The effect of HHC on the vortex convection in the wake of a helicopter rotor |
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| Affiliation: | 1. Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;2. Center for Frontier Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;1. Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad 38000 (Pakistan);2. Earth Sciences Department, King Fahd University of Petroleum and Minerals, Dhahran 31261 (Saudi Arabia);1. Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan;2. Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-Cho, Ikoma, Nara 630-0192, Japan;1. National Institute for Cryogenic and Isotopic Technologies, Street Uzinei No.4, P.O Râureni, P.O. Box 7, 240050 Rm.Vâlcea, Romania;2. Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, SI-1000 Ljubljana, Slovenia;1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran;3. Department of Chemical Engineering, Middle East Technical University, Ankara, Turkey |
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| Abstract: | Based on wind tunnel data the origin and the influence of active rotor control on the wake geometry in the rotor disk are determined. The test data show that the changes in blade-vortex interaction locations due to higher harmonic control are not primarily caused by different blade motions but mainly from different vortex flight paths. Using combined momentum and blade element theory, a model for the induced velocities caused by higher harmonic control is derived. The integration of the vortex flight path within this induced velocity field provides displacements of the vortices that lead to significant changes in the blade-vortex interaction locations. The results are validated by wind tunnel data, and it is proven that the influence of higher harmonic control on vortex geometry and therewith the noise emission characteristics can be predicted using this methodology. Thus the time consuming procedure of computing the wake geometry by free-wake analysis may be omitted for parameter variation studies, since the wake geometry can be predicted approximately in advance. |
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