0.9 m wind tunnel
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The 0.9 m wind tunnel was originally a 1/10th scale model of the 9 m wind tunnel and, has for several decades, served the industrial and research communities.
In its current form, the wind tunnel accommodates a closed- or ¾-open-jet test section of 1.0 m width and 0.8 m height. The wind tunnels wind speed ranges from 0 to 44m/s and has particle image velocimetry (PIV) capability.
The relatively small size of the facility enables it to be used for prototype development of capabilities which can be later integrated into the 9 m and 2 m x 3 m wind tunnels.
Recently, NRC developed a small-scale Flow Treatment System (FTS), to be installed in the 9 m wind tunnel. The FTS will provide turbulent wind conditions representative of what is experienced by ground vehicles on Canadian highways. The effects of different turbulence-generating devices were evaluated for their influence on a typical tractor-trailer combination. An updated data acquisition system provided high-speed measurements for a combination of fast-response pressure probes to investigate the turbulent winds, a lightweight model matched to a cruciform balance and turntable to evaluate the dynamic loads experienced by the tractor-trailer, and a pressure model examined the unsteady surface pressures on the tractor trailer.
The 0.9 m wind tunnel circuit has been upgraded with acoustically treated turning vanes by lining the plenum chamber with acoustic wedges and therefore reducing the background noise levels in the test section. This has transformed the tunnel into an excellent facility to perform detailed acoustic measurements of small-scale models for both the aerospace and automotive communities.
Acquired by a high channel count phased microphone array, these acoustic measurements can be used to locate the dominant sound sources of a wind tunnel model allowing for the exploration of noise reduction techniques, ultimately resulting in a quieter aircraft or road vehicle. When combined with aerodynamic data acquired simultaneously, the acoustic data can highlight areas of high drag, key information in increasing fuel efficiency.
The facility is also used to calibrate a wide range of flow-measurement equipment for commercial and public sector clients.
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