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Reduce Aerodynamic Drag with "Riblets"<img alt="" src="https://www.cira.it/PublishingImages/test%20riblets.jpg" style="BORDER:0px solid;" />https://www.cira.it/en/communication/news/test-riblets-al-pt1/Reduce Aerodynamic Drag with "Riblets"Reduce Aerodynamic Drag with "Riblets"<p style="text-align:justify;">Tests have now concluded in CIRA's PT1 transonic wind tunnel for the Airgreen2 project, funded by the European Union under the Clean Sky 2 programme. The purpose of the campaign is to evaluate the potential role of riblets in helping to reduce aerodynamic drag, thus cutting fuel consumption and lessening environmental impact.</p><p style="text-align:justify;">These riblets are micro grooves in the direction of the flow, which, if applied to the outer surface of planes, would lead to a reduction in the coefficient of friction.</p><p style="text-align:justify;">Those used in this test campaign are like self-adhesive sheets, just a few microns in thickness and featuring saw-tooth grooves. These sheets were supplied by the Austrian company, Bionic Surface Technologies, and were applied to a two-dimensional model of the CAST 7 profile. This was then tested at different flow speeds (with Mach between 0.52 and 0.76 and Reynolds numbers around 2 million).</p><p style="text-align:justify;">Resistance measurements were obtained by use of a wake rake, and work will now proceed with detailed analysis of the results.<br></p><p style="text-align:justify;">November 14th, 2017<br></p><p><br></p>2017-11-13T23:00:00Z

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