• 한국항공우주학회지
• /
• 제35권2호
• /
• pp.165-170
• /
• 2007

날개-동체-카나드 형상 전투기급 항공기 개념설계 기간 동안, 항공기 기동성 증대 방안으로서 카나드-앞전플랩 스케줄링 효과에 대한 연구를 수행하였다. 본 연구에서는 고속 영역에서 카나드-앞전플랩 변위각에 의한 양항특성을 예측하기 위하여 보정된 초음속 패널 방법을 사용하였다. 예측된 양항곡선을 활용하여 카나드-앞전플랩 스케줄링 법칙을 설정하였다. 이러한 카나드-앞전플랩 스케줄 법칙은 양항비를 최대로 하는 카나드-앞전플랩 굽힘과 비행조건과의 관계이다. 카나드-앞전플랩 스케줄링에 의한 결과를 기초로, 제시된 방법은 날개-동체-카나드형상 전투기급 항공기의 기동성을 증대하는데 유용한 것으로 확인되었다.

• 한국전산유체공학회지
• /
• 제20권1호
• /
• pp.47-56
• /
• 2015

In this paper, we study the effect of various turbulence models by comparing the aerodynamic characteristics and the flow patterns computed for aircraft models. An in-house CFD solver, MSAPv, that solves the three dimensional RANS equations with the turbulence model equations is used. The turbulence models used in this study are the Spalart-Allmaras model, Menter's $k-{\omega}$ SST model, Coakley's $q-{\omega}$ model, and Huang and Coakley's $k-{\varepsilon}$ model. DLR-F6 WB and WBNP configurations are selected for the study. We concentrate on the separated flow pattern variations with the turbulence models at the wing-body junction and the wing-pylon junction as well as drag polar curves.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제11권1호
• /
• pp.225-232
• /
• 2019

In recent years, nonlinear dynamic models have been developed for flapping-type energy harvesting systems with a rigid wing, but not for those with a flexible wing. Thus, in this study, flexible wing designs of NACA0012 section are proposed and measurements of the forces of rigid cambered wings, which are used to estimate the performance of the designed wings, are conducted. Polar curves from the measured lift and drag coefficients show that JavaFoil estimation is much closer to the measured values than Eppler over the entire given range of angles of attack. As the camber of the rigid cambered wings is increased, both the lift and drag coefficients increase, in turn increasing the resultant forces. Moreover, the maximum resultant forces for all rigid cambered wings are achieved at the same angle of attack as the maximum lift coefficient, meaning that the lift coefficient is dominant in representations of the wing characteristics.