Pitot tube velocity measurement technology for the compressible airflow and its application in wind tunnel

Abstract Wind speed has large influence on the results of road tests applied to bicycles. For this reason, this paper presents the design process of an onboard anemometer dedicated to bicycle testing. The design provides an affordable way to quantify both magnitude and direction of the wind velocity relative to the bicycle, allowing recording on arbitrary wind conditions that could arise during a test. The design methodology was structured with two major phases. The first was centered on the proof-of-concept for the use of a multi-hole pitot tube as main component for the onboard anemometer. The second was focused on the design of the structure, considering both packaging and structural integrity. The prototype of anemometer was tested in a wind tunnel to verify its performance, and it was also tested under severe vibrations to verify its structural integrity. The results showed that this concept can be used as a part of the bicycle instrumentation for road tests.

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Remote and Feedback Control of the Flap Angle in a Wind Tunnel Test Model by Optical Measurement

Aerospace ◽

10.3390/aerospace7020011 ◽

2020 ◽

Vol 7 (2) ◽

pp. 11

Author(s):

Kazuhisa Chiba ◽

Tatsuro Komatsu ◽

Hiroyuki Kato ◽

Kazuyuki Nakakita

Keyword(s):

Feedback Control ◽

Wind Tunnel ◽

Optical Measurement ◽

Wind Tunnel Test ◽

Measurement Technology ◽

Test Model ◽

Measurement Equipment ◽

Feedback Control System ◽

Aerodynamic Coefficients ◽

Japan Aerospace Exploration Agency

We have developed a remote and precise feedback control system using optical measurement technology to alter the angle of a flap, which is part of a wind tunnel test model, automatically and to earn the aerodynamic data efficiently. To rectify the wasteful circumstance that Japan Aerospace Exploration Agency (JAXA)’s low-turbulence wind tunnel stops ventilation every time to switch model configurations, we repaired hardware for remote operation and generated software for feedback control. As a result, we have accomplished a system that dramatically advances the efficiency of wind tunnel tests. Moreover, the system was able to consider the deformation of the model through optical measurement; the system controlled flap angles with errors less than the minimum resolution of optical measurement equipment. Consequently, we successfully grasped the nonlinearity of three aerodynamic coefficients C L , C D , and C M p that was impossible so far.

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A Study on the Flows of Dilute Polymer Solutions : 4th Report, On the Velocity Measurement by a Pitot Tube Method

Bulletin of JSME ◽

10.1299/jsme1958.17.1594 ◽

1974 ◽

Vol 17 (114) ◽

pp. 1594-1601

Author(s):

Yoshihiro MOCHIMARU ◽

Yukio TOMITA

Keyword(s):

Velocity Measurement ◽

Polymer Solutions ◽

Pitot Tube ◽

Dilute Polymer Solutions

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Pitot Tube and Wind Tunnel Studies of the Flow Induced by a One Atmosphere Uniform Glow Discharge Plasma (OAUGDP) Actuator

IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science ◽

10.1109/plasma.2005.359190 ◽

2005 ◽

Author(s):

M. Yadav ◽

Xin Dai ◽

J. Reece Roth

Keyword(s):

Wind Tunnel ◽

Glow Discharge ◽

Discharge Plasma ◽

Pitot Tube ◽

Glow Discharge Plasma

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Demonstration and uncertainty analysis of synchronised scanning lidar measurements of 2-D velocity fields in a boundary-layer wind tunnel

Wind Energy Science ◽

10.5194/wes-2-329-2017 ◽

2017 ◽

Vol 2 (1) ◽

pp. 329-341 ◽

Cited By ~ 7

Author(s):

Marijn Floris van Dooren ◽

Filippo Campagnolo ◽

Mikael Sjöholm ◽

Nikolas Angelou ◽

Torben Mikkelsen ◽

...

Keyword(s):

Wind Tunnel ◽

Uncertainty Analysis ◽

Wind Turbine ◽

Short Range ◽

Goodness Of Fit ◽

Wind Tunnels ◽

Small Scale ◽

Measurement Technology ◽

Lidar Measurement ◽

Hot Wire

Abstract. This paper combines the research methodologies of scaled wind turbine model experiments in wind tunnels with short-range WindScanner lidar measurement technology. The wind tunnel at the Politecnico di Milano was equipped with three wind turbine models and two short-range WindScanner lidars to demonstrate the benefits of synchronised scanning lidars in such experimental surroundings for the first time. The dual-lidar system can provide fully synchronised trajectory scans with sampling timescales ranging from seconds to minutes. First, staring mode measurements were compared to hot-wire probe measurements commonly used in wind tunnels. This yielded goodness of fit coefficients of 0.969 and 0.902 for the 1 Hz averaged u and v components of the wind speed, respectively, validating the 2-D measurement capability of the lidar scanners. Subsequently, the measurement of wake profiles on a line as well as wake area scans were executed to illustrate the applicability of lidar scanning to the measurement of small-scale wind flow effects. An extensive uncertainty analysis was executed to assess the accuracy of the method. The downsides of lidar with respect to the hot-wire probes are the larger measurement probe volume, which compromises the ability to measure turbulence, and the possible loss of a small part of the measurements due to hard target beam reflection. In contrast, the benefits are the high flexibility in conducting both point measurements and area scanning and the fact that remote sensing techniques do not disturb the flow during measuring. The research campaign revealed a high potential for using short-range synchronised scanning lidars to measure the flow around wind turbines in a wind tunnel and increased the knowledge about the corresponding uncertainties.

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Advanced Wind Tunnel Measurement Technology

Springer Aerospace Technology - Prediction and Validation Technologies of Aerodynamic Force and Heat for Hypersonic Vehicle Design ◽

10.1007/978-981-33-6526-1_7 ◽

2021 ◽

pp. 181-247

Author(s):

Min Zhao

Keyword(s):

Wind Tunnel ◽

Measurement Technology ◽

Wind Tunnel Measurement

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An Air Flow Rig for Use in Hot Element and other Anemometer Experiments

International Journal of Electrical Engineering Education ◽

10.1177/002072098302000217 ◽

1983 ◽

Vol 20 (2) ◽

pp. 169-176

Author(s):

M. J. Turner

Keyword(s):

Wind Tunnel ◽

Transient Response ◽

Air Flow ◽

Pitot Tube ◽

Hot Wire

An apparatus used in undergraduate instrumentation teaching is described. A small wind tunnel creates air speeds up to 12 m/s. A Pitot tube is used as a reference against which a hot wire anemometer is compared for linearity and transient response. The experiment serves to introduce non-ideal systems.

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