge Flow Conditions as a Factor in Airfoil Design
Some new developments relevant to the design of single-element airfoils using potential flow methods are presented. In particular, the role played by the non-dimensional trailing edge velocity in design is considered and the relationship between the specified value and the resulting airfoil …
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Aerodynamic Performance Enhancement of a NACA 66–206 Airfoil Using Supersonic Channel Airfoil Design
Supersonic channel airfoil design techniques have been shown to significantly reduce drag in high-speed flows over diamond shaped airfoils by Ruffin and colleagues. The effect of applying these techniques to a NACA 66-206 airfoil is presented. The design domain entails channel heights of 8-16.6% …
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Wake bursting: a computational and experimental investigation for application to high-lift multielement airfoil design
… to study wake bursting over a multielement airfoil are lacking a detailed study of the burst wakes in a wide range of spatial coordinates. In addition, no thorough comparison between the experimentally-captured data and computational simulations of a high-lift multielement airfoil has been …
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Use of hybrid airfoil design in icing wind tunnel tests of large scale swept wings
… tunnel testing difficult. Hybrid or truncated airfoil models use full-scale leading edges with redesigned aft sections to provide test articles with much reduced model chord and therefore tunnel blockage allowing effectively full-scale icing testing on very large wings. This thesis presents …
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An a posteriori error control framework for adaptive precision optimization using discontinuous Galerkin finite element method
Introduction: Aerodynamic design optimization has seen significant development over the past decade. Adjoint-based shape design for elliptic systems was first proposed by Pironneau and applied to transonic flow by Jameson . A review of the aerodynamic shape optimization literature and a large list …
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An Inverse Design Method for Supersonic Airfoils
<p>Airfoil design is one of the most important aspects of aircraft design. Slight changes in airfoil geometry can lead to significant changes in a wide variety of aircraft performance metrics. Inverse design methods offer an efficient alternative to standard direct methods. The key to this design …
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Multidisciplinary optimization of aircraft design and takeoff operations for low noise
Aircraft planform design, takeoff operations, and airfoil design are examined as a complete system in order to quantify tradeoffs that can result in a quiet aircraft. An aircraft design model was developed to generate blended-wing-body-type designs using simple-physics models and empirical scaling …
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Experimental wind tunnel study of airfoils with large flap deflections at low Reynolds numbers
… were taken at low Reynolds numbers for four airfoils with trailing edge plain flaps in an attempt to understand the effects of Reynolds number, percent thickness (t/c), percent chord of flap (flap-chord ratio), and flap deflection on airfoil performance. The four airfoils used in this …
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Design optimization using CAD parameterization through CAPRI
Design optimization is one of the many areas of Computational Engineering that is directly applicable to almost any engineering endeavor. The design cycle is a multi-step process, beginning with a Computer Aided Design (CAD) model and ending with an optimized version of that model relative to some …
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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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Performance Improvement through Velocity Triangle Optimization-Driven Redesign for Mitigating the Horseshoe Vortex in Axial Turbines
… roll-up, but traditional structural modification design systems can be prohibitively complex and time-intensive.</p> <p>To address this problem, this study contributes a blade modification method involving airfoil shape optimization, designed to adjust the leading edge airfoil shape in horseshoe …
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Reduction of Secondary Flow Losses in a Turbine for Use in Man-Portable Power Generation
… how the secondary flow losses from the generated airfoil shapes can be reduced to improve component performance. One of the secondary flow loss items to be addressed is the generation of the Horseshoe Vortex. The Horseshoe Vortex is an aerodynamic phenomenon that occurs in axial turbine cascades …
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Designed Reduction of Radiated Noise Characteristics from Two-Bladed General Aviation Propellers
… two bladed general aviation propellers, through design. The Aircraft Noise Prediction Program - Propeller Analysis System (ANOPP-PAS) is used to predict the noise and performance characteristics for an industry typical reference propeller as well as for the final quiet and efficient design.</p> …
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Aerodynamic design optimization using flow feature parameterization
Design optimization methods using high-fidelity computational fluid dynamics simulations are becoming increasingly popular in the area of aerodynamic design, sustaining the desire to make these methods more computationally efficient. Such design strategies typically define the aerodynamic product …
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Gradient-Based Optimum Aerodynamic Design Using Adjoint Methods
… are applied to a pressure-matching inverse design problem of quasi 1-D nozzle flows. Pontryagin’s Minimum Principle is used to derive the adjoint system and the reduced gradient of the cost functional. The properties of adjoint variables at the sonic throat and the shock location are …
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A Volume-Force Synthetic Disturbance Approach for High-Fidelity of Unsteady Fluid Structure Interactions
… source model are considered including: gust-airfoil unsteady interactions, turbulence-airfoil unsteady interactions, Analysis of the turbulence effect on acoustic radiation of a novel airfoil design with an embedded cross-ow fan, the effect of turbulence intensity on wake vortex …
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