Jet Stream
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. 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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2. The Effects of Spoilers on Jet Mixing of Lobed Nozzles
ABSTRACT In this study, spoilers were installed on the lobed nozzle principal model. Keeping axial position unchanged, the different widths of spoilers were mounted along the circumferential direction of a mixer tube. The effects of spoilers on the jet mixing of lobed nozzle were investigated by numerical method, and the results showed that, before or after
J. Aerosp. Technol. Manag.. Publicado em: 2016-12
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3. The Effects of Scalloping Width and Position on Jet Mixing of Lobed Nozzles
ABSTRACT: A series of geometric models of lobed nozzles with a central plug was created by different scalloping positions and widths. The shapes of lower and upper edges, cutting depth were kept unchanged. In this study, by the use of numerical simulation, the effects of scalloped width and position on the performance of jet mixing in the pumping condition w
J. Aerosp. Technol. Manag.. Publicado em: 2015-12
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4. Potenciais influências de anomalias positivas e negativas na camada de gelo marinho no mar de Ross na circulação atmosférica do Hemisfério Sul / Potential influences on the southern hemisphere atmospheric circulation of negative and positive sea ice extension anomalies in the ross sea
This study have used the CPTEC/INPE AGCM to explore the role of sea ice extent in the Ross Sea as a forcing of the asymmetric atmospheric circulation in the southern hemisphere during the austral winter (July-September), on a seasonal scale. The impacts have been assessed from the standpoint of positive and negative observed anomalies in ice extent in the Ro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2011
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5. Análises das características sinóticas das trajetórias dos ciclones extratropicais que atuam na América do Sul e vizinhanças / Synoptic characteristics analysis of extratropical cyclonic tracks which act in South America and its neighborhoods
Com o intuito de aprimorar o conhecimento observacional dos ciclones extratropicais que atuam no sul da América do Sul e nos oceanos adjacentes, o presente trabalho analisa as trajetórias dos mesmos utilizando o algorítimo \textit{track}, uma análise objetiva que permite uma visão mais detalhada da avaliação desses sistemas de tempo. Especificamente,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2010
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6. Upper tropospheric cyclonic vortex and Brazilian Northeast jet stream in El Niño and La Niña years. / Vórtice ciclônico em altos níveis e corrente de jato do nordeste brasileiro em anos de El Niño e La Niña.
A ligação entre Vórtice Ciclônico em Altos Níveis (VCAN) e a Corrente de Jato do Nordeste Brasileiro (CJNEB), foi analisada durante 9 anos entre 1988-2000, divididos em períodos de El Niño, La Niña e Neutro. Através dos produtos de reanálise do NCEP, e imagens do satélite METEOSAT no canal infravermelho, foram observados 167 VCANs, em grande maior
Publicado em: 2010
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7. Aeroacoustics of dual-stream jets with application to turbofan engines.
A Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley s Equations, following the traditional MGBK method from NASA Lang
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/06/2009
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8. CFD and CAA analysis of single stream isothermal jets with noise suppression devices.
Since the 50 s, with the appearance of the turbojet engines, the jet noise is being exhaustively studied, because it is one of the most important source of aircraft noise. Many attempts have been made to reduce the jet noise, including higher by-pass turbofan engines. Chevron nozzles also have been used by the industry to try to reduce the jet noise with a l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2009
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9. Aeroacoustics of dual-stream jets with application to turbofan engines.
A Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley s Equations, following the traditional MGBK method from NASA Lang
Publicado em: 2009
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10. Padrões sinóticos de circulação atmosférica associados ao jato em baixos níveis a leste da Cordilheira ds Andes, na América do Sul / Atmospheric circulation patterns associated with the south america low level jet at east of the Andes
The objective of this studywas toidentify the atmospheric patterns circulationassociated with the South American Low-level Jet (LLJ). The zonal (u) and meridional (v) wind, geopotential height (f), temperature (T), specific humidity (q) and other variables from National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2006
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11. Performance of a Venturi scrubber in the removal of fine powder from a confined gas stream
Experimental results on the performance of a laboratory scale rectangular Venturi scrubber in the removal of fine mineral particles from a confined air stream are presented, and a new correlation is proposed and evaluated. The scrubber was operated with air velocities in the throat varying from 58 m/s to 75 m/s and liquid flow rates varying from 280 ml/min t
Materials Research. Publicado em: 2005-06
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12. Observational study of the low-level jet at the metropolitan region of Porto Alegre during the period 1989 to 2003. / Estudo observacional de jatos de baixos níveis na região metropolitana de Porto Alegre durante o período de 1989 a 2003
To analyze the occurrences of the Low-Level Jets (LLJ) at the metropolitan region of Porto Alegre, fifteen years of collected data of sounding between 00 and 12UTC in the period 1989 to 2003. For this, the criteria of classification proposed by Bonner (1968) and modified by Whiteman et al. (1997) have been applied. After being selected these LLJ were divided
Publicado em: 2005