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Aerodynamic Analysis of High-Speed Compound Unmanned Rotorcraft Using an Unstructured Flow Solver
박상현,권오준,이상봉 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.4
In the present study, numerical simulations of a high-speed compound unmanned rotorcraft were carried out by employing an unstructured Reynolds-Averaged Navier–Stokes solver. For the simulations, a conceptually designed rotorcraft was used which includes two propellers, a fuselage with main and tail wings and a co-axial rotor. Aerodynamic characteristics of the propulsion components were studied by comparing aerodynamic coefficients with the following modes: hovering, transitional low-speed, high-speed, and maximum flight speed conditions. Furthermore, the effects of the fluid dynamic interactions between the co-axial rotor, propellers, and wings were investigated. Lastly, the impact of ground on the aerodynamic performance on the rotorcraft was studied.
비정렬 및 적응 직교격자를 이용한 2차원 혼합격자계 유동해석 코드개발
정민규(M.K. Jung),권오준(O.J. Kwon) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
A two-dimensional hybrid flaw solver has been developed for the accurate and efficient simulation of steady and unsteady flaw fields. The flaw solver was cast to accommodate two different topologies of computational meshes. Triangular meshes are adopted in the near-body region such that complex geometric configurations can be easily modeled, while adaptive Cartesian meshes are utilized in the off-body region to resolve the flow more accurately with less numerical dissipation by adopting a spatially high-order accurate scheme and solution-adaptive mesh refinement technique. A chimera mesh technique has been employed to link the two flow regimes adopting each mesh topology. Validations were made for the unsteady inviscid vortex convection and the unsteady turbulent flows over an NACA0012 airfoil, and the results were compared with experimental and other computational results.