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Listar por autor "Payri Marín, Raúl"

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A Comprehensive Modeling Toolchain for Particle Emissions in GDI Engines

Abboud, Rami (Universitat Politècnica de València, 2024-09-02)

[ES] La formación de hollín en los motores de inyección directa de gasolina se rige por complejas interacciones entre procesos físicos, que varían en función del modo de funcionamiento del motor. Con la aplicación de ...
A computational methodology to account for the liquid film thickness evolution in Direct Numerical Simulation of prefilming airblast atomization

Payri, Raul; Salvador, Francisco Javier; Carreres, Marcos; Moreno-Montagud, C. (Elsevier, 2023-04)

[EN] Prefilming airblast atomization is becoming widely used in current aero engines. Fundamental studies on the actual annular configuration of airblast atomizers are difficult to realize. For this reason, researchers ...
A conceptual model of polyoxymethylene dimethyl ether 3 (PODE3) spray combustion under compression ignition engine-like conditions

Xuan, Tiemin; Li, Haojie; Wang, Yutao; Chang, Yachao; Jia, Ming; He, Zhixia; Wang, Qian; Cao, Jiawei; Payri, Raul (Elsevier, 2024-03)

[EN] As one of the most popular synthetic fuels (E-fuels), Polyoxymethylene dimethyl ethers(PODEX) have garnered significant attention among researchers in the compression ignition engine field. This work aims to provide ...
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 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) ...
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 novel inlet boundary condition for VOF-DNS simulations of the primary breakup of prefilming airblast atomizers

Payri, Raul; Salvador, Francisco Javier; Carreres, Marcos; Moreno-Montagud, Carlos (2021-09-02)

[EN] Prefilming airblast atomizers are becoming widely used in state-of-the-art aero engines. The planar configuration experimentally studied by the Karlsruhe Institute of Technology (KIT) has been computationally ...
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 needle lift influence over spray development for a prototype diesel direct acting piezoelectric injector

Viera Sotillo, Juan Pablo (Universitat Politècnica de València, 2014-05-19)

[ES] sta investigación consite en un estudio experimental para observar el desempeño hidráulico y evaporativo del inyector bajo distintas condiciones de levantamiento de aguja y varios perfiles de levantamiento. Se presentan ...
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 ...
Adquisición y análisis de velocidad y tamaño de gotas de un espray Diesel mediante la técnica experimental Anemometría de Fase Doppler (PDA)

Muñoz Lacedón, Pedro (Universitat Politècnica de València, 2022-10-14)

[ES] El trabajo actual trata el estudio de un sistema de inyección diésel moderno common rail que funciona con alta presión y, en consecuencia, con una pulverización muy densa. En un motor real, el chorro no se puede ver ...
An experimental study of gasoline effects on injection rate, momentum flux and spray characteristics using a common rail diesel injection system

Payri, Raul; García Martínez, Antonio; Domenech Llopis, Vicente; Durrett, Russell; Plazas, Alejandro H. (Elsevier, 2012-07)

A comparative study using diesel fuel and gasoline has been conducted focusing on the injection process. In this paper an experimental study has been carried out comparing the effects of the different fuels on the mass ...
Analysis of counterbore effect in five diesel common rail injectors

Payri, Raul; Hardy, Gilles; Gimeno, Jaime; Bautista-Rodríguez, Abián (Elsevier, 2019-10)

[EN] The present work assesses how the nozzle geometry, particularly the counterbore which is used in gasoline direct injection, could improve the fuel mixture when injecting in diesel engines, and ultimately, increase the ...
Analysis of diesel spray atomization by means of a near-nozzle field visualization technique

Payri Marín, Raúl; Salvador Rubio, Francisco Javier; Gimeno García, Jaime; De La Morena Borja, Joaquín (Begell House, 2011)

[EN] In this paper, a high-resolution visualization technique has been used in order to characterize Diesel spray structure in the near-nozzle field. For this purpose, three conical nozzles with different diameters have ...
ANALYSIS OF MIXING PROCESSES IN LIQUID AND VAPORIZED DIESEL SPRAYS THROUGH LIF AND RAYLEIGH SCATTERING MEASUREMENTS

Manin ., Julien Luc (Universitat Politècnica de València, 2011-03-04)

Desde su introducción, los motores de combustión interna alternativos han sido desarrollados con el fin de reducir el consumo y mejorar el rendimiento y facilidad de conducción. Con el tiempo, la contaminación se ha ...
Analysis of spray/wall impingement using an ECN single-hole injector and a controlled-temperature wall under realistic engine conditions

Peraza, Jesús E; Payri, Raul; Gimeno, Jaime; Carvallo-Garcia, Cesar (Elsevier, 2022-05-25)

[EN] Spray¿wall interactions (SWI) directly affect fuel¿air mixture and emissions formation. Therefore, they are considered among the most critical physical processes in engine research nowadays. However, the physics of ...
Analysis of the effects of wall temperature swing on reciprocating internal combustion engine processes

Andruskiewicz, Peter; Najt, P; Durrett, Russell; Biesboer, S; Schaedler, T; Payri, Raul (SAGE Publications, 2018)

[EN] A thermal wall temperature swing model was built to capture the transient effects of various material properties and coating layers on the intra-cycle wall temperature of an internal combustion engine. This model was ...
Analysis of the Influence of Diesel Spray Injection on the Ignition and Soot Formation in Multiple Injection Strategy

Payri, Raul; García-Oliver, José M; Mendoza, Victor; Viera, Alberto (MDPI AG, 2020-07)

[EN] Multiple injection strategies have increased their capabilities along with the evolution of injection system technologies up to the point that nowadays it is possible to inject eight different pulses, permitting to ...
Analysis of transient liquid and vapor phase penetration for diesel sprays undervariable injection conditions

Pastor Soriano, José Vicente; Payri Marín, Raúl; García Oliver, José María; Briceño Sánchez, Francisco Javier (Begell House, 2011)

The objective of this study is to investigate liquid length and vapor penetration for diesel sprays under highly transient injection conditions. High-speed Mie-scattering and shadowgraphy imaging of the spray evolution ...