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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Missile and fighter aircraft have been challenged by low restoring nose-down pitching moment at high angle of attach. The consequence of weak nose-down pitching moment can be resulting in a deep stall condition. Especially, the pressure oscillation has a huge effect on noise generation, structure damage, aerodynamic performance and safety, because the flow has strong unsteadiness at high angle of attack. In this paper, the unsteady aerodynamics coefficients were analyzed at high angle of attack up to 50 degrees around two dimensional NACA0012 airfoil. The two dimensional unsteady compressible Navier-Stokes equation with a LES turbulent model was calculated by OHOC (Optimized High-Order Compact) scheme. The flow conditions are Mach number of 0.3 and Reynolds number of 10?. The lift, drag, pressure, entropy distribution, etc. are analyzed according to the angle of attack. The results of average lift coefficients are compared with other results according to the angle of attack. From a certain high angle of attack, the strong vortex formed by the leading edge are flowing downstream as like Karman vortex around a circular cylinder. The primary and secondary oscillating frequencies are analyzed by the effects of these unsteady aerodynamic characteristics.
목차
1. 서론
2. 지배방정식 및 수치기법
3. 결과 및 토의
4. 결론
참고문헌
참고문헌 (18)
참고문헌 신청
1. [학술지(정기간행물)] - Gursul, I. / 1992 / High aerodynamic loads on an airfoil submerged in an unsteady stream / AIAA 30 (4) : 1117 ~ 1119
2. [학술지(정기간행물)] - Shih, C. / 1994 / Vorticity balance and time scales of a two-dimentional airfoil an unsteady freestream / Phys.Fluid : 710 ~ 723
3. [학술지(정기간행물)] - Mehta, U.B. / 1975 / Starting Vortex, Separation Bubbles and Stall: a Numerical Study of Laminar Unsteady Flow Around Airfoil / Journal of Fluid Mechanics 67 : 227 ~ 256
4. [학술지(정기간행물)] - Sugavanam, A. / 1982 / Numerical Study of Separated Turbulent Flow over Airfoils / AIAA 20 (4) : 464 ~ 470
5. [단행본] - Wagner, H. / 2007 / Large-Eddy Simulation for Acoustics / CAMBRIDGE UNIVERSITY PRESS
2. [학술지(정기간행물)] - Shih, C. / 1994 / Vorticity balance and time scales of a two-dimentional airfoil an unsteady freestream / Phys.Fluid : 710 ~ 723
3. [학술지(정기간행물)] - Mehta, U.B. / 1975 / Starting Vortex, Separation Bubbles and Stall: a Numerical Study of Laminar Unsteady Flow Around Airfoil / Journal of Fluid Mechanics 67 : 227 ~ 256
4. [학술지(정기간행물)] - Sugavanam, A. / 1982 / Numerical Study of Separated Turbulent Flow over Airfoils / AIAA 20 (4) : 464 ~ 470
5. [단행본] - Wagner, H. / 2007 / Large-Eddy Simulation for Acoustics / CAMBRIDGE UNIVERSITY PRESS
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UCI(KEPA) : I410-ECN-0101-2014-500-003006915