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91 50 2 1399 "#$ 143 - 151 ’()* - 10.2210.22034/jmeut.2020.9848 DOI: * : [email protected] : ! 05 / 03 / 97 :() ! 16 / 02 / 98 +" , - )./ 0.-1. 2 ) - 3 4 56’ 4( 7 2 8)- 2 .9( : ;- < : == - - 489> ?8 / 0.-1. @" A -B C. . ./0 1 23 45 23 6037 85 8 D7 E +FG * 4 1 45 23 6037 23 85 8 I" J 4 23 0 60 9: ;< 85 8 45 .- 4 = 8 >[email protected] 0 8 85 85 60 K AB0 3 . C 3 D E E . F?F GE 5H IEJ KE 0 4LE >63 M N O = . J = QN R M 4 O = . 3 G C D . F?F GE 60 E H 3 . S [email protected] > E D3 E 8Q . E/ TAE I E @4 U ;E E OE 8O VKQ . E W O ) E I .1 J ;K 2 / 2 8 / 2 @4 FX 90 M E Y .:E T 0 8 H 8 D Z4 Q O 8O VKQ 2 / 0 T: Q < T:0[ H 8 X VKQ S 8O VKQ 13 / 0 < :E 5 . . O TM ) = O \4 E C Y IEJ W\ E EM N\< : O4 . .4 : ] ?< ^3 E 4 80 O O = . S E ^ . . Q ^3 . S I ^ 01 0_ [ = [ T< E KL S ^ ‘ .4 S ^ a b X E KL O O ?< ^3 E = S ^ X .4 [ KL S S ^ a b O O ?< ^3 E E = : H 8S S ^ E1 /\ cBE H 3 ^ H 8 O . 4N ^3 dK4 O .4 : . E F ?DX 0 = < S ^ a b O E eE E ?DX 5 E 4 E H I H H 8 E1 . I . GE dK4 I :E D . = S < ^ E eE O ?DX 30 .4 E H L.) 4( 4; : E I : O4 O = F?F GE ba . Experimental investigation of angle of attack effects on aerodynamics characteristics of delta wing-body-vertical tail combination airplane model in ground effects Aerospace Engineering, Aerospace Institute, Tehran, Iran A. Ghajar Aerospace Engineering, Aerospace Institute, Tehran, Iran S. A. Seyed Shams Taleghani Department of Aerospace Engineering, University of Sharif, Tehran, Iran M. R. Soltani Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran M. Masdari Abstract Aerodynamic characteristics of an aircraft with delta wing are considerably affected under the ground effect in take-off and landing phases. In this research, static ground effect of a 60 degrees delta wing with axisymmetric sharp edges in combination of body and vertical tail at low speed wind tunnel are investigated. The wind tunnel is closed type has an opened test section that its dimensions is 2.8 m × 2.2 m and maximum velocity is 90 m/s. In these tests ground effect is simulated using a fixed plane that its height is variable. With decreasing the height from the ground plane, the lift force is increased, induced drag force is decreased, total drag force is increased and nose-down pitching moment is increased nonlinearly. The rate of increasing of lift coefficient in linear regions increased with decreasing of height from ground plane. At the positive angle of attack the most percentage increasing of lift coefficient is due to 5 degrees angle of attack as the result of existence of perfect vortex flow over the whole wing surface. The minimum case is due to 30 degrees of angle of attack. Keywords: Wind tunnel, Ground Simulator, Delta Wing, Aerodynamics Coefficients. 1 - + E/ =O M =4LE >63 3D3 D3 . ?< D3 J O =O E GE 9A O D . 8 LE I E AB0 =O E 8H .3 Y = .f E .3D3 .E . =O M N : 0 4LE .3O [email protected] : =O M .3 J M O H O . ?< 4 =E ?< g 3 J GE = ^3 GE O = ^S 8 M E 8H Y E / O = H . ^3 E ^S [email protected] : GE 8 = / .1 Y 5 U3 E O 8 : =O M 1H M O : =O M ] 1 f GE 3 O 1 - 2 1 KE [ ] 4 1 J ;K 3 - 6 .[ : =O M >S O AB0 Y 3 . l 4 0 Y GE mc I 0 E 4 = Wa = 8 ‘ I .4 GE =O JE EM GE 8 8H 8 I0 .DE 0 O I0 4 0 S \ = WD/ = O 4
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Transcript of 178 = >7 - ˜ -

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Experimental investigation of angle of attack effects on aerodynamics characteristics of
delta wing-body-vertical tail combination airplane model in ground effects
Aerospace Engineering, Aerospace Institute, Tehran, Iran A. Ghajar Aerospace Engineering, Aerospace Institute, Tehran, Iran S. A. Seyed Shams Taleghani Department of Aerospace Engineering, University of Sharif, Tehran, Iran M. R. Soltani Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran M. Masdari
Abstract Aerodynamic characteristics of an aircraft with delta wing are considerably affected under the ground effect in take-off and landing phases. In this research, static ground effect of a 60 degrees delta wing with axisymmetric sharp edges in combination of body and vertical tail at low speed wind tunnel are investigated. The wind tunnel is closed type has an opened test section that its dimensions is 2.8 m × 2.2 m and maximum velocity is 90 m/s. In these tests ground effect is simulated using a fixed plane that its height is variable. With decreasing the height from the ground plane, the lift force is increased, induced drag force is decreased, total drag force is increased and nose-down pitching moment is increased nonlinearly. The rate of increasing of lift coefficient in linear regions increased with decreasing of height from ground plane. At the positive angle of attack the most percentage increasing of lift coefficient is due to 5 degrees angle of attack as the result of existence of perfect vortex flow over the whole wing surface. The minimum case is due to 30 degrees of angle of attack. Keywords: Wind tunnel, Ground Simulator, Delta Wing, Aerodynamics Coefficients.
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