Publication: Recuperación energética de los gases de escape en un motor diésel mediante tecnología turbocompound
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2015-06
Defense date
2015-07-03
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Abstract
En el presente trabajo se analiza la energía procedente de los gases de escape que se
puede aprovechar en un motor turbo diésel.
El análisis parte de un motor diésel atmosférico al que se le instalará el sistema de
turbo-compresor dimensionándolo con el objetivo de conseguir el máximo
rendimiento, y por tanto potencia y par, en el mayor rango de revoluciones posibles.
El sistema de turbo-compresor servirá para poder utilizar luego el sistema de
turbocompound, ya que sin este sistema, la energía que se extrae de los gases de
escape es prácticamente la misma que pierde el motor al forzarle a tener una presión
de escape mayor.
La turbina del turbo-compresor se elegirá de geometría variable, con el fin de que
produzca la máxima potencia posible, pero con el menor gasto másico de aire que se
pueda.
El flujo másico total de escape se divide en dos, por un lado el que pasa por la turbina
del sistema del turbocompresor y por otro lado a una segunda turbina que es la que
aporta energía extra que se puede utilizar para diferentes aplicaciones. La energía que
se consigue en esta turbina es mayor cuantas más altas son las revoluciones del motor.
El reducido gasto másico de la turbina del turbo-compresor, provoca que la energía
generada por la segunda turbina sea la mayor que se puede conseguir.
Esta forma de turbocompound no penaliza de ninguna manera las prestaciones del
motor y toda la energía que se consigue se puede considerar beneficio.
In this paper the energy from the exhaust gases which can be used in turbo diesel engine is analyzed. The analysis starts with an atmospheric diesel engine that will install the system of a turbo-compressor in order to achieve maximum performance, and thus power and torque in the widest range of possible revolutions. The turbocharger system will let use the turbocompound system, because without this system, the energy extracted from the exhaust gases is virtually the same as the engine loses when it been force to have a higher exhaust pressure. The turbine of the turbo-compressor is chosen with variable geometry in order to produce the maximum possible power, but with the lower air mass flow as possible. Total exhaust mass flow is divided into two, first passing through the turbine of the turbocharger system and secondly to a second turbine which is what gives the extra energy that can be used for different applications. The energy obtained in this turbine is higher at the time the engine speed increases. The low mass flow of the turbine of the turbo-compressor, causes that the energy generated by the second turbine is the highest it could be. This form of turbocompound not penalized in any way the performance of the engine and all the energy that is achieved can be considered profit.
In this paper the energy from the exhaust gases which can be used in turbo diesel engine is analyzed. The analysis starts with an atmospheric diesel engine that will install the system of a turbo-compressor in order to achieve maximum performance, and thus power and torque in the widest range of possible revolutions. The turbocharger system will let use the turbocompound system, because without this system, the energy extracted from the exhaust gases is virtually the same as the engine loses when it been force to have a higher exhaust pressure. The turbine of the turbo-compressor is chosen with variable geometry in order to produce the maximum possible power, but with the lower air mass flow as possible. Total exhaust mass flow is divided into two, first passing through the turbine of the turbocharger system and secondly to a second turbine which is what gives the extra energy that can be used for different applications. The energy obtained in this turbine is higher at the time the engine speed increases. The low mass flow of the turbine of the turbo-compressor, causes that the energy generated by the second turbine is the highest it could be. This form of turbocompound not penalized in any way the performance of the engine and all the energy that is achieved can be considered profit.
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Keywords
Motores de combustión interna, Motores Diésel, Turbocompound, Tecnología automovilística