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 8 of 8 for “"Lift enhancement"”.
-
Covert-inspired flow control devices for lift enhancement and stall mitigation
… device for mitigating flow separation, enhancing lift, and delaying stall. In order to improve the mission adaptability of small-scale UAVs, this dissertation focuses on the design and evaluation of the covert-inspired flow control device consisting of single and multiple rows of flaps for lift …
-
Investigation Of Pressure Fluctuations In The Hyporheic Zone In Response To Flow Around A Hydraulic Structure
… is a well studied field. Particles erode when lift and drag forces overcome a critical threshold. These forces are typically studied from above the water-riverbed interface. This study maps hyporheic pressure fluctuations as they are related to surface water velocity. The pressure map is used …
-
An experimental study of a leading-edge alula-inspired device (LEAD) for moderate aspect ratio wings at low Reynolds numbers
… to 20% of the span, bird wings can sustain the lift necessary to fly at low velocities and high angles of attack. The proposed alula-inspired leading-edge device (LEAD) increases the capability of a wing to maintain higher pressure gradients by modifying the near-wall flow close to the …
-
Separated Flows Over Non-slender Delta Wings
… tilting is revealed to play an important role in lift generation at angles of attack near maximum lift. Coherent structures absent from the literature are measured and described. Second, time-resolved planar particle image velocity, forces/moments and pressure are used to measure the dynamic-stall …
-
Design of Synthetic Jet Actuator for Flight Control of Small UAV
… for Active Flow Control. Apart from lift enhancement, drag reduction, or separation control, etc; LCO suppression might be possible by modifying the boundary layer through the use of these actuators. For initial investigation, a wing section with span of 12.4 cm and chord of 14 cm was …
-
Active Flow Control of a Three-Element Airfoil in Unbounded Flow and in Ground Effect
<p>Multi-element high lift devices are used in aircraft wings to have higher lift at low speed during take-off and landing. 30P30N is a three-element airfoil developed by NASA/McDonnell Douglas for which high quality flow field data is available. As a result, it has been a subject of many …
-
Unsteady Aerodynamic/Hydrodynamic Analysis of Bio-inspired Flapping Elements at Low Reynolds Number
… which makes it challenging to generate lift and thrust. Overcoming these challenges means utilizing non-conventional lifting and flow control mechanisms generated by unsteady flapping body motion. Understanding and characterizing the aerodynamic phenomena associated with the unsteady …
-
Unsteady Nonlinear Aerodynamic Modeling and Applications
… aerodynamics. Furthermore, one may exploit the lift enhancement that can be generated through an unsteady motion for optimum design of flapping vehicles. Additionally, undesirable phenomena like the flutter of fixed wings and ensuing limit cycle oscillations can be exploited for harvesting …