ICI - AeroG-LAETA | Documentos por Auto-Depósito
Permanent URI for this collection
Browse
Browsing ICI - AeroG-LAETA | Documentos por Auto-Depósito by Author "Barata, Jorge M. M."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Plunging Airfoil: Reynolds Number and Angle of Attack EffectsPublication . Camacho, E. A. R.; Neves, Fernando M. S. P.; Silva, André; Barata, Jorge M. M.Natural flight has consistently been the wellspring of many creative minds, yet recreating the propulsive systems of natural flyers is quite hard and challenging. Regarding propulsive systems design, biomimetics offers a wide variety of solutions that can be applied at low Reynolds numbers, achieving high performance and maneuverability systems. The main goal of the current work is to computationally investigate the thrust-power intricacies while operating at different Reynolds numbers, reduced frequencies, nondimensional amplitudes, and mean angles of attack of the oscillatory motion of a NACA0012 airfoil. Simulations are performed utilizing a RANS (Reynolds Averaged Navier-Stokes) approach for a Reynolds number between 8.5×10^3 and 3.4×10^4, reduced frequencies within 1 and 5, and Strouhal numbers from 0.1 to 0.4. The influence of the mean angle-of-attack is also studied in the range of 0º to 10º. The outcomes show ideal operational conditions for the diverse Reynolds numbers, and results regarding thrust-power correlations and the influence of the mean angle-of-attack on the aerodynamic coefficients and the propulsive efficiency are widely explored.
- Supercritical Injection Modeling by an Incompressible but Variable Density ApproachPublication . Magalhães, Leandro; Silva, A. R. R.; Barata, Jorge M. M.Supercritical nitrogen jet behavior is modeled using an incompressible but variable density approach developed for variable density jets. Following mechanical and thermal breakup concepts, several injection conditions relevant to liquid rocket propulsion are analyzed, considering heat transfer in the injector. Regarding axial density distributions, different levels of agreement with experimental data are encountered for potential core, subsided core, and plateau formations. Further comparisons with compressible formulations from the literature are a good indicator of the proposed methodology’s suitability for the simulation of supercritical injection behavior.
- The History of Aerospace/Aerospace/Aeronautics Engineering in PortugalPublication . Barata, Jorge M. M.; Neves, Fernando M. S. P.; Silva, AndréIn the present study the origins of the aeronautics engineering education in Portugal are investigated, as well as the relations between the different initiatives that occurred in the beginning of the twentieth century. This paper aims at reporting the most relevant initiatives in Portugal and the actors involved. From 1963 to 1974 the Portuguese Air Force in together with a Portuguese University taught the first Aeronautics Engineering Military Degree at Portugal. In early 1990s two Portuguese Universities and the Portuguese Air Force started their Aerospace/Aeronautics Engineering Degrees teaching. In the 21st Century the Aerospace/Aeronautics Engineering courses at Portugal are connected with the most advanced Engineering Schools in Europe providing skills and competences integrating several disciplines.