نتایج جستجو برای: wind flow

تعداد نتایج: 557311  

2011
Hui Hu Zifeng Yang Partha Sarkar Fred Haan

An experimental study was conducted to quantify the characteristics of a tornado-like vortex and to reveal the dynamics of the flow-structure interactions between a low-rise, gable-roof building model and swirling, turbulent tornado-like winds. The experimental work was conducted by using a large-scale tornado simulator located in the Aerospace Engineering Department of Iowa State University. I...

Journal: :The Journal of experimental biology 2013
Sridhar Ravi James D Crall Alex Fisher Stacey A Combes

Our understanding of how variable wind in natural environments affects flying insects is limited because most studies of insect flight are conducted in either smooth flow or still air conditions. Here, we investigate the effects of structured, unsteady flow (the von Karman vortex street behind a cylinder) on the flight performance of bumblebees (Bombus impatiens). Bumblebees are 'all-weather' f...

2016
B. R. Karthikeya Prabal S. Negi N. Srikanth

In highly urbanized and energy intensive countries like Singapore all possible avenues for power generation need attention. In this context, rooftop installations of both solar and wind energy are of particular interest for Singapore, especially because of Singapore's condition of land limitation. Decentralized and distributed energy sources such as rooftop wind and solar installations have num...

2013
C. P. Butterfield

Aerodynamic, load, flow-visualization, and inflow measurements have been made on a 10-m, three-bladed, downwind, horizontal-axis wind turbine ( HAWT). A video camera mounted on the rotor was used to record night­ time and daytime video images of tufts attached to the low-pressure side of a constant-chord, zero-twist blade. Load measurements were made using strain gages mounted at every 10% of t...

2010
Zhi-Gang Yang Wei Yang Qing Jia

Viscous effect of wing in ground effect in wind tunnel test was investigated numerically. Ground settings in wind tunnel test were simulated by specifying different ground boundary conditions in CFD. It was revealed for fixed-ground based wind tunnel test that: boundary layer developed from the ground deforms effective ground surface and introduces a decreased effective ground clearance; a shar...

Using the renewable energy is the better option to supply demined in the standalone area. World’s most fast-growing renewable energy resource is the wind energy. One of the main disadvantages of this system, however, is that naturally variable wind speed causes power fluctuation problems at the load side. Besides, long-term storage of power generated by wind turbines is considered as a limitati...

Journal: :فیزیک زمین و فضا 0
علی محمدی مربی، گروه هواشناسی دانشگاه علوم دریایی امام خمینی(ره) نوشهر، ایران علیرضا محب الحجه دانشیار، گروه فیزیک فضا، مؤسسه ژئوفیزیک دانشگاه تهران، ایران

the baroclinic adjustment is defined as the neutralization of the mean flow by eddies. with the amplitude growth of the baroclinic waves generated by an unstable mean flow, the eddy fluxes increase and act to reduce the meridional temperature gradient or vertical wind shear of the mean flow to subcritical value. this is believed to constitute the basic mechanism of baroclinic adjustment. the co...

2014
A-J. Buchner A. J. Smits J. Soria

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...

2010
Zifeng Yang Partha Sarkar Fred Haan

An experimental study was conducted to quantify the characteristics of wake vortex and flow structures around a gable-Roof building model as well as the resultant pressure distribution and wind loads (both forces and moments) acting on the test model in tornadolike winds. In addition to measuring the pressure acting on the tested high-rise building model using pressure transducers and wind load...

Journal: :energy equipment and systems 0
mahdi nili-ahmadabadi department of mechanical engineering, isfahan university of technology, isfahan 84156-83111, iran farzad mokhtarinia department of mechanical engineering, isfahan university of technology, isfahan 84156-83111, iran mehdi shirani subsea r&d center, isfahan university of technology, isfahan 84156-83111, iran

the purpose of this study is to improve the aerodynamic performance of wind turbine blades, using the ball-spine inverse design method. the inverse design goal is to calculate a geometry corresponds to a given pressure distribution on its boundaries. by calculating the difference between the current and target pressure distributions, geometric boundaries are modified so that the pressure differ...

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