{"id":364,"date":"2014-05-09T16:43:25","date_gmt":"2014-05-09T16:43:25","guid":{"rendered":"http:\/\/fablab.hylas.be\/testsite\/?p=364"},"modified":"2014-05-11T00:58:49","modified_gmt":"2014-05-11T00:58:49","slug":"windtunnel-design-construction-part-2-design","status":"publish","type":"post","link":"http:\/\/aeromodeller2.hylas.be\/?p=364","title":{"rendered":"Windtunnel Design & Construction – part 2: design"},"content":{"rendered":"

 <\/p>\n

For reasons of durability the design brief preferred a steel-walled wind tunnel.<\/p>\n

The tunnel was conceived as a series of self-supporting parts, to be bolted together.
\nEach of the wind tunnel component parts was to be built from lasercut steel parts.<\/p>\n

From right to left the wind tunnel consists of:<\/p>\n

-a bellmouth (a rounded inlet)
\n-several casings, which form the settling chamber and allow for the mounting of screens and honeycomb inbetween the casings.
\n-a contraction duct, which accelerates the air from the low-speed inlet to the high-speed test section
\n-a test section with reconfigurable extension parts
\n-a diffuser that provides a smooth transition from the rectangular test section to the round inlet of the fan
\n-an 11kW fan<\/p>\n

The entire tunnel is supported on a steel frame.
\nThe parts from the bellmouth up to the contraction duct are mounted on a rail system. This provides easy access to the screens<\/p>\n

The test section is mounted on castor wheels to allow for the exchange of test sections (two interchangeable test sections are to be built)<\/p>\n

Overall dimensions are:
\n-windtunnel length 10.3m
\n-inlet section 1750mm wide x 1250 mm high
\n-test section 700mm wide x 1250 mm high
\n-fan diameter 630mm<\/p>\n

\"test3ray_hdr2-edit\"<\/a><\/p>\n

The wind tunnel parts are made from 2mm steel walls, inside a frame made from 6mm thick lasercut pieces.<\/p>\n

The tunnel design was modeled in Autodesk Inventor. As the requested delivery date was relatively short, it was decided to start construction in parallel with developing the 3D-model.<\/p>\n

At the time the above rendering was made, the settling chamber boxes and the contraction duct had already been made.<\/p>\n

For dimensions and general design rules the following papers were useful:<\/p>\n

-James H. Bell and Rabindra D. Mehta, CONTRACTION DESIGN FOR\u00a0SMALL LOW-SPEED WIND TUNNELS, Stanford University, April 1988\u00a0<\/p>\n

R.D.Mehta and P. Bradshaw, Design rules for low speed wind tunnels, Aero. Journal (Royal Aeronautical Society), Vol. 73, p. 443 (1979).<\/p>\n","protected":false},"excerpt":{"rendered":"

  For reasons of durability the design brief preferred a steel-walled wind tunnel. The tunnel was conceived as a series of self-supporting parts, to be bolted together. Each of the wind tunnel component parts was to be built from lasercut steel parts. From right to left the wind tunnel consists of: -a bellmouth (a rounded […]<\/p>\n","protected":false},"author":1,"featured_media":344,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5,2],"tags":[],"_links":{"self":[{"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=\/wp\/v2\/posts\/364"}],"collection":[{"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=364"}],"version-history":[{"count":9,"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=\/wp\/v2\/posts\/364\/revisions"}],"predecessor-version":[{"id":530,"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=\/wp\/v2\/posts\/364\/revisions\/530"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=\/wp\/v2\/media\/344"}],"wp:attachment":[{"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=364"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/aeromodeller2.hylas.be\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}