12 documents found, page 1 of 2
Montagem e testes de uma bancada para medição de desempenho de aerogeradores em...
Rocha, Paulo Alexandre Costa; Carneiro, Francisco Olimpio Moura; Lopes, Alberto dos Santos; Maia, Igor Albuquerque; Modolo, Angelo BezerraThe present article consists in the development of a new bench to measure the power curves of different wind turbine blades. The components were built and tested to assure adequate measurements and secure operation. The bench was used in the Wind Energy class of the Mechanical Engineering undergraduate and graduate programs. It allows the measurements of the power curves of different wind turbine blades. Using ...
Development, validation and application of a newly developed rig facility for i...
Bastos, Leopoldo Pacheco; Deschamps, César José; Silva, Andrey Ricardo da; Cordioli, Julio Apolinário; Sirotto, José Rodrigues de Lima NetoOver the last decades, significant improvements have been achieved in terms of noise reduction for jet engine aircraft. Nevertheless, jet noise remains one of the major sound sources from commercial aircraft, particularly during take-off. To develop strategies for jet noise reduction, it becomes paramount to understand the mechanisms of sound production and radiation from the experimental point of view. For thi...
Performance analysis of typical airfoils through numerical simulation using flu...
Maia, Igor AlbuquerqueThe lift and drag coefficients curves as a function of the angle of attack for typical airfoils were obtained through computer simulation of the fluid-structure interaction. The airfoil was modeled as a section of a 1m chord infinite wing, and the simulation domain was modeled as a wind tunnel with 13m length and 1m width. The finite element used was a 2-D beam element which allows rotation and linear displacem...
Two-point wavepacket modelling of jet noise
Maia, Igor Albuquerque; Jordan, Peter; Cavalieri, André Valdetaro Gomes; Jaunet, VincentThis paper is focused on the study of a kinematic wavepacket model for jet noise based on two-point statistics. The model contains physical parameters that define its structure in terms of wavenumber, envelope shape and coherence decay. These parameters, which are necessary to estimate the sound pressure levels radiated by the source, were educed from a large-eddy simulation database of a Mach 0.4, fully turbul...
Wavepacket Modelling of Broadband Shock-Associated Noise in Supersonic Jets
Wong, Marcus H.; Jordan, Peter; Maia, Igor Albuquerque; Cavalieri, André Valdetaro Gomes; Kirby, Rhiannon; Fava, Thales Coelho LeiteWe present a two-point model to investigate the underlying source mechanisms for broadband shock-associated noise (BBSAN) in shock-containing supersonic jets. In the model presented, the generation of BBSAN is assumed to arise from the nonlinear interac- tion between downstream-propagating coherent structures with the quasi-periodic shock cells in the jet plume. The turbulent perturbations are represented as ax...
Experimental investigation of turbulent flow field associated with round and ch...
Maia, Igor Albuquerque; Froening, Lígia Venancio; Deschamps, César José; Salazar, Juan Pablo de Lima CostaThe turbulent jet is one the main sources of noise in aircrafts. In spite of decades of research, this problem remains a challenging topic in aeroacoustics while the mechanisms of sound generation are not yet fully understood. Modelling of the generation and propagation of sound in a jet generally requires knowledge of turbulence statistics that are not trivially measured, in addition to the mean-velocity field...
Closed-loop control of forced turbulent jets
Maia, Igor Albuquerque; Jordan, Peter; Cavalieri, André Valdetaro Gomes; Silva, Eduardo Martini Rodrigues da; Silvestre, Flávio JoséClosed-loop control of turbulent flows is a challenging problem with important practical and fundamental implications. We perform closed-loop control of forced, turbulent jets based on a wave-cancellation strategy. The study is motivated by the success of recent studies in applying wave cancellation to control instability waves in transitional boundary layers and free-shear flows. Using a control law obtained t...
Caracterização Experimental do Efeito de um Bocal com Chevron sobre o Campo Tur...
Maia, Igor AlbuquerqueThe turbulent jet issuing from engine exhaustion is one of the main sources of noise in an aircraft. This is a topic in the research field of aeroacoustics in which the sound generation mechanisms are not yet fully understood. However, some noise reduction devices have been developed and applied in aircrafts, such as tabs and chevrons. The present work addresses a comparison between the flow fields generated by...
Coupling aerodynamic loading to structural analysis of wind turbines through nu...
Maia, Igor Albuquerque; Silva Júnior, Francisco Ilson da; Rocha, Paulo Alexandre Costa; Carneiro, Francisco Olimpio MouraStructural analysis of wind turbine blades is essential to design the other components of the turbine. In this context, the study of the loads imposed by the wind is necessary, since the choice of aerodynamic factors is determined by structural constraints. This work was carried out aiming to study the fluid-structure interaction in a micro-scale wind turbine through computational simulation, in order to obtain...
Experimental Characterization Of The Effect Of A Chevron Nozzle On The Turbulen...
Maia, Igor Albuquerque; Deschamps, César José; Salazar, Juan Pablo de Lima CostaThe turbulent jet issuing from engine exhaustion is one of the main sources of noise in an aircraft. This is a topic in the research field of aeroacoustics in which the sound generation mechanisms are not yet fully understood. However, some noise reduction devices have been developed and applied in aircrafts, such as tabs and chevrons. The present work addresses a comparison between the flow fields generated by...