Young-Hyun You/Jae-Sang Park/Sung-Nam Jung/Do-Hyung Kim
International Journal of Aeronautical and Space Sicences, vol. 11, no. 2, pp.145-153, 2010

Abstract : In this work, the comprehensive structural dynamics (CSD) codes including DYMORE and CAMRAD II are used to validate the higher harmonic control aeroacoustic rotor test (HART) II data in descending flight condition. A total of 16 finite elements along with 17 aerodynamic panels are used for the CAMRAD II analysis, whereas in the DYMORE analysis, 10 finite elements with 31 equally-spaced aerodynamic panels are utilized. To improve the prediction capability of DYMORE analysis, the finite state dynamic inflow model is upgraded with a free vortex wake model comprised of near shed wake and trailed tip vortices. The predicted results on aerodynamic loads and blade motions are correlated with the HART II measurement data for the baseline (BL), minimum noise (MN), and minimum vibration (MV) cases. It is found that an improvement of solution, especially for BVI (Blade Vortex Interaction) airloads, is achieved with the free wake method employed in the DYMORE analysis. Overall, fair to good correlation is achieved for the test cases considered in this study.

Keyword : HART II, comprehensive structural dynamics code, BVI airloads, aeroelastic response