Evaluation of a simple open circuit wind tunnel for large droplet support

1974 ◽  
Vol 79 (30) ◽  
pp. 4460-4466 ◽  
Author(s):  
C. D. Stow ◽  
M. C. Woodward
Keyword(s):  
Wind Tunnel ◽  
Open Circuit ◽  
Large Droplet

Air flow quality analysis of an open-circuit boundary layer wind tunnel and comparison with a closed-circuit wind tunnel

2020 ◽  
Vol 32 (12) ◽  
pp. 125120
Author(s):  
María Jiménez-Portaz ◽  
Luca Chiapponi ◽  
María Clavero ◽  
Miguel A. Losada
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Air Flow ◽  
Open Circuit ◽  
Closed Circuit ◽  
Quality Analysis ◽  
Flow Quality

scholarly journals Wind Directional Effect on a Single Storey House Using Educational Wind Tunnel

2018 ◽  
Vol 206 ◽  
pp. 01006
Author(s):  
S S Zaini ◽  
N Rossli ◽  
T A Majid ◽  
S N C Deraman ◽  
N A Razak
Keyword(s):  
Wind Tunnel ◽  
Wind Direction ◽  
Open Circuit ◽  
Wind Tunnel Testing ◽  
Pressure Measurements ◽  
Building Model ◽  
Gable Roof ◽  
Roughness Elements ◽  
Scale Down ◽  
High Suction

Wind tunnel testing of single-storey isolated building with 1: 100 scale down model was carried out in an open circuit wind tunnel without roughness elements facilities. The gable roof building model with 30˚ roof pitch was studied for wind directions of 0˚, 30˚, 45˚, 60˚ and 90˚. Pressure measurements were performed on all the walls and the roof (Zone 1, 2, 3, 4 and 5) of the building model with wind speed of 12 m/s. The results showed that the high suctions were generally induced by the 90˚ wind direction for Zone 1 and 60˚ and 90˚ wind directions for Zone 2. Mostly, high suction was also observed in case of 45˚ and 60˚ wind direction in Zone 3. In zone 4 and zone 5, high suction was generally induced by the 0˚ wind direction.

DEVELOPMENT OF AN OPEN-CIRCUIT LOW-SPEED WIND TUNNEL

2015 ◽  
Author(s):  
Ronaldo Menezes dos Santos Junior ◽  
André Luiz Amarante Mesquita ◽  
Miriam Lys Gemaque
Keyword(s):  
Wind Tunnel ◽  
Open Circuit ◽  
Low Speed ◽  
Low Speed Wind Tunnel

WIND PRESSURE DISTRIBUTION ON LOW-RISE BUILDINGS WITH CYLINDRICAL ROOFS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Astha Verma ◽  
Ashok Kumar Ahuja
Keyword(s):  
Boundary Layer ◽  
Experimental Study ◽  
Wind Tunnel ◽  
Pressure Distribution ◽  
Open Circuit ◽  
Wind Pressure ◽  
Wind Loads ◽  
Wind Loading ◽  
Pressure Coefficients ◽  
Available Information

Wind is one of the important loads to be considered while designing the roofs of low-rise buildings. The structural designers refer to relevant code of practices of various countries dealing with wind loads while designing building roofs. However, available information regarding wind pressure coefficients on cylindrical roofs is limited to single span only. Information about wind pressure coefficients on multi-span cylindrical roofs is not available in standards on wind loads. Present paper describes the details of the experimental study carried out on the models of low-rise buildings with multi-span cylindrical roofs in an open circuit boundary layer wind tunnel. Wind pressure values are measured at many pressure points made on roof surface of the rigid models under varying wind incidence angles. Two cases namely, single-span and two-span are considered. The experimental results are presented in the form of contours of mean wind pressure coefficients. Results presented in the paper are of great use for the structural designers while designing buildings with cylindrical roofs. These values can also be used by the experts responsible for revising wind loading codes from time to time.

Development of the Reattached Flow Behind Surface-Mounted Two-Dimensional Prisms

1988 ◽  
Vol 110 (2) ◽  
pp. 127-133 ◽  
Author(s):  
J. Antoniou ◽  
G. Bergeles
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Open Circuit ◽  
Two Dimensional ◽  
Blow Down ◽  
Length Scales ◽  
Turbulent Eddies ◽  
Flow Parameters ◽  
Varying Length ◽  
Dimensional Surface

Velocity and turbulence measurements are presented for the region after reattachment behind a two dimensional surface-mounted prism of varying length. The prism is mounted on the floor of an open circuit blow down wind tunnel and flow parameters for the developing boundary layer are deduced from the measurements; longitudinal integral time and length scales are estimated through autocorrelations. Reattchment on top of the prism, due to its increased length, affects the characteristics of the developing boundary layer; in this case the shear layer originating from the up-stream edge of the prism splits twice at reattachment points on top and behind the prism and the integral length scales of the turbulent eddies are found to be smaller due to the splitting.

A Miniaturized Piezoelectric Wind Flutter Generator

2012 ◽  
Vol 503 ◽  
pp. 71-74
Author(s):  
Xing Qiang Zhao ◽  
Zhi Yu Wen ◽  
Zhi Gang Du
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Power Density ◽  
Output Power ◽  
Empirical Formula ◽  
Critical Speed ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Flexible Beam ◽  
Working Principle

A novel miniaturized piezoelectric wind flutter generator is proposed which consisted of a flexible beam and a PZT cantilever. The working principle is based on flexible beam flutter, which can amplify the PZT cantilever vibration. A prototype was tested in a wind tunnel. It is found that there are three behavior states with wind speed increasing, and flutter behavior takes place when wind speed varies between the critical wind speed Uc1and Uc2, an empirical formula was obtained about the critical speed Uc1. The open circuit voltage and power were measured. The device can generate 794μW output power with 30kΩ resistor in a wind of speed 20m/s, power density is 139μW/cm3.

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