Journal ArticleDOI
The drag coefficient of finite-aspect-ratio perforated circular cylinders
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TLDR
In this paper, the drag coefficient of porous circular cylinders (60% open area ratio) fixed between solid hemispherical end caps, for five values of aspect ratio between 7.92 and 2.67, was analyzed.About:
This article is published in Journal of Wind Engineering and Industrial Aerodynamics.The article was published on 1978-01-01. It has received 18 citations till now. The article focuses on the topics: Drag coefficient & Parasitic drag.read more
Citations
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Wind-Tunnel Modelling of the Influence of Vegetation Structure on Saltation Threshold
TL;DR: In this paper, the influence of vegetation structure on saltation threshold was investigated using uniformly spaced arrays of non-erodible roughness elements on a bed of erodible sand in an wind tunnel.
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Flow structure around perforated cylinders in shallow water
TL;DR: In this article, the effect of porosity, β on the flow structure of perforated cylinders using high-image density Particle Image Velocimetry technique in shallow water flow was analyzed.
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The effect of porosity on the drag of cylinders
TL;DR: In this article, a study of the drag of various types of porous cylinders, bars and plates under steady laminar inflow is presented, and it is shown that, for most cases, the drag decreases with increased porosity.
Journal ArticleDOI
The effect of an unsteady flow incident on an array of circular cylinders
TL;DR: In this article, the effect of an inhomogeneous and unsteady velocity field incident on an array of rigid circular cylinders arranged within a circular perimeter (diameter ) of varying solid fraction was investigated.
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Experimental study on wake flow structures of screen cylinders using PIV
TL;DR: In this article, the evolution of the vortical structures in the wakes of four types of screen cylinders at a Reynolds number of about 3200 was studied in a water flume using Particle Image Velocimetry (PIV).
References
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Journal ArticleDOI
Wake characteristics of two-dimensional perforated plates normal to an air-stream
TL;DR: In this article, the flow in the wakes behind two-dimensional perforated plates has been investigated in the Reynolds number range 2·5 × 104 to 9·0 × 104 and the results indicate the existence of two distinct types of flows: one appropriate to high and the other to low values of plate porosity.
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Wakes behind two-dimensional surface obstacles in turbulent boundary layers
TL;DR: In this paper, an analytical theory is deduced for the mean velocity behind a two-dimensional obstacle (of height h) placed on a rigid plane over which flows a turbulent boundary layer (of thickness δ).
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Overhead-line oscillations and the effect of aerodynamic dampers
TL;DR: In this paper, the energy per cycle dissipated by the aerodynamic drag is calculated, and then, assuming the lift coefficient of the cable to be less than some measured maximum value, the maximum possible amplitude of oscillation for a given windspeed is found.
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A fast response anemometer for measuring the turbulence characteristics of the natural wind
C E Hopley,M J Tunstall +1 more
TL;DR: In this paper, the design, calibration and field operation of a fast response anemometer is described for measuring the three components of the atmospheric wind speeds in winds of up to 29 m s-1 and resolving the turbulence components up to a frequency of 5 Hz.