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80 47 3 1396 !"# 105 - 111 * : [email protected] : ! 05 / 06 / 94 :() ! 18 / 11 / 94 &’( )*’+, - ./ 0’1 2 .34’* 52 6* 78 0015 NACA 59 :’! 1 2 ;1’ 3 59<=>2 ? @ AA *? B*’ CD , -, ./0 1 -2 3 40 56 .7- 7- 8 ?*-( * - 3 -2 1 40 56 .7- 8 7- ’* 1 F33D 0 1 -2 3 40 56 .7- 7- 8 G 9:; <6 = > ?-@ A; BC C .DE FGF HC -- HI J . F K: LM . M 8 N- N, -C . A; P 87 PQ?D ?-@ L7 : R< C N, NS E T U - V W X T NACA0015 NY - G?6 .D . 0 3 / 5 5 / 11 5 / 17 -C - , .C E T U P2C R< L7 C 8 WVC K: LM 8 \H] 8M NC - - - C . R< 0 . X NACA0015 A; 6 ?-@ P, ,C -; C C : NC/ N N-- ^ I /- 1 - _‘- >J J ^- X > LM K: HI 8M 0 6 3 X . 6 - X T -C E >a .D Y 2b F FGF -- HC G?6 . NC 8NY NC NC .N^ >Nc NC Y aN- 7N dN COMSOL , - . <*2 :5I 59 R< 8Y C C X6 8M C X LM K: NACA0015 . Time Dependent Solution of Variation of Lift Coefficient and Separation Point on NACA0015 Airfoil by Plasma Actuator with the Sine, Square and Triangular Voltage Types S. Khanian Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran N. Rezazadeh Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran A. B. Khoshnevis Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran Abstract In present study the effects of plasma actuation on the position of the separation point by using the different types of voltage functions including the sinusoid, square and triangular has been investigated. Also, the ability of this actuator for increasing the lift coefficient of airfoil NACA 0015 at angles of attack 0, 5.3, 11.5 and 17.5 has been studied and the best voltage function type for increasing of lift coefficient and removing or weakening the separation point has been determined. At first the pressure coefficient over the airfoil was calculated when actuation was applied and was validated by comparing with experimental data of Sosa. Then the variation of the velocity profiles and position of separation point in the three regions over the airfoil and a region behind the airfoil according to the voltage types sinusoid, square and triangular for different angles of attack have been predicted time-dependent numerically by COMSOL Multiphysics. Keywords; Time dependent resolution, Plasma actuator, Lift coefficient, Separation point, NACA 0015 airfoil. 1 - 8 N,C 3 dG^ 52 >^< Y 8M T eK- . 8M T Y Gc WD . f LNM T D gK- P ( .,C .D 8M T LNhC N- C TNH Ni TH 5: , ( b1 . i .D TN .C TH NG?M Y ND @0 . .E Wc C Y 8M P N- Y j Y ^ G?6 Y J C N - D D1 80 j Y a 5D ( .D .ND d7 BI TH N- VNj PN?D C BKI A; 8 A; C .Y C M Y .D .N- N1 >Nc TH ( Y A; 8M TH T .D 3ND .D .,C A; P D T C KI D .D L7 C 7 D 8 P _‘- C >S 8N 6 C dNM . 8b N >Na .ND - k, ,C >a .D 1 . C >S NC NC >S PN Nj Fj RM D , 8 N, N NM .D N NC 3b . 6 3 P N f N P?2C 3 ND RM eKN- N7 NM XNCI N?/6 . 3 , , / N XN: D >S C 5 .N 3N N/ 37 8M M / N RNM , N6 N, . NNN LDNNN LNNNM 3NNN7 .NNN, W)NNN6 NNN .NNND D N 5N N: 8M >, N N,C XC: VJ .D Y 8 .D Nl WNc

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Page 1: 59 :’! 1 NACA 0015 .˛34’˛* 52 6˛* ˘ 78 2 0’1

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COMSOL �������, -� .

�<*2 :5���I 5�9 R�< �8��Y �C ��C�� X6 ����� ������ 8��M�CX�� �� �L���M �K:� � NACA0015.

Time Dependent Solution of Variation of Lift Coefficient and Separation Point on NACA0015 Airfoil by Plasma Actuator with the Sine, Square and Triangular Voltage

Types

S. Khanian Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran

N. Rezazadeh Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran

A. B. Khoshnevis Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran

Abstract In present study the effects of plasma actuation on the position of the separation point by using the different types of voltage functions including the sinusoid, square and triangular has been investigated. Also, the ability of this actuator for increasing the lift coefficient of airfoil NACA 0015 at angles of attack 0, 5.3, 11.5 and 17.5 has been studied and the best voltage function type for increasing of lift coefficient and removing or weakening the separation point has been determined. At first the pressure coefficient over the airfoil was calculated when actuation was applied and was validated by comparing with experimental data of Sosa. Then the variation of the velocity profiles and position of separation point in the three regions over the airfoil and a region behind the airfoil according to the voltage types sinusoid, square and triangular for different angles of attack have been predicted time-dependent numerically by COMSOL Multiphysics. Keywords; Time dependent resolution, Plasma actuator, Lift coefficient, Separation point, NACA 0015 airfoil.

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