Examinando por Autor "Rodríguez Gutiérrez, Daniela Alejandra"
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- ÍtemDiseño conceptual y preliminar de un tubo de choque supersónico(Fundación Universitaria Los Libertadores. Sede Bogotá., ) Rodríguez Gutiérrez, Daniela Alejandra; Rivera Lozano, Gineth Valeria; Rodríguez Barón, Iván FelipeTo carry out aerodynamic investigations involving high speeds and temperatures, crash tunnels have been used, which are experimental ground test facilities. For this project, the preliminary and conceptual design of a supersonic shock tube will be developed, which represents the flow entrance to the shock tunnel, approximating the extreme conditions encountered during the re-entry of a space vehicle into the Earth's atmosphere at supersonic flight speeds, that is, it provides high enthalpy fluxes. Initially, a shock tube is divided into two sections: Driver (high pressure) and Driven (low pressure), separated by a thin diaphragm that maintains a different pressure in each section, when it breaks, a wave is generated normal shock due to compression waves merging. Subsequently, that normal shock wave propagates towards the low pressure section until it reaches the end wall of the tube and is reflected, while the expansion wave travels towards the high pressure section. From the equations established in supersonic aerodynamics for normal and oblique shock waves, the flow conditions in the shock tube and at its outlet can be determined to carry out studies in the other sections of the tunnel. This investigation is based on the assumption of a calorically perfect gas (stable enthalpy), for which the properties after the normal shock wave are functions only dependent on the shock Mach number and the initial properties defined at sea level. Additionally, it is necessary to determine the dimensions of the tube and its respective couplings, taking into account the standardization of parts (COTS materials) and the theory for thin-walled pressure vessels. Then, CAD modeling is carried out using SolidEdge software with the estimated dimensions and considering the parameters established by ergonomics at work for the operation of the tube. Finally, a 2D simulation is carried out in the Ansys software in order to observe the behavior of the flow through four different contours corresponding to pressure, temperature, density and speed.