Hypersonic
Mostrando 1-12 de 34 artigos, teses e dissertações.
-
1. Aerothermodynamic Optimization of Aerospace Plane Airfoil Leading Edge
ABSTRACT: Aiming to mitigate the aerodynamic heating during hypersonic re-entry, the aerothermodynamic optimization of aerospace plane airfoil leading edge is conducted. Lift-to-drag ratio at landing condition is taken as a constraint to ensure the landing aerodynamic performance. First, airfoil profile is parametrically described to be more advantageous dur
J. Aerosp. Technol. Manag.. Publicado em: 02/10/2017
-
2. Configuration Study of Structurally Integrated Thermal Protection Systems for a Sub-Orbital Platform
ABSTRACT: The atmospheric hypersonic flight of sub-orbital and space vehicles generates aerodynamic heating and high wall heat fluxes, inducing high temperatures on the vehicle's structures and affecting their mechanical behavior, besides degrading the operation of board equipment. Furthermore, since payload preservation is always mandatory, the use of effic
J. Aerosp. Technol. Manag.. Publicado em: 2015-06
-
3. Niobium and niobium-iron coatings on API 5LX 70 steel applied with HVOF
The present study aimed to create and characterize niobium and niobium-iron 60% coatings applied to steel API 5L X70 using the hypersonic thermal spray process (HVOF). The morphologies of the coatings were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and profilometry, while the coatings' har
Mat. Res.. Publicado em: 27/06/2014
-
4. A Numerical Investigation of Localized and Steady Energy Addition to High Speed Airflows
ABSTRACT This work presents a numerical analysis of the gas dynamic problem of localized and steady energy addition to uniform high-speed airflows. Firstly, the general effects caused by a localized energy deposition on the flow were investigated, then an extensive parametric analysis concerning the effects of energy deposition rate and dispersion for differ
J. Aerosp. Technol. Manag.. Publicado em: 2013-06
-
5. Calculation of The Vehicle Drag and Heating Reduction at Hypervelocities with Laser-Induced Air Spike
ABSTRACT: Scientists at the laboratory of Força Aérea Brasileira (FAB) have demonstrated experimentally that laser-induced "air spikes" (DEAS) may reduce effectively both total vehicle drag and heating at hypervelocities. Now, we apply the Rayleigh flow to directly determine the degree of reduction in vehicle drag and convective heat flux into the airframe
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
-
6. A study on the extension of an upwind parallel solver for turbulent flow applications
The present work is primarily concerned with studying the influence of an upwind spatial discretization on the capability of representing turbulent flows on aerospace applications, in the context of a flow simulation code that is fairly close to a production code. Therefore, the work addresses the issues of implementing and validating an advanced turbulence
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/02/2012
-
7. An edge-based unstructured mesh formulation for high speed tridimensional compressible flow simulation
Numerical simulation of realistic compressible flows is very important and requires accurate and flexible tridimensional formulations, which should furthermore be robust and efficient. In this work we describe the development of a computational tool for numerical simulation of inviscid compressible 3-D fluid flow problems. This tool uses as the main building
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
-
8. Experimental results of a Mach 10 conical-flow derived waverider to 14-X hypersonic aerospace vehicle
Abstract This paper presents a research in the development of the 14-X hypersonic airspace vehicle at Institute for Advanced Studies (IEAv) from Department of Science and Aerospace Technology (DCTA) of the Brazilian Air Force (FAB). The 14-X project objective is to develop a higher efficient satellite launch alternative, using a Supersonic Combustion Ramjet
J. Aerosp. Technol. Manag.. Publicado em: 2011-08
-
9. A new particle-like method for high-speed flows with chemical non-equilibrium
Abstract: The present work is concerned with the numerical simulation of hypersonic blunt body flows with chemical non-equilibrium. New theoretical and numerical formulations for coupling the chemical reaction to the fluid dynamics are presented and validated. The fluid dynamics is defined for a stationary unstructured mesh and the chemical reaction process
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
-
10. Degradation of carbon-based materials under ablative conditions produced by a high enthalpy plasma jet
Abstract: A stationary experiment was performed to study the degradation of carbon-based materials by immersion in a plasma jet. In the experiment, graphite and C/C composite were chosen as the target materials, and the reactive plasma jet was generated by an air plasma torch. For macroscopic study of the material degradation, the sample's mass losses were m
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
-
11. Numerical investigation of aerothermodynamic in a reentry vehicle with surface discontinuity-like cavity / Investigação numérica da aerotermodinâmica de veículos na reentrada com imperfeições na superficie do tipo cavidade
In the design of hypersonic vehicles, the knowledge of factors that affects the thermal and aerodynamic loads acting on the vehicle surface becomes imperative. Usually, in the thermal load calculations, the analysis assumes that the vehicle has a smooth surface. However, discontinuities or imperfections are present on the surface of reentry vehicles. In this
Publicado em: 2010
-
12. An assessment of unstructured grid finite volume schemes for cold gas hypersonic flow calculations
Abstract: A comparison of five different spatial discretization schemes is performed considering a typical high speed flow application. Flowfields are simulated using the 2-D Euler equations, discretized in a cell-centered finite volume procedure on unstructured triangular meshes. The algorithms studied include a central difference-type scheme, and 1st- and
J. Aerosp. Technol. Manag.. Publicado em: 2009-12