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 14 of 14 for “"lift curve"”.
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An evaluation of the longitudinal dynamic stability of an aircraft at stall.
… A linear analysis determined the effect of lift curve slope variation. An investigation was made to identify the non-linear lift curve variations needed to create the often observed "rocking-chair" or 'porpoising" stall trait. The characteristics of this limit-cycle oscillation were examined.
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An experimental and computational aerodynamic investigation of a low-canard high-wing aircraft design
… was also done in both sets of tests. Lift characteristics showed an apparent onset of stall and then a second rise in the lift curve. The aircraft displayed stable characteristics in both the longitudinal and lateral/directional cases. However, the pitch break at the onset of stall was …
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Measurement of aerodynamic characteristics of MAVs using motion tracking
… results was made for parameters such as the lift curve and neutral point location. The aircraft used in this research operated in a Reynolds number range of 20,000 to 30,000. Low Reynolds numbers effects that influence the aerodynamic characteristics and performance of the aircraft are …
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An experimental study of the aerodynamic characteristics of a wing in close proximity to a moving ground plane
… the wing experienced an increase in the lift-curve slope and a reduction in induced drag, which resulted in an increase in the lift-drag ratio.
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Laminar, steady and unsteady flow over inclined plates in two and three dimensions
… bubble at the leading edge. The slope of the lift curve for the 2D viscous flow is less than 2Ï , the result predicted by the thin wing theory. The solution for the three dimensional flow is strongly influenced by the the existence of the tip vortices. The slope of the lift curve for the 3D …
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Exploratory experimental investigation of a wave propeller
… could significantly affect the airflow over a lifting airfoil surface to delay the onset of stall. The lifting airfoil shape was a NACA 66(215)-216, chosen for its chordwise pressure port instrumentation. Testing consisted of measuring the pressure distribution of the NACA 66(215)-216 airfoil …
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Low-Cost Wearable Head-Up Display for Flight General Aviation
… turbulence, provided that a reasonably accurate lift curve is determined. A novel accelerometer method is proposed for estimating the relative pitch attitude estimation of the pilot’s head. The method is evaluated on the ground and in flight, and is shown to be superior to other commercially …
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An Investigative Study of Gurney Flaps on a NACA 0036 Airfoil
… Gurney flaps had the effect of eliminating the lift reversal effect and lowering the profile drag at low angles of attack, ranging from 4-27%. The optimal Gurney flap appeared to be 2% of the chord. CFD modeling of the problem had limited success, with the best results coming from Mentor’s k-w …
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Surrogate Models for Transonic Aerodynamics for Multidisciplinary Design Optimization
… ratios, free-stream Mach numbers, and lift coefficients. These points are used to generate surrogate models which can be used for the two-dimensional aerodynamic calculations required by the MDO computational design environment. Strip theory is used to relate these two-dimensional …
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Numerical Simulations of Iced Airfoils and Wings
… accurately for large upper-surface ice shapes. A lift-break (pseudo-stall) condition was then defined based on the lift curve slope change. The lift-break angles compared reasonably with experimental stall angles, and indicated that the critical ice-shape location tended to be near the location of …
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Terminal control of a variable-stability slender reentry vehicle
… deflections; the former manipulates the drag, lift-curve slope, and static margin; the latter controls the vehicle trim characteristics. The control problem is interesting because the static margin can be actively controlled from statically stable in pitch to statically unstable in pitch. …
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Preliminary Test Predictions for Scale Ram-Air Parachute Testing
… for determining the aerodynamic coefficients of lift (𝐶𝐿) and drag (𝐶𝐷) conducted in a wind tunnel. Additionally, a CFD approach where a steady-state parachute shape defined based on experiments, photographs, and literature, is presented. The accuracy of the simulation depends considerably on the …
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Micro air vehicle motion tracking and aerodynamic modeling
… (less than approximately 20 deg) showed the lift, drag, and moment coefficients during nominal gliding flight. For the lift curve, the results showed a linear curve until stall that was generally less than finite wing predictions. The drag curve was well described by a polar. The moment …
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Aerodynamics of lifting surfaces in propeller slipstreams
… can severely affect the aerodynamic forces on a lifting surface. Steady-state computational results for a symmetric SD8020 airfoil with chord length of 1 ft in a propeller slipstream at a freestream Reynolds number of 100,000 are presented in this study. ANSYS FLUENT was used to solve the flow …