Parametric investigation of hull shaped fuselage for amphibious UAV

Download
2017
Sazak, Emre
Performance of amphibious unmanned aerial vehicles (UAV’s) that take off from and land on water, like seaplanes, greatly depend on hydrodynamic effects as well as aerodynamic effects, therefore their geometries need to be optimized for both. This study mainly investigates the effect of geometric parameters of a generic, hull-shaped fuselage that are constrained by hydrodynamic drivers, such as the step height needed to reduce hydrodynamic drag, sternpost angle and deadrise angle needed for safe landing; on aerodynamic drag of the fuselage under cruise conditions by using the commercial CFD (Computational Fluid Dynamics) code ANSYS Fluent. Study includes a comparison of the experimental results obtained from literature with numerical results around a hull-shaped fuselage at angles of attack varying between -8° to 16°. 

Suggestions

Parametric investigation of hull shaped fuselage for an amphibious UAV
Sazak, Emre; Kurtuluş, Dilek Funda (null; 2016-07-15)
Performance of amphibious UAV’s (Unmanned Aerial Vehicles) that take off from and land on water, like seaplanes, greatly depend on hydrodynamic effects as well as aerodynamic effects, therefore their geometries need to be optimized. This study mainly investigates the effect of geometric parameters of a generic, hull-shaped fuselage that are constrained by hydrodynamic drivers, such as the step height needed to reduce hydrodynamic drag, and deadrise and sternpost angles needed for safe landing, on aerodynami...
Three dimensional reacting flow analysis of a cavity-based scramjet combustor
Rouzbar, Ramin; Eyi, Sinan; Department of Aerospace Engineering (2016)
Scramjet engines have become one of the main interest areas of the supersonic propulsion systems. Scramjets are rather a new technology and they possess unsolved issues and problems regarding their operation, especially in the combustion process. Combustion at high speeds cause various problems as flame instability and poor fuel-air mixing efficiency. One of the methods used to overcome these problems is to recess cavity in the combustor wall where secondary flow is generated. In this study, a CFD tool is d...
Investigation of the flexible missile fins under aerothermal loadings
Özkökdemir, Emir; Kurtuluş, Dilek Funda; Department of Aerospace Engineering (2018)
Wings or fins on the body flying at the supersonic speed are subjected to the aerothermal loading. These loads are categorized into two main groups; aerodynamic pressure and aerodynamic heating. They affect the strength of wings. In this thesis study, a flexible NACA 65-009 wing of a missile flying at supersonic speed is investigated. It is studied to define the effect of the change in wing geometry by the external loads on the flow characteristics. The flow simulations are carried on Ansys Fluent that uses...
Effect of thickness-to-chord ratio on flow structure of a low swept delta wing
Gülsaçan, Burak; Yavuz, Mehmet Metin; Department of Mechanical Engineering (2017)
Low swept delta wings, which are the simplified planforms of Unmanned Air Vehicles (UAVs), Unmanned Combat Air Vehicles (UCAVs) and Micro Air Vehicles (MAVs), have drawn considerable attention in recent years. In order to characterize and improve the operational parameters of these vehicles, the flow physics over low swept delta wings and its control should be well understood. In literature, the effect of thickness-to-chord ratio (t/C) on aerodynamic performance of a delta wing was studied on high and moder...
Effect of blowing pattern through leading edge on flow structure of 45 degree swept delta wing
Günacar, Gökay; Yavuz, Mehmet Metin; Department of Mechanical Engineering (2016)
There has been an increasing interest in recent years in control of flow structure over non-slender delta wings, which are the simplified planforms of Unmanned Air Vehicles (UAV), Unmanned Combat Air Vehicles (UCAV), and Micro Air Vehicles (MAV). Different control approaches have been applied to alter the flow structure with particular interests in preventing stall and delaying vortex breakdown. Among different flow control techniques, blowing through leading edge of the wing has been commonly used due to i...
Citation Formats
E. Sazak, “Parametric investigation of hull shaped fuselage for amphibious UAV,” M.S. - Master of Science, Middle East Technical University, 2017.