Gas Turbines
Mostrando 13-24 de 36 artigos, teses e dissertações.
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13. TRANSIENT MODELLING OF INDUSTRIAL GAS TURBINE FOR POWER GENERATION / MODELAGEM DO REGIME TRANSITÓRIO DE TURBINAS A GÁS INDUSTRIAIS PARA A GERAÇÃO DE ENERGIA ELÉTRICA
Gas turbine engines are a vital part of today¿s industry, providing both work and heat for several industry sectors, from transportation to cogeneration systems. The growing need for reliable electricity has encouraged the design of stationary gas turbines, including in Brazil, which operates on multiple fuels such as diesel, natural gas and low calorific f
Publicado em: 2010
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14. Preliminary design methodology for multi fuel gas turbine combustors.
The combustors for gas turbines have been traditionally designed through trial and error, which is a time consuming and expensive process. With the development of computers and new simulation techniques the design process has been improved considerably. However, the design of combustors for gas turbines still remains an iterative process, which requires a br
Publicado em: 2010
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15. Modelagem e controle de microturbina a gás do tipo split-shaft. / Modeling and control of slip-shaft gas microturbine.
The objective of the present work is the development of the model of a split-shaft micro gas turbine with feed back control system. A bibliographical review of the works on control of gas turbines indicated that there are very few works dealing this type of gas turbines. The model was developed starting from the basic geometry of the turbine and applying the
Publicado em: 2010
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16. HYBRID SYSTEM USING GAS TURBINE AND FUEL CELL FOR AERONAUTICAL APU APPLICATION
Much effort and resources are being directed to reduce emissions in the most varied sectors. Today, aviation accounts for less than 5% of human related CO2 emissions, but projections for 2050 indicate that the growth of aviation emissions risks undermining the mitigation progress achieved in other sectors. In aeronautics, increasing fuel efficiency is consid
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200904
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17. Three-dimensional flow calculations of axial compressors and turbines using CFD techniques.
With the advent of powerful computer hardware, Computational Fluid Dynamics (CFD) has been vastly used by researches and scientists to investigate flow behavior and its properties. The cost of CFD simulation is very small compared to the experimental arsenal as test facilities and wind-tunnels. In the last years many CFD commercial packages were developed an
Publicado em: 2009
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18. RemoÃÃo de Ãcidos naftÃnicos presentes na mistura modelo de querosene de aviaÃÃo utilizando adsorventes tipo perovsquitas modificadas
In this work were prepared adsorbents of type perovsquitas La1-xMgxNiO3, where x = 0, 0.25, 0.5, 0.75, 1.0. The addition of magnesium resulted in increased basicity of the material and consequently the affinity of the acids. The adsorbents prepared materials were characterized by atomic absorption espectrofometria (AA), X-ray diffraction (XRD) measurement of
Publicado em: 2009
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19. Fuel cell to biomass gas : modelling of systems and comparison with gas turbines / Celulas a combustivel a gas de biomassa : modelagem de sistemas e comparação com turbinas a gas
O objetivo desse trabalho foi a modelagem de sistemas de células a combustível (CaCs) operando com o gás de gaseificação de biomassa. Dois tipos de CaCs foram consideradas no estudo: a PEMFC (Proton Exchange Membrane Fuel Cell) e a SOFC (Solide Oxide Fuel Cell). A primeira opera com hidrogênio de alta pureza e a concentração permissível de monóxido
Publicado em: 2007
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20. DESENVOLVIMENTO DE UMA METODOLOGIA PARA A CALIBRAÇÃO DE UMA TURBINA UTILIZADA PARA MEDIÇÃO DO VOLUME DESLOCADO DE AR E DETERMINAÇÃO DA SUA INCERTEZA DE MEDIÇÃO / DEVELOPMENT OF A METHODOLOGY FOR CALIBRATING A TURBINE METER USED FOR MEASURING THE DISPLACED AIR VOLUME AND DETERMINATION OF ITS UNCERTAINTY OF MEASUREMENT
Tendo em vista que as normas existentes não apresentam uma metodologia em relação à calibração de medidores tipo turbina e a determinação da incerteza de medição do volume deslocado de gases neste medidor, este trabalho apresenta uma metodologia para sistematizar os processos de calibração. Para isso, foi utilizado uma bancada de calibração com
Publicado em: 2007
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21. Theoretical and experimental study of the effects of scale-up on mixing time for a stirred-tank bioreactor
Mixing time is one of the criteria most widely used to characterize mixing intensity in bioprocesses. In bioreactors, mixing mainly depends on amount of energy consumed, reactor and stirrer shapes, airing speed and the rheology of the medium. In this work we experimentally determined the mixing times for a lab-scale bioreactor equipped with a stirrer propell
Brazilian Journal of Chemical Engineering. Publicado em: 2006-03
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22. Analysis of availability for gas turbines used in thermoelectrical power plant. / Análise de disponibilidade de turbinas a gás empregadas em usinas termelétricas a ciclo combinado.
As usinas termelétricas a ciclo combinado empregadas na geração de energia elétrica são compostas basicamente por três elementos ou sistemas: a Turbina a Gás, a Caldeira de Recuperação e a Turbina a Vapor. A Turbina a Gás é responsável pela transformação da energia química do combustível em energia mecânica para acionar os geradores, e os ga
Publicado em: 2006
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23. Model predictive control for Francis hydro turbine generators / Controle preditivo baseado em modelo para turbo-geradores hidraulicos tipo Francis
Despite being used in the industry for more than 20 years, Model Predictive Control (MPC) has not found many applications in the field of rotating machinery controI. The majority of the applications today are chemical and petrochemical processes. However, some results obtained by other authors for the control of gas and steam turbines, suggest that its use c
Publicado em: 2006
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24. Cogeração usando gases de escapamento de motores diesel sobrealimentados, potencialidades, impactados / Cogeneration by using discharge gases in diesel engines turbocharged, potentialities and impacts
Cogeneration is a broadly used tool to improve the performance of thermal systems by using combined cycles. In this sense, it is aimed to identify the amount of spare energy found in the turbine used to perform extra power in engines equipped either with waste-gate or twin flow. In this way, refrigerating power is used motor vehicle applications. For this pu
Publicado em: 2006