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Browsing by UPV Unit "Universitat Politècnica de València. Departamento de Máquinas y Motores Térmicos - Departament de Màquines i Motors Tèrmics"

Now showing items 1-20 of 776

A bias correction method for fast fuel-to-air ratio estimation in diesel engines

Guardiola, Carlos; Plá Moreno, Benjamín; Blanco-Rodriguez, David; Mazer, Alexandre; Hayat, Olivier (SAGE Publications (UK and US), 2013-08)

l probes in turbocharged diesel engines are usually located downstream of the turbine, exhibiting a good dynamic response but a significant delay because of the exhaust line transport and the hardware itself. With the ...
A CFD STUDY OF CAVITATION IN REAL SIZE DIESEL INJECTORS

Patouna, Stavroula (2012-02-17)

In Diesel engines, the internal flow characteristics in the fuel injection nozzles, such as the turbulence level and distribution, the cavitation pattern and the velocity profile affect significantly the air-fuel mixture ...
A Challenging Future for the IC Engine: New Technologies and the Control Role

F. Payri; Luján, José M.; Guardiola, Carlos; Plá Moreno, Benjamín (EDP Sciences, 2015)

[FR] Un challenge pour le futur du moteur a` combustion interne : nouvelles technologies et ro¿le du contro¿le moteur ¿ Les nouvelles normes sur les e¿missions, en particulier le CO2, pourraient re¿duire l¿utilisation ...
A Combination of Swirl Ratio and Injection Strategy to Increase Engine Efficiency

Olmeda, P.; Martín, J.; García Martínez, Antonio; Villalta-Lara, David; Warey, Alok; Domenech Llopis, Vicente (SAE International, 2017)

[EN] Growing awareness about CO2 emissions and their environmental implications are leading to an increase in the importance of thermal efficiency as criteria to design internal combustion engines (ICE). Heat transfer to ...
A combined 1D3D CFD approach for reducing mesh dependency in Diesel spray calculations

García-Oliver, José M; Margot , Xandra; Chávez Cobo, Mariany de Jesús; Karlsson, A (PERGAMON-ELSEVIER SCIENCE LTD, 2011)

[EN] A 1D3D-CFD coupled spray model is proposed in this work for the simulation of Diesel sprays under non-evaporative conditions and constant injection velocity in time. The basic idea of the model is to reduce the poor ...
A complete 0D thermodynamic predictive model for direct injection diesel engines

Payri González, Francisco; Olmeda, P.; Martín Díaz, Jaime; García Martínez, Antonio (Elsevier, 2011-06-01)

[EN] Ideal models provide the simplest way to reproduce internal combustion engine (ICE) cycles, but they usually do not represent with sufficient accuracy the actual behaviour of an ICE. A suitable alternative for research ...
A comprehensive methodology to analyse the Global Energy Balance in Reciprocating Internal Combustion Engines

Carreño Arango, Ricardo (2016-11-02)

[EN] The main objective of this doctoral thesis is the development of a comprehensive methodology to perform and analyse the thermal balance of reciprocating engines, based on experimental and theoretical techniques. ...
A Comprehensive Study of Particle Size Distributions with the Use of PostInjection Strategies in DI Diesel Engines

Desantes, J.M.; Bermúdez, Vicente; García Martínez, Antonio; Linares Rodríguez, Waldemar Gregorio (Taylor & Francis, 2011)

[EN] Control strategies such as variations in injection pressure and timing have been used by researchers to reduce in-cylinder exhaust emissions and meet legislation standards. Postinjection has been studied for several ...
A computational fluid dynamics analysis of vorticity redution for turbocharged internal combustion engines

Wilczynski, Daniel (2017-09-26)

El trabajo consiste en la utilización de la mecánica de fluidos computacional (CFD) para el análisis, diseño y optimización de sistemas de atenuación de la vorticidad (swirl) para su instalación en instalaciones de ensayo ...
A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

Molina, Santiago; Salvador Rubio, Francisco Javier; Carreres Talens, Marcos; Jaramillo, D. (Elsevier, 2014-03)

In this paper a computational study was carried out in order to investigate the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development. With this aim, a large number of injection ...
A computationally efficient Kalman filter based estimator for updating look-up tables applied to NOx estimation in diesel engines

Guardiola, Carlos; Plá Moreno, Benjamín; Blanco-Rodriguez, David; Eriksson, L. (International Federation of Automatic Control (IFAC), 2013-11)

No-x estimation in diesel engines is an up-to-date problem but still some issues need to be solved. Raw sensor signals are not fast enough for real-time use while control-oriented models suffer from drift and aging. A ...
A contribution to the understanding of cavitation effects in Diesel injector nozzles through a combined experimental and computational investigation

Payri González, Francisco; Payri, Raul; Salvador Rubio, Francisco Javier; Martínez López, Jorge (Elsevier, 2012-04-15)

In this paper a combined experimental and computational study was carried out in order to assess the ability of a homogeneous equilibrium model in predicting the experimental behaviour observed from the hydraulical ...
A direct transform for determining the trapped mass on an internal combustion engine based on the in-cylinder pressure resonance phenomenon

Broatch Jacobi, Jaime Alberto; Guardiola García, Carlos; Plá Moreno, Benjamín; Bares Moreno, Pau (Elsevier, 2015-10)

It has lately been demonstrated that the resonance of the in-cylinder pressure may be used for inferring the trapped mass in an internal combustion engine. The resonance frequency changes over time as the expansion stroke ...
A general model to evaluate mechanical losses and auxiliary energy consumption in reciprocating internal combustion engines

Tormos, B.; Martín, J.; Carreño-Arango, Ricardo; Ramirez-Roa, Leonardo Andrés (Elsevier, 2018)

[EN] The increasingly stringent emissions regulations and the climatic change as consequence of green house gases emissions have moved the research interest towards the optimization of the internal combustion engine. Hence, ...
A kinetic study of the formation of smectic phases in novel liquid crystal ionogens

Martinez-Felipe, Alfonso; Badia, J.D.; Santonja Blasco, Laura; Imrie, C.T.; Ribes Greus, María Desamparados (Elsevier, 2013-06)

[EN] A multi-rate non-isothermal kinetic analysis of the isotropic-melt to liquid crystalline phase transition of novel liquid crystalline ionogenic copolymers, LCIs, the 10-(4-methoxyazobenzene-4'-oxy)decyl methacrylate ...
A large-eddy simulation of diesel-like gas jets

Hoyas, S; Gil, A.; Mompó Laborda, Juan Manuel; Khuong ., Anh Dung (Inderscience, 2011)

[EN] Some aspects of the transient evolution of diesel-like gas jets by means of large-eddy simulation (LES) are discussed in this work. In order to understand the relationship between the inlet boundary condition and the ...
A learning algorithm concept for updating look-up tables for automotive applications

Guardiola García, Carlos; Plá Moreno, Benjamín; Blanco Rodríguez, David; Cabrera López, Pedro (Elsevier, 2013-04)

Look-up tables are commonly used in the automotive field for handling operating point variations. However, constant maps cannot cope with systems variations and ageing. Methods, such as Kalman filter or Extended Kalman ...
A methodology to assess the energetic valorization of bio-based polymers from the packaging industry: pyrolysis of reprocessed polylactide

Badía Valiente, José David; Santonja Blasco, Laura; Martinez-Felipe, Alfonso; Ribes Greus, María Desamparados (Elsevier, 2012-05)

The energetic valorization process of bio-based polymers is addressed in this study, taking polylactide (PLA) as model. The pyrolysis of virgin and multiple-injected PLA was simulated by means of multi-rate linear-non-isothermal ...
A moving mesh generation strategy for solving an injector internal flow problem

Margot, Xandra; Hoyas, S.; Fajardo, Pablo; Patouna, Stavroula (Elsevier, 2010)

[EN] The ability to handle complex geometries is an important part of transient calculations; therefore, the need for fully automatic mesh generation capable of dealing with such geometries is quite demanded. In this paper ...
A new approach to compute temperature in a liquid-gas mixture. Application to study the effect of wall nozzle temperature on a Diesel injector

Payri, Raul; Gimeno, Jaime; Marti-Aldaravi, Pedro; Alarcón-Herrera, Mary Yilbary (Elsevier, 2017)

[EN] Thermal effects on internal combustion engines have been always a hot topic. Its effects also on the injection system are still under research. In this work, a homogeneous model called Eulerian Spray Atomization (ESA) ...