RiuNet UPV Home
:
Browsing by UPV Unit

Search RiuNet

Browse

All of RiuNet

My Account

RiuNet Help

Admin. UPV

Browsing by UPV Unit "Universitat Politècnica de València. Instituto Universitario CMT-Motores Térmicos - Institut Universitari CMT-Motors Tèrmics"

Now showing items 1-20 of 220

A comparison of diesel sprays CFD modeling approaches: DDM versus Sigma-Y Eulerian atomization model

Desantes Fernández, José Mª; García Oliver, José María; Pastor Enguídanos, José Manuel; Pandal-Blanco, Adrián (Begell House, 2016)

[EN] A comparison between the Σ-Y atomization model and a classical DDM approach has been carried out for diesel spray CFD simulations. The Σ-Y model, originally proposed by Vallet and Borghi (1999), is based on an Eulerian ...
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 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 consistent, scalable model for Eulerian spray modeling

Pandal-Blanco, Adrián; Pastor Enguídanos, José Manuel; García Oliver, José María; Baldwin, E.; Schmidt, D.P. (Elsevier, 2016-07)

Despite great practical interest in how sprays emanate from fuel injectors, the near-nozzle region has remained a challenge for spray modelers. Recently, Eulerian models have shown promise in capturing the fast gas-liquid ...
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 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 new methodology for uncertainties characterization in combustion diagnosis and thermodynamic modelling

Benajes Calvo, Jesus Vicente; Olmeda González, Pablo Cesar; Martín Díaz, Jaime; Carreño Arango, Ricardo (Elsevier, 2014-10-05)

Combustion diagnosis based on in-cylinder pressure signals as well as 0D thermodynamic modelling, are widely used to study and optimize the combustion in reciprocating engines. Both approaches share some uncertainties ...
A New Methodology to Evaluate Engine Ignition Systems in High Density Conditions

Payri Marín, Raúl; Novella Rosa, Ricardo; García Martínez, Antonio; Domenech Llopis, Vicente (Society for Experimental Mechanics (SEM), 2014-06)

In this research, a new methodology to evaluate the operation of spark ignition systems in high density conditions is presented. New requirements in engines and new combustion modes demand more from these systems. One of ...
A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Torregrosa, A. J.; Broatch, A.; Olmeda, P.; Cornejo-Luna, Omar (Isfahan University of Technology, 2016-09)

[EN] Current trends in engine design indicate the necessity to take advantage of the highest rates of heat transfer associated with nucleate boiling, mostly at high engine loads. When used in conjunction with advanced ...
A RCCI operational limits assessment in a medium duty compression ignition engine using an adapted compression ratio

Benajes Calvo, Jesus Vicente; Pastor Soriano, José Vicente; García Martínez, Antonio; Boronat-Colomer, Vicente (Elsevier, 2016-10-15)

Reactivity Controlled Compression Ignition concept offers an ultra-low nitrogen oxide and soot emissions with a high thermal efficiency. This work investigates the capabilities of this low temperature combustion concept ...
A sparse mesh for Compact Finite Difference Fourier solvers with radius-dependent spectral resolution in circular domains

Torregrosa, A. J.; Hoyas, S; Gil, A.; García Galache, José Pedro (Elsevier, 2014-04)

This paper presents a new method for the resolution of elliptic and parabolic equations in circular domains. It can be trivially extended to cylindrical domains. The algorithm uses a mixed Fourier-Compact Finite Difference ...
A study on diesel spray tip penetration and radial expansion under reacting conditions

Payri, Raul; García Oliver, José María; Xuan, Tiemin; Bardi, Michele (Elsevier, 2015-11-05)

The shape of Diesel spray was investigated at real engine conditions in a constant pressure combustion chamber. Schlieren imaging technique was used to make quantitative measurements of spray tip penetration and radial ...
A study on the internal convection in small turbochargers. Proposal of heat transfer convective coefficients

Serrano Cruz, José Ramón; Olmeda González, Pablo Cesar; Arnau Martínez, Francisco José; Reyes Belmonte, Miguel Ángel; Tartoussi, Hadi (Elsevier, 2015-10-05)

Nowadays turbochargers play an important role in improving internal combustion engines (ICE) performance. Usually, engine manufacturers use computer codes to predict the behaviour of both engine and turbocharger, the ...
A study on the relationship between internal nozzle geometry and injected mass distribution of eight ECN Spray G nozzles

Matusik, Katarzyna; Duke, Daniel; Sovis, Nicholas; Swantek, Andrew; Powell, Christopher; Payri, Raul; Vaquerizo, Daniel; Giraldo Valderrama, Jhoan Sebastián; Kastengren, Alan (Editorial Universitat Politècnica de València, 2017-07-28)

[EN] Gasoline direct injection (GDI) nozzles are manufactured to meet geometric specifications with length scales on the order of a few hundred microns. The machining tolerances of these nominal dimensions are not always ...
A Technique to Match the Refractive Index of Different Diesel Fuels with the Refractive Index of Transparent Materials to Improve the Experimental Visualization

Payri, Raul; Salvador Rubio, Francisco Javier; Gimeno, Jaime; Venegas Pereira, Óscar Hernando (Springer Verlag (Germany), 2016-02)

In this article a technique to match the refractive index (n) of different diesel fuels with the refractive index of transparent materials is presented with the aim to improve the flow visualization inside transparent ...
A tool for predicting the thermal performance of a diesel engine

Torregrosa, A. J.; Olmeda González, Pablo Cesar; Martín Díaz, Jaime; Romero Piedrahita, Carlos Alberto (Taylor & Francis, 2011)

This paper presents a thermal network model for the simulation of the transient response of diesel engines. The model was adjusted by using experimental data from a completely instrumented engine run under steady-state ...
Acoustic characterization of automotive turbocompressors

Torregrosa, A. J.; Broatch Jacobi, Jaime Alberto; Navarro García, Roberto; García Tíscar, Jorge (SAGE Publications (UK and US), 2015-01)

The performance of different experimental techniques proposed in the literature for acoustic characterization was assessed through the study of the noise generated by the compressor of an automotive turbocharger under ...
Adaptive calibration for reduced fuel consumption and emissions

Guardiola, Carlos; Plá Moreno, Benjamín; Bares-Moreno, Pau; Waschl, Harald (SAGE Publications (UK and US), 2016-12)

This paper presents a model-based approach for continuously adapting an engine calibration to the traffic and changing pollutant emission limits. The proposed strategy does not need additional experimental tests beyond ...
An assessment of the dual-mode reactivity controlled compression ignition/conventional diesel combustion capabilities in a EURO VI medium-duty diesel engine fueled with an intermediate ethanol-gasoline blend and biodiesel

Benajes Calvo, Jesus Vicente; García Martínez, Antonio; Monsalve Serrano, Javier; Balloul, Iyad; Pradel, Gerard (Elsevier, 2016-09-01)

This work investigates the capabilities of the dual-mode reactivity controlled compression ignition/conventional diesel combustion engine operation to cover the full operating range of a EURO VI medium-duty diesel engine ...
An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Desantes Fernández, José Mª; Pastor, José V.; García Oliver, José María; Briceño Sánchez, Francisco Javier (Elsevier, 2014-08)

Schlieren imaging has helped deeply characterize the behavior of Diesel spray when injected into an oxygen-free ambient. However, when considering the transient penetration of the reacting spray after autoignition, i.e. ...