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An experimental investigation of airfoils with perforated Gurney-type flaps.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	An experimental investigation of airfoils with perforated Gurney-type flaps./
作者:	Ko, Lok Sun.
面頁冊數:	71 p.
附註:	Source: Masters Abstracts International, Volume: 49-06, page: 4008.
Contained By:	Masters Abstracts International49-06.
標題:	Engineering, Aerospace. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MR74819
ISBN:	9780494748190

An experimental investigation of airfoils with perforated Gurney-type flaps.
Ko, Lok Sun.

An experimental investigation of airfoils with perforated Gurney-type flaps. - 71 p.

Source: Masters Abstracts International, Volume: 49-06, page: 4008.

Thesis (M.Eng.)--McGill University (Canada), 2011.

The Gurney flap can provide an increase in lift with a small drag penalty up to a flap height of approximately 3% of the chord. For flap height larger than 3% chord (herein referred to as Gurney-type flap), there is a significant increase in drag, causing a deteriorating lift-to-drag ratio. In this work, perforation was introduced in large Gurney-type flaps in an attempt to improve their aerodynamic performance. A study of different flap heights and perforation porosities were performed by using force balance, surface pressure and hot-wire measurements in conjunction with particle image velocimetry (PIV). Results show that flap porosity reduced lift in comparison to the solid flap due to the decrease in positive camber effects and decompression of the cavity flow up stream of the flap. The corresponding reduction in drag, however, outweighed the loss in lift and rendered an improved lift-to-drag ratio. Detailed PIV flow field behind the perforated flap revealed that the existence of perforation-generated jets are responsible for the observed differences in aerodynamic performance. If strong enough, perforation- generated jets could eliminate the vortex shedding process behind the flap. Furthermore, the near wake was found to be disrupted and narrowed, drastically suppressing fluctuation intensity.

ISBN: 9780494748190Subjects--Topical Terms:

845476
Engineering, Aerospace.

An experimental investigation of airfoils with perforated Gurney-type flaps.
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245 1 3 $a An experimental investigation of airfoils with perforated Gurney-type flaps.
300 $a 71 p.
500 $a Source: Masters Abstracts International, Volume: 49-06, page: 4008.
502 $a Thesis (M.Eng.)--McGill University (Canada), 2011.
520 $a The Gurney flap can provide an increase in lift with a small drag penalty up to a flap height of approximately 3% of the chord. For flap height larger than 3% chord (herein referred to as Gurney-type flap), there is a significant increase in drag, causing a deteriorating lift-to-drag ratio. In this work, perforation was introduced in large Gurney-type flaps in an attempt to improve their aerodynamic performance. A study of different flap heights and perforation porosities were performed by using force balance, surface pressure and hot-wire measurements in conjunction with particle image velocimetry (PIV). Results show that flap porosity reduced lift in comparison to the solid flap due to the decrease in positive camber effects and decompression of the cavity flow up stream of the flap. The corresponding reduction in drag, however, outweighed the loss in lift and rendered an improved lift-to-drag ratio. Detailed PIV flow field behind the perforated flap revealed that the existence of perforation-generated jets are responsible for the observed differences in aerodynamic performance. If strong enough, perforation- generated jets could eliminate the vortex shedding process behind the flap. Furthermore, the near wake was found to be disrupted and narrowed, drastically suppressing fluctuation intensity.
590 $a School code: 0781.
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