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.
Results
Showing 1 to 20 of 181 for “"airfoils"”.
-
Optimization of Airfoils for Maximum Lift
Made available in DSpace on 2014-12-09T18:12:24Z (GMT). No. of bitstreams: 1 6901383.pdf: 2650688 bytes, checksum: b75d3cdd42d95477c6929514ff16dedf (MD5) Previous issue date: 1968
-
Optimization of Airfoils for Maximum Lift
Submitted by Carly Hafner (chafner2@illinois.edu) on 2014-07-11T18:41:27Z No. of bitstreams: 1 1968_Liebeck.pdf: 1827459 bytes, checksum: 365f33d127dc218db2a6cd7e9d7014d8 (MD5)
-
Probabilistic aerothermal design of compressor airfoils
… variability is undesirable in turbomachinery airfoils, little is known in detail about its impact on aerothermal compressor performance. In this work, statistical and probabilistic techniques were used to assess the impact of geometric and operating condition uncertainty on axial compressor …
-
Unsteady Aerodynamics of Deformable Thin Airfoils
… to rigid airfoil motion) to deformable thin airfoils. Frequency-domain lift, pitching moment and thrust expressions are derived for an airfoil undergoing harmonic oscillations and deformation in the form of Chebychev polynomials. The results are validated against the time-domain unsteady …
-
Characterization of Oscillatory Lift in MFC Airfoils
The purpose of this research is to characterize the response of an airfoil with an oscillatory morphing, Macro-fiber composite (MFC) trailing edge. Correlation of the airfoil lift with the oscillatory input is presented. Modal analysis of the test airfoil and apparatus is used to determine the …
-
An Inverse Design Method for Supersonic Airfoils
… transformation technique to parameterize airfoils during an iterative process. The robustness of the method is demonstrated through several distinct design cases including supersonic airfoils, unique geometries, and a Sears-Haack body. </p>
-
Numerical Simulations of Iced Airfoils and Wings
… ice shapes on the aerodynamic performance of airfoils and wings. In the first part of this study, a range of Reynolds numbers and Mach numbers, as well as ice-shape sizes and ice-shape locations were examined for various airfoils with the Reynolds-Averaged Navier-Stokes approach. Comparisons …
-
An Experimental Investigation of Blown-Flap Airfoils
… and flow characteristics of propeller blown-flap airfoils. These surveys produced accurate estimates for the cₗ,cₓ,cₘ performance of these wings as a function of the test parameters of angle of attack, 𝛼, flap deflection, 𝛿 subscript f, and blowing power, Δcj. In proper operating regimes, maximum …
-
Viscous-inviscid interaction for incompressible flows over airfoils
… viscous effects in incompressible flows over airfoils. These effects are taken into account by assuming the existence of a boundary layer which interacts with an external inviscid flow. Numerical methods for solving the inviscid and boundary-layer flows are briefly described. The main …
-
Computational analysis of multielement airfoils for wind turbines
Multielement airfoil configurations have shown promise in improving the aerodynamic and structural characteristics of the inboard section of megawatt-scale wind turbine blades by increasing the lift coefficients and lift-to-drag ratios. Steady-state, two-dimensional CFD calculations were carried …
-
Efficient and robust design optimization of transonic airfoils
… procedures have been employed for the design of airfoils in transonic flow based on the transonic small-disturbance (TSD) and Euler equations. A sequential approximation optimization technique was implemented for solving the design problem of lift maximization with wave drag and area constraints. …
-
A potential flow model for separated flow around airfoils
Continuing the study carried out by Dr. W.W.H. Yeung, a former Ph.D. student in the department of Mechanical Engineering at U.B.C., some new work has been done on the wake source model, a potential flow model for steady separated flow. This work includes some modifications to the model and …
-
Numerical Loss Prediction of high Pressure Steam Turbine airfoils
… low, owing to the fact that the flow over the airfoils was well behaved. The loss coefficient also showed a slight decrease with exit Mach number for all three profiles. The mid radius and tip profiles showed near identical performance due to similarity in their geometries. It was also found …
-
Optimization of Wind Turbine Airfoils/Blades and Wind Farm Layouts
… address the shape optimization of wind turbine airfoils and blades. In recent years, the airfoil sections with blunt trailing edge (called flatback airfoils) have been proposed for the inboard regions of large wind-turbine blades because they provide several structural and aerodynamic …
-
An Experimental Study of Unsteady Flow Over Airfoils Near Stall
The remaining six airfoils did not exhibit low-frequency unsteady behavior near stall and the resulting lift fluctuations were very small (less than 0.040). These airfoils exhibited trailing-edge separation which moved forward on the airfoil as the angle of attack was increased into stall. The …
-
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 …
-
Design and analysis of supercritical airfoils with boundary layer suction
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
-
CAD-casting of gas turbine airfoils using three dimensional printing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
-
Aerodynamic and Electromechanical Design, Modeling and Implementation Of Piezocomposite Airfoils
… and fabricated for experimental validation. The airfoils are evaluated in the wind tunnel for their two-dimensional lift and drag coefficients at low Reynolds number flow. The effects of piezoelectric hysteresis are identified. In addition to the shape control application, low Reynolds number …
Page 1 of 10