Topic
Wind tunnel
About: Wind tunnel is a research topic. Over the lifetime, 29332 publications have been published within this topic receiving 345143 citations. The topic is also known as: WT.
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01 Jan 1966
TL;DR: The use of wind tunnel data for aerodynamic experiments has been studied in this article, where three dimensions of three-dimensional flow and pressure, flow, and shear stress measurements are used to calibrate the test section.
Abstract: Wind Tunnels Wind Tunnel Design Pressure, Flow, and Shear Stress Measurements Flow Visualization Calibration of the Test Section Forces and Moments from Balance Measurements Use of Wind Tunnel Data: Scale Effects Boundary Corrections I: Basics and Two- Dimensional Cases Boundary Corrections II: Three-Dimensional Flow Boundary Corrections III: Additional Applications Additional Considerations for Aerodynamic Experiments Aircraft and Aircraft Components Ground Vehicles Marine Vehicles Wind Engineering Small Wind Tunnels Dynamic Tests Appendices Index
1,828 citations
[...]
TL;DR: For R > 3.5 × 10^6, definite vortex shedding occurs, with Strouhal number 0.27 as discussed by the authors, while for R > 0.7, the vortex shedding rate becomes constant.
Abstract: Measurements on a large circular cylinder in a pressurized wind tunnel at Reynolds numbers from 10^6 to 10^7 reveal a high Reynolds number transition in which the drag coefficient increases from its low supercritical value to a value 0.7 at R = 3.5 × 10^6 and then becomes constant. Also, for R > 3.5 × 10^6, definite vortex shedding occurs, with Strouhal number 0.27.
1,133 citations
[...]
31 Oct 1964
TL;DR: In this article, measurements have been made of the time average and unsteady pressures acting on the roof and behind a series of rectangular cavities set in the roof of the 2 ft x 1 tr ft transonic tunnel.
Abstract: Measurements have been made of the time average and unsteady pressures acting on the roof and behind a series of rectangular cavities set in the roof of the 2 ft x 1tr ft transonic tunnel.
It was found that the unsteady pressures contain both random and periodic components. The random component predominates in the shallower cavities (length/depth ratio> 4) and is most intense near the rear wall. The periodioc component predominates in the deeper cavities (length/depth ratio < 4) and may form standing wave patterns. It is suggested that the periodic component is due to an acoustic resonance within the cavity excited by a phenomenon similar to th at causing edge-tones. It may be suppressed by fixing a small spoiler at the front of the cavity.
1,091 citations
[...]
TL;DR: In this paper, a surface-layer field experiment with turbulence measurements at three levels (3, 6, and 14 m) and simultaneous profile data has been analyzed to yield information on flux-gradient relationships for wind and temperature.
Abstract: Previous results of non-dimensional wind and temperature profiles as functions of ζ(= z/L) show systematic deviations between different experiments. These discrepancies are generally believed not to reflect real differences but rather instrumental shortcomings. In particular, it is clear that flow distortion has not been adequately treated in most previous experiments. In the present paper, results are presented from a surface-layer field experiment where great care was taken to remove any effects from this kind of error and also to minimize other measuring errors. Data from about 90 30-min runs with turbulence measurements at three levels (3, 6, and 14 m) and simultaneous profile data have been analysed to yield information on flux-gradient relationships for wind and temperature.
890 citations
[...]
01 Jan 1964
TL;DR: In this paper, measurements have been made of the time average and unsteady pressures acting on the roof and behind a series of rectangular cavities set in the roof of the 2 ft x 1 tr ft transonic tunnel.
Abstract: Measurements have been made of the time average and unsteady pressures acting on the roof and behind a series of rectangular cavities set in the roof of the 2 ft x 1tr ft transonic tunnel.
It was found that the unsteady pressures contain both random and periodic components. The random component predominates in the shallower cavities (length/depth ratio> 4) and is most intense near the rear wall. The periodioc component predominates in the deeper cavities (length/depth ratio < 4) and may form standing wave patterns. It is suggested that the periodic component is due to an acoustic resonance within the cavity excited by a phenomenon similar to th at causing edge-tones. It may be suppressed by fixing a small spoiler at the front of the cavity.
882 citations