NUMERICAL INVESTIGATION OF AERODUNAMIC INTERFERENCE OF WING IN GROUND EFFECT AND POWER AUGMENTED RAM ON TAKEOFF MOTION MODE
Abstract
The Power Augmented Ram (PAR) effects on the aerodynamic characteristics of Lightweight Wing in Ground (LWIG) effect vehicle layout on the take-off motion mode is investigated. The technology of numerical simulation of ground effect aerodynamics (CFD-simulation) is exploited as a research instrument. In present study CFD-simulation is based on solving of Reynolds averaged Navier-Stokes equations for viscous turbulence incompressible flow, with k –k SST turbulence model. The full-scale aerodynamic layout of LWIG-vehicle with take-off weight 0,5-1 tones used for CFD-simulation includes wing and PAR-system consisting of a propeller, an annular nozzle, straightening vanes and a pylon for attaching to the fuselage. The mesh model created in ANSYS Fluent Meshing contains 33.7 million finite elements. The annular nozzle limits the region containing the rotor blades in which the condition for the rotation of the air is specified. In CFD-simulations for different values of LWIG vehicle motion speed the ground clearance is applied as a constant with 0,05 wing chord lengths. Using the results of CFD-simulation the thrust coefficient versus advance ratio, the drag coefficient and the lift-to-drag ratio of LWIG layout versus velocity dependency graphs are plotted. The dependency of the thrust coefficient versus advance ratio of propeller in the layout composition are in good agreement with the theoretical data. The dependencies of the drag coefficient and the lift-to-drag ratio versus velocity are non-linear, whereas the lift-to-drag ratio belongs to the range from 8 to 16 units. The diagrams of the aerodynamic flow speed distribution in a vertical section along the propeller axis at different values of motion velocity are presented. The diagrams show that with the increasing of LWIG velocity motion the PAR generated flow will be directed from bottom to upper surface of wing as a result of the aerodynamic interference of counterflux and PAR generated flow. It seems possible to neutralize this effect leading to lift-to-drag ratio and PAR efficiency decreasing by using the mechanism, which can change the installation angle of PAR in motion process.
References
Февральских А.В. Разработка методики проектирования аэрогидродинамической компоновки амфибийного судна на воздушной подушке с аэродинамической разгрузкой на основе численного моделирования: дис. … канд. техн. наук. – Нижний Новгород: НГТУ им. Р.Е. Алексеева, 2017. – 175 с.
Маскалик А.И. Экранопланы: транспортные суда 21 века / А.И. Маскалик, Р.А. Нагапетян, В.В. Иваненко, А.Г. Бутлицкий, В.В. Томилин, А.И. Лукьянов – СПб.: Судостроение, 2005. – 576с.
Rozhdestvensky K.V. Wing-in-ground effect vehicles / K.V. Rozhdestvensky // Progress in aerospace sciences – 2006. – № 42. – pp.211–283.
Hirata N. Numerical Study on the Aerodynamic Characteristics of a Three-Dimensional Power-Augmented Ram Wing in Ground Effect / Nobuyuki Hirata // Journal of the Society of Naval Architects of Japan. – 1996. –№ 179. –pp. 31–39.
Stern F.A Viscous Flow Approach to the Computation of Propeller-Hull Interaction / F. Stern, H.T. Kim, V.C. Patel, H.C. Chen // Journal of Ship Research – 1988. – Vol. 32. – No. 4. – pp. 246-262.
Zhigang Y. Complex Flow for Wing-in-ground Effect Craft with Power Augmented Ram Engine in Cruise / Yang Zhigang, Yang Wei // Chinese Journal of Aeronautics. – 2010. – № 23. – 2010. – pp. 1–8.
Tavakoli Dakhrabadi M. Hydro-aerodynamic mathematical model and multi-objective optimization of wing-in-ground effect craft in take-off / M.S. Seif, M. Tavakoli Dakhrabadi // Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment, 2017. – pp.1–13.
Kornev N. On Unsteady Effects in WIG Craft Aerodynamics / N. Kornev // International Journal of Aerospace Engineering – 2019. – pp.1–14.
Matveev K. I. Aero-Hydrodynamic Aspects of Power-augmented Ram Wings / K.I. Matveev // Journal of Ship Research – 2013. – № 57(2).– pp.86–97.
Mojtaba Tahani. Aerodynamic performance improvement of WIG aircraft / Mojtaba Tahani, Mehran Masdari, Ali Bargestan // Aircraft Engineering and Aerospace Technology. – 2017. – Vol. 89. – № 1. – pp.120–132.
Juhee Lee. Computational analysis of static height stability and aerodynamics of vehicles with a fuselage, wing and tail in ground effect / Lee Juhee // Ocean Engineering. – 2018. – №168. – pp.12–22.
Mohammadhossein Nirooei. Aerodynamic and static stability characteristics of airfoils in extreme ground effect / Nirooei Mohammadhossein // Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering – 2018. – Vol. 232(6). – pp. 1134–1148.
Dongli Ma. Sea-unammned aerial vehicle takeoff characteristics analysis method based on approximate equilibrium hypothesis / Dongli Ma, Zhi Li, Muqing Yang, Yang Guo, Haode Hu. // Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering – 2018. – Vol. 232(6). – pp.1–12.
Xuan Zhang. Computation of Flow Field of an Airfoil with Gurney Flap in Ground Effect / Xuan Zhang, Qiulin Qu, Ramesh K. Agarwal // 35th AIAA Applied Aerodynamics Conference. – 2017. – doi:10.2514/6.2017-4466.
Блохин В.Н. Применение методов вычислительного эксперимента для определения аэродинамических характеристик экраноплана на крейсерском режиме движения / В.Н. Блохин, В.М. Прохоров, П.С. Кальясов, А.К. Якимов, А.В. Туманин, В.В. Шабаров // Вестник Нижегородского университета им. Н.И. Лобачевского. – 2012. – № 3(1). – c. 147–154.
Лобачев М.П. Сравнительный анализ двух подходов к разработке аэрогидродинамической компоновки скоростного амфибийного судна / М.П. Лобачев, П.С. Кальясов, А.И. Лукьянов, А.В. Февральских, В.В. Шабаров // Морской вестник. – 2017. – №3(63). – с. 22–27.
Copyright (c) 2020 Russian journal of water transport
This work is licensed under a Creative Commons Attribution 4.0 International License.
