Attack Angle
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Investigation of a NACA0012 Finite Wing Aerodynamics at Low Reynold’s Numbers and 0º to 90º Angle of Attack
ABSTRACT: The aerodynamic characteristics of a NACA0012 wing geometry at low Reynold’s numbers and angle of attack ranging from 0º to 90º are investigated using numerical simulations and the results are validated by wind tunnel experiments. Further experiments are conducted at low Reynold’s numbers of 1 × 105, 2 × 105 and 3 × 105. Findings of the st
J. Aerosp. Technol. Manag.. Publicado em: 28/03/2019
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2. Effects of Bio-Inspired Surface Roughness on a Swept Back Tapered NACA 4412 Wing
ABSTRACT: This paper presents the overall pros and cons of the effect of surface roughness elements over a NACA 4412 tapered, swept back half wing with a sweep angle of 30º and a dihedral angle of 5º. The tests were conducted at a Reynolds number of 4 × 105 in the IIUM Low Speed wind tunnel. Different roughness sizes and roughness locations were tested fo
J. Aerosp. Technol. Manag.. Publicado em: 28/03/2019
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3. Yield loss in sunflower cultivars due to bird attack
RESUMO O ataque de pássaros ao girassol pode dificultar a exploração do girassol no semiárido brasileiro. O objetivo deste trabalho foi avaliar os efeitos de níveis (0, 33, 66 e 100%) de proteção dos capítulos de oito cultivares de girassol, avaliadas em blocos casualizados com parcelas subdivididas e quatro repetições. As cultivares foram aplicada
Rev. Ciênc. Agron.. Publicado em: 2019-03
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4. Improvement of Airfoils Aerodynamic Efficiency by Thermal Camber Phenomenon at Low Reynolds Number
ABSTRACT: In this research, viscous, laminar and steady flow around symmetric and non-symmetric airfoils is simulated at Low Reynolds Number (LRN). Navier-Stokes (N-S) equations are discretized by Finite Volume Method (FVM) and are solved by the SIMPLE algorithm in an open source software, namely OpenFOAM. The main objective of this paper is the introduction
J. Aerosp. Technol. Manag.. Publicado em: 01/11/2018
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5. Computational Investigation on the Effects of Two-Way Wing Morphing Strategy in the Critical Mach Number
ABSTRACT: The elasto-flexible wing morphing is an advanced methodology to achieve higher lift-to-drag (L/D) ratio for the subsonic wing configurations at the given flow conditions. The present article describes mechanisms of continuous morphing of a swept back wing for achieving effective delay in the critical Mach number (Mcr) distribution over the wing sur
J. Aerosp. Technol. Manag.. Publicado em: 08/03/2018
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6. Jaburetox: update on a urease-derived peptide
Abstract Urease from Canavalia ensiformis seeds was the first enzyme ever to be crystallized, in 1926. These proteins, found in plants, bacteria and fungi, present different biological properties including catalytic hydrolysis of urea, and also enzyme-independent activities, such as induction of exocytosis, pro-inflammatory effects, neurotoxicity, antifungal
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 08/02/2018
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7. Aerodynamics of Harmonically Oscillating Aerofoil at Low Reynolds Number
ABSTRACT: Two-dimensional flows over harmonically oscillating symmetrical aerofoil at reduced frequency of 0.1 were investigated for a Reynolds number of 135,000, with focus on the unsteady aerodynamic forces, pressure and vortex dynamics at post-stall angles of attack. Numerical simulations using ANSYS® FLUENT CFD solver, validated by wind tunnel experimen
J. Aerosp. Technol. Manag.. Publicado em: 2017-03
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8. Wind Tunnel Testing on a Generic Model of a Hybrid Lifting Hull
ABSTRACT In this research, an experimental investigation was carried out at the International Islamic University Malaysia - Low Speed Wind Tunnel facility on a generic model of a hybrid lifting hull. Based on the historical trends of non-rigid airships, the fineness ratio of the said hull has been selected equal to 4. Free stream velocity was kept at 20 m/s
J. Aerosp. Technol. Manag.. Publicado em: 2016-12
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9. Numerical Study of Reduced Frequency Effect on Longitudinal Stability Derivatives of Airfoil under Pitching and Plunging Oscillations
ABSTRACT In this study, incompressible, unsteady and turbulent flow over an airfoil with pitching and plunging oscillations is numerically studied in order to investigate the effect of reduced frequency on stability derivatives of oscillating airfoil. Linear k – ε model called Launder-Sharma and Rhie and Chow model are used for turbulence modeling and ove
J. Aerosp. Technol. Manag.. Publicado em: 2016-09
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10. Effect of two wild rootstocks of genus Passiflora L. on the content of antioxidants and fruit quality of yellow passion fruit
ABSTRACT The nutritional importance of the fruit of passionfruit has prompted studies to assess its composition and antioxidant content and to evaluate it as a functional food in fresh fruit and concentrated juice markets. Currently, the use of wild species as rootstock has been recommended mainly for their positive effects such as tolerance to disease attac
Bragantia. Publicado em: 26/02/2016
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11. An Extended Kalman Filter-Based Technique for On-Line Identification of Unmanned Aerial System Parameters
ABSTRACT: The present article deals with the identification, at the same time, of aircraft stability and control parameters taking into account dynamic damping derivatives. Such derivatives, due to the rate of change of the angle of attack, are usually neglected. So the damping characteristics of aircraft dynamics are attributed only on pitch rate derivative
J. Aerosp. Technol. Manag.. Publicado em: 2015-09
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12. On the use of capsaicin as a natural preservative against fungal attack on Pinus sp. and Hymenaea sp. woods
Capsaicin (capsicum oleoresin) extracted from two peeper species, Capsicum frutescens and Capsicum baccatum, was investigated as a natural preservative against fungal (Paecilomyces variotti) attack on Pinus sp. and Hymenaea sp. Static contact angle measurements were performed as a function of time in order to investigate the wetting properties of the wood sa
Mat. Res.. Publicado em: 23/08/2013