Heaving motions of a ram wing translating above water |
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| Affiliation: | 1. Siberian Federal University, Krasnoyarsk, Russia;2. Novosibirsk State University of Architecture and Civil Engineering, Novosibirsk, Russia;3. Kutateladze Institute of Thermophysics, SB RAS, Novosibirsk, Russia;1. Center for Health Ethics and Law, West Virginia University, Morgantown, WV;2. Center for Policy and Research in Emergency Medicine, Oregon Health and Science University, Portland, OR;3. West Virginia Center for End-of-Life Care, Morgantown, WV;1. University of Pittsburgh, Department of Mechanical Engineering and Material Science, 225 Benedum Hall, Pittsburgh, PA 15261, United States;2. University of Pittsburgh, Department of Mechanical Engineering and Material Science, 153 Benedum Hall, Pittsburgh, PA 15261, United States |
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| Abstract: | Some high-speed marine vehicles utilize wings operating in the air but in close proximity to the water. At small clearances under the wings, and with augmentation of the incident airflow by front air-based propulsors, water surface deformations can influence the aerodynamic characteristics of such lifting surfaces. A dynamic model is developed in this paper for unsteady forces on a two-dimensional ram wing. The current model is based on the extreme-ground-effect theory for airflow and a linearized potential flow theory for water surface deformations. Parametric results are presented for aerodynamic characteristics of a flat plate, including a static lift coefficient, sensitivity on height, and added mass and damping coefficients in heaving motions. Variable parameters include relative speed, airflow augmentation, and frequency and amplitude of heaving oscillations. The developed method can be applied for more general dynamic modeling of high-speed air-supported marine craft. |
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