The behaviour of the swept-wing attachment line boundary layer has been studied experimentally. Two-dimensional trip wires and turbulent flat plate boundary layers have been used as sources of disturbance and a wide range of conditions has been covered, ensuring that the results are directly applicable to full scale flight situations. Simple criteria have been deduced and these allow the state of the attachment line boundary layer to be determined for a given geometry and free stream conditions. The validity of calculations show that most of the present generation of civil aircraft have turbulent attachment lines in the cruise conditons. Although some benefit may be gained by the removal of root disturbances and the maintenance of a smooth leading edge the tolerable roughness heights are so small that it seems unlikely that turbulence can be prevented without some form of boundary layer suction.
Leading edge transition on swept wings
Grenzschichtstroemung an der Vorderkante von Pfeilfluegeln
1977
11 Seiten, 14 Bilder, 10 Quellen
Aufsatz (Konferenz)
Englisch
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