?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Low+Speed+Wind+Tunnel+Testing+of+Aerofoil+Family+for+Solar+Powered+Aircrafts+&rft.creator=Jarzabek%2C+Artur&rft.contributor=Gonz%C3%A1lez+Hern%C3%A1ndez%2C+Miguel+%C3%81ngel&rft.contributor=Baiz+Villafranca%2C+Pedro&rft.subject=Renewable+Energy&rft.subject=Aeronautics&rft.description=The+scope+of+this+report+covers+the+design+and+testing+of+a+low+Reynolds+number+aerofoil+family+used+for+aircrafts+propelled+by+solar+energy.+The+main+constrain+is+the+top+surface+which+is+defined+by+the+mechanical+properties+of+the+solar+cells+and+has+a+significant+effect+on+the+aerodynamics+of+the+whole+aerofoil.+The+aim+was+to+provide+reliable+data+which+are+in+general+sparingly+available+due+to+the+fact+that+the+technology+is+recent+and+not+widely+shared.+Another+objective+was+to+upgrade+the+aerodynamic+parameters+of+the+aerofoil+by+using+modifications+that+included+gurney+flaps%2C+in-plane+gurney+flaps%2C+trailing+edge+wedges%2C+and+lower+surface+modifications.+Finally%2C+using+an+iterative+process+the+best+configuration+could+be+found+and+the+data+were+used+to+improve+the+low-speed+analytical+model+used+to+design+aerofoils+for+solar+powered+models.+The+reports+treats+broadly+about+the+experimental+technique+used+to+test+the+aerofoil+and+problems+encountered+during+low-speed+wind+tunnel+testing.++The+baseline+aerofoil+was+designed+to+operate+at+400000+to+600000+Reynolds+number+and+generate+the+coefficient+of+lift+(cL)+between+0.7+and+0.9.+The+plain+aerofoil+without+any+modifications+reached+an+aerodynamic+efficiency+(cL%2FcD)+of+81+at+0.83+cL.+It+had+a+negative+pitching+moment+(-0.12+for+low+Re)+which+further+decreased+for+high+Re+(-0.57+at+2000000Re).+Surface+flow+visualisation+test+revealed+that+there+is+a+separation+bubble+at+about+2%25+x%2Fc+and+that+separation+occurs+at+the+bottom+surface+at+about+40%25x%2Fc.+Parts+designed+to+remove+the+latter+phenomenon+proved+to+be+aerodynamically+inefficient+(maximum+cL%2FcD+of+71).+The+best+improvement+was+the+in-plane+serrated+2%25+gurney+flap%2C+which+achieved+140+cL%2FcD+at+0.71+cL.+The+0.8%25+gurney+flap+also+showed+an+increase+in+the+aerodynamic+efficiency+(109+cL%2FcD+at+0.81+cL).+Due+to+the+time+constrains+of+none+of+the+leading+edge+devices+could+be+checked.+This%2C+apart+from+further+testing%2C+should+be+the+main+aim+for+future+research.+&rft.publisher=E.T.S.I.+Aeron%C3%83%C2%A1uticos+(UPM)&rft.rights=https%3A%2F%2Fcreativecommons.org%2Flicenses%2Fby-nc-nd%2F3.0%2Fes%2F&rft.date=2011&rft.type=info%3Aeu-repo%2Fsemantics%2FbachelorThesis&rft.type=Final+Project&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=eng&rft.rights=info%3Aeu-repo%2Fsemantics%2FopenAccess&rft.identifier=https%3A%2F%2Foa.upm.es%2F7428%2F