Leading-edge Slat Optimization for Maximum Airfoil LiftNational Aeronautics and Space Administration, Scientific and Technical Information Office, 1979 - Aerofoils - 28 pages |
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Page 15
... C & m ' m C & f 13 ° 19 ° 2.84 0.57 24 ° 2.24 0.39 1.62 2.00 0.27 3.19 0.68 2.23 0.28 0.23 .2 .4 .6 .8 1.0 1.2 1.4 x / c Figure 3.- Airfoil pressure distributions with slat positioned to minimize the suction peak on main ... xs / c , Ys / 15.
... C & m ' m C & f 13 ° 19 ° 2.84 0.57 24 ° 2.24 0.39 1.62 2.00 0.27 3.19 0.68 2.23 0.28 0.23 .2 .4 .6 .8 1.0 1.2 1.4 x / c Figure 3.- Airfoil pressure distributions with slat positioned to minimize the suction peak on main ... xs / c , Ys / 15.
Page 16
... xs / c , Ys / c SKIN - FRICTION COEFFICIENT AT TRAILING EDGE OF MAIN AIRFOIL , Cfm SLAT DEFLECTION , 20 .02 -.02 Бәр ' sg -34 -36 K SEPARATION ON MAIN COMPONENT 0 ) ( C & m = Y./c xs / c -38 12 14 16 18 20 ANGLE OF ATTACK , a , deg 22 ...
... xs / c , Ys / c SKIN - FRICTION COEFFICIENT AT TRAILING EDGE OF MAIN AIRFOIL , Cfm SLAT DEFLECTION , 20 .02 -.02 Бәр ' sg -34 -36 K SEPARATION ON MAIN COMPONENT 0 ) ( C & m = Y./c xs / c -38 12 14 16 18 20 ANGLE OF ATTACK , a , deg 22 ...
Page 19
... and experimental pressure distributions near stall with a section lift coefficient of 3.1 : 85 = -42 ° , xs / c = -0.01 , ys / c 8 , Re 3.8X106 . = S S MAXIMUM LIFT COEFFICIENT , CLMAX 3.4 3.3 3.2 3.1 3.0 19 -118 ...
... and experimental pressure distributions near stall with a section lift coefficient of 3.1 : 85 = -42 ° , xs / c = -0.01 , ys / c 8 , Re 3.8X106 . = S S MAXIMUM LIFT COEFFICIENT , CLMAX 3.4 3.3 3.2 3.1 3.0 19 -118 ...
Common terms and phrases
80-Foot Wind Tunnel adverse pressure gradient aerodynamic analysis aerodynamic calculation Ames 40 Ames Research Center angle of attack aspect ratio boundary-layer analysis boundary-layer coordinate system boundary-layer equations CLMAX Computer Sciences Corporation configurations confluent boundary layer constrained function minimization constraint coupling potential flow design procedure determining the position displacement effect eddy viscosity Effect of slat experimentally optimized slat finite-difference flow and boundary-layer flow field high-lift incipient flow separation iteratively coupling potential laminar instability LEADING-EDGE SLAT OPTIMIZATION main airfoil main element maximizes the lift MAXIMUM AIRFOIL LIFT MAXIMUM LIFT COEFFICIENT measured maximum lift minimizes the suction Moffett Field multielement airfoils NASA numerical procedure optimized slat position position for maximum position that minimizes prediction of incipient PRESSURE COEFFICIENT pressure distributions Reynolds number Reynolds stress single-slotted flap slat deflection SLAT LOCATION slat wake suction peak theoretical predictions theoretically optimized turbulent reattachment wind-tunnel testing wing maximum lift x/c Figure xs/c Ys/c