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Aerodynamic performance of an over-the-wing propeller configuration at increasing Mach number

Content Provider	Springer Nature Link
Author	Müller, L. Kožulović, D. Radespiel, R.
Copyright Year	2014
Abstract	Over-the-wing propeller configurations and particularly channel wing concepts show increased climb performance, and through effective acoustic shielding, reduced noise emissions when compared to a conventional tractor configuration. The main aerodynamic mechanisms could be identified by steady flow simulations of a simplified wing geometry and actuator disk. At take-off, where the thrust coefficient is very high, the drag of the wing decreases much stronger than the thrust of the propeller. This paper investigates the cruise conditions where the thrust coefficient is by one order of magnitude lower. The numerical results give evidence that, even at a moderate flight Mach number of 0.6, the beneficial influence of the over-the-wing propeller on the drag coefficient of the wing is negligibly small. On the other hand, the amount of propeller efficiency that is lost through high inflow velocity above the wing increases with Ma due to compressibility effects. As a result, the propulsive efficiency of an over-the-wing configuration is 16 % smaller than the reference (tractor). Semi-empirical correlations show that even at very low Mach numbers a drawback of at least 5 % remains. Although repositioning the propeller at the wing trailing edge may recover 4 % of the propulsive efficiency at Ma = 0.6, it is not advisable to give up most of the noise-shielding effect at take-off which is an important advantage of the channel wing.
Starting Page	305
Ending Page	317
Page Count	13
File Format	PDF
ISSN	18695582
Journal	CEAS Aeronautical Journal
Volume Number	5
Issue Number	3
e-ISSN	18695590
Language	English
Publisher	Springer Vienna
Publisher Date	2014-04-10
Publisher Institution	Council of European Aerospace Societies
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Propeller Over-the-wing Channel wing Integration High-speed Aerodynamic Aerospace Technology and Astronautics
Content Type	Text
Resource Type	Article
Subject	Transportation Aerospace Engineering

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