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Drag force and drag coefficient
Published in Mohammad H. Sadraey, Aircraft Performance, 2017
High-lift devices (HLDs) are parts of the wing to increases lift when employed (i.e., deflected). They are usually employed during takeoff and landing. Two main groups of HLDs are trailing edge HLDs (often called flap) and leading edge HLDs (e.g., slat). There are many types of wing trailing edge flaps such as split flap, plain flap, single-slotted flap, fowler flap, double-slotted flap, and triple-slotted flap. They are deflected down to increase the camber of the wing, in order to increase lift, so the maximum lift coefficient, CLmax, will be increased. The most effective method used on large transport aircraft is the leading edge slat. A variant on the leading edge slat is a variable camber slotted Kruger flap used on Boeing 747 (Figure 8.12b). The main effect of the wing trailing edge flap is to increase the effective angle of attack of the wing without actually pitching the airplane. The application of HLDs has a few negative side effects, including an increase in aircraft drag (as will be included in CDo). Flap deflection of up to 15° primarily produces lift with minimal drag.
Fluid Mechanics
Published in Raj P. Chhabra, CRC Handbook of Thermal Engineering Second Edition, 2017
Stanley A. Berger, Stuart W. Churchill, J. Paul Tullis, Blake Paul Tullis, Frank M. White, John C. Leylegian, John C. Chen, Anoop K. Gupta, Raj P. Chhabra, Thomas F. Irvine, Massimo Capobianchi
Flaps are movable sections near the trailing edge of a wing. They extend and/or deflect to increase wing area and/or increase wing camber (curvature), to provide higher lift than the clean wing. Many aircraft also are fitted with leading edge slats which open to expose a slot from the pressure side of the wing to the upper surface. The open slat increases the effective radius of the leading edge, improving maximum lift coefficient. The slot allows energized air from the pressure surface to flow into the low-pressure region atop the wing, energizing the boundary layers and delaying separation and stall.
Technologies
Published in Henry H. Perritt, Eliot O. Sprague, Domesticating Drones, 2016
Henry H. Perritt, Eliot O. Sprague
In fixed-wing drones, aircraft control possibilities are the same as for airplanes. The DROP can change the shape of the airfoil by extending flaps, or by moving control surfaces such as ailerons, elevators, and the rudder. Flaps are surfaces built in to the wing near the trailing edge that can be lowered or raised. As they are lowered, they generate additional lift at any given angle of attack. Ailerons are used to roll the aircraft—to cause it to rotate about an axis represented by a line drawn from the nose to the tail. They function by causing one wing to generate more lift and the other to generate less lift.
Optimum design of stenter machine hot air supply chamber by coupling CFD & DOE
Published in The Journal of The Textile Institute, 2023
Miguel Thomas Yaovi Adankpo, Zhong Xiang, Huang Ye Feng, Miao Qian
The preliminary investigation process shows that the airflow pattern can be significantly modified by adding an obstacle into the chamber to deviate a certain part of the airflow that is stuck together due to the dynamic viscosity effect. The obstacle in the chamber plays almost the same role as the airplane flaps positioned at the wings’ trailing edges (Figure 5). Those flaps are used to increase the plane’s lift by deviating the air flowing through the wings.
Bird strike assessment for a composite wing flap
Published in International Journal of Crashworthiness, 2018
S. Orlando, F. Marulo, M. Guida, F. Timbrato
The movement of the flaps is achieved through an actuator drive unit which drives the flaps along their inner and outer flap tracks from a retracted position at 0 degrees, through deployment angles of 10, 15, 20 and 37 degrees, as reported in Figure 3. The test specimen consists of the flap body and the flap-to-flap track interface components only, whereas, the test rig includes dummy tracks and flap-to-flap track interfaces.