Abstract Vortex generator (VG) is a passive flow control technology, which can effectively inhibit separation. Recently, significant research efforts have been devoted to the study on application of VG in airfoil, wing/blade and aircraft separation inhibition. However, variable height distribution along wingspan still lacks. This focuses experimental investigation influence ramp aerodynamic cha...

Wind turbines are important devices that extract clean energy from wind flow. The efficiency of wind turbines should be examined under various working conditions in order to estimate off-design performance. Numerous aerodynamic and structural research works have been carried out to compute aeroelastic effects on wind turbines. Most of them suffer from either the simplicity of the modelling ...

This paper focuses on a novel morphing aircraft capability called perching: the ability of an aircraft to make a planted landing using primarily aerodynamic forces in lieu of high thrust. Specifically, the modeling of the perching aircraft’s aerodynamics and the problem of computing and optimizing a perching trajectory using this model are presented. The aerodynamic model discussed herein is de...

The objective of this paper is to assess 10 MW directdrive permanent-magnet (DDPM) generator systems with different control strategies namely pitch control and active speed stall control. In the active speed stall control concept, there is no pitch mechanism, and the rotor speed is actively controlled by the generator to control the output power. The active speed stall control wind turbine with...

Plus BROWSE SEARCH IEEE XPLORE GUIDE SUPPORT View TOC Rotating stall control for axial flow compressors Belta, C. Guoxiang Gu Sparks, A. Banda, S. Dept. of Electr. & Comput. Eng., Louisiana State Univ., Baton Rouge, LA; This paper appears in: Decision and Control, 1998. Proceedings of the 37th IEEE Conference on Publication Date: 1998 Volume: 3, On page(s): 2557-2562 vol.3 Meeting Date: 12/16/1...

The ability of vortices to induce aerodynamic loads on proximal surfaces plays a significant role in wide variety flows. However, most studies vortex-induced effects primarily focus analyzing the influence rotation-dominated cores vortices. In this work, we show that not only are viscous flows surrounded by strain-dominated regions, but these regions dynamically important and can sometimes even...

Wind turbines are important devices that extract clean energy from wind flow. The efficiency of wind turbines should be examined under various working conditions in order to estimate off-design performance. Numerous aerodynamic and structural research works have been carried out to compute aeroelastic effects on wind turbines. Most of them suffer from either the simplicity of the modelling appr...

The presence of a stable leading edge vortex (LEV) on steadily revolving wings increases the maximum lift coefficient that can be generated from the wing and its role is important to understanding natural flyers and flapping wing vehicles. In this paper, the role of LEV in lift augmentation is discussed under two hypotheses referred to as 'additional lift' and 'absence of stall'. The 'additiona...

Vertical axis wind turbines (VAWT) are an alternative to horizontal axis wind turbines (HAWT) for wind and tidal energy harvesting applications. Studies of vertical axis wind turbines have heavily invested in understanding the behaviour of the complete turbine, but often with only cursory assessment of the contributions of unsteady aerodynamics of individual blades. This paper experimentally ex...

The development of micro aerial vehicles has been hindered by a poor understanding of the flight dynamics associated with the unique aerodynamic regime. This study experimentally estimates the aerodynamic damping derivatives of flat-plate wings with aspect ratios less than 3 at a Reynolds number of 7.5 × 104; when combined with previously published results detailing the lateral and longitudinal...