Results 111 to 120 of about 10,050 (162)
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Shearing wind helicity and thermal wind helicity
Advances in Atmospheric Sciences, 2006Helicity is defined as H = V · ω, where V and ω velocity and vorticity vectors, respectively. Many works have pointed out that the larger the helicity is, the longer the life cycle of the weather system is. However, the direct relationship of the helicity to the evolution of the weather system is not quite clear.
Ying Han, Rongsheng Wu, Juan Fang
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Wind Shear Modeling for Wind Turbine Siting Studies
ASME 2009 Dynamic Systems and Control Conference, Volume 1, 2009A wind turbine generator offers a green renewable alternative to the traditional fossil and nuclear fuel processes to generate electrical power. Both wind energy technology and wind turbine farm designs remain in demand given the current growth in energy requirements and the public’s preference for clean sources.
Trevor B. Turner +3 more
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Smoke transport by sheared winds
Combustion Theory and Modelling, 1999The effect that the wind's vertical variation has on fire plume behaviour is investigated. A parabolized set of governing equations are discretized using finite differences to arrive at the numerical model. Lagrangian particles are used to visualize the flow, account for atmospheric fluctuations and determine the smoke concentration field. A parametric
Javier Trelles +2 more
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1961
Abstract : Chapter 1 describes the background of the wind shear measuring technique. Chapter 2 describes the mechanical construction of the wind shear probe and gives some of the design criteria for the various sensors. Also described is the instrumentation package which contains the telemetering link and the electronic circuits necessary to measure ...
ROLAND L. PLANTE +2 more
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Abstract : Chapter 1 describes the background of the wind shear measuring technique. Chapter 2 describes the mechanical construction of the wind shear probe and gives some of the design criteria for the various sensors. Also described is the instrumentation package which contains the telemetering link and the electronic circuits necessary to measure ...
ROLAND L. PLANTE +2 more
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Summer Meeting, 1963
An analytical study of dynamic loads induced by wind shear is reported In the first portion of the study, the effect of simplifications in the equations of motion on solution accuracy is investigated Pitch-plane wind-shear bending moments on a hypothetical boost-glide vehicle are determined using three methods In the first method the equations used are
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An analytical study of dynamic loads induced by wind shear is reported In the first portion of the study, the effect of simplifications in the equations of motion on solution accuracy is investigated Pitch-plane wind-shear bending moments on a hypothetical boost-glide vehicle are determined using three methods In the first method the equations used are
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Wind shear and hyperbolic distributions
Boundary-Layer Meteorology, 1989A data set on wind shear, consisting of 24 frequency distributions of changes in headwind speed experienced by aircraft during landing phase, is modelled parsimoniously by means of the hyperbolic distribution.
Barndorff-Nielsen, Ole Eiler +2 more
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Analysis of extreme wind shear
27th Aerospace Sciences Meeting, 1989New methods utilizing extreme value statistical theory are applied in the analysis of the largest wind component shear in a wind profile as a function of shear layer thickness and season. Seasonal variability of extreme shear decreases as the shear layer thickness decreases.
Stanley I. Adelfang, Orvel E. Smith
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Offshore Wind Shear Estimations for Wind Power Assessment
ASME 2008 2nd International Conference on Energy Sustainability, Volume 2, 2008Appropriate wind shear estimates are extremely important when assessing any regions’ wind power resource. Wind shear is used not only to estimate wind velocity at wind turbine hub heights other than the data collection height, but also as a siting tool to compare the wind resources in different locations when wind data are not available at a consistent
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Perspectives on Wind Shear Flight
1991Wind shears originating from downbursts have been the cause of many aircraft accidents in the past two decades. In turn, this has led to considerable research on wind shear avoidance systems and wind shear recovery systems. This paper reviews recent advances in wind shear recovery systems.
A. Miele, T. Wang, G. D. Wu
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Impact of vertical wind shear on wind turbine performance
2017 International Conference on Circuit ,Power and Computing Technologies (ICCPCT), 2017This is paper presents significance of vertical wind shear. Voltage flicker that may be initiated in the output of the horizontal axis upwind wind turbine located at any given site for a given tower height and blade length. Vertical wind shear is one of the important parameters which instigate voltage flicker in wind turbine output voltage.
Datta S. Chavan +7 more
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