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Listar por palabra clave "Diesel injection"

Mostrando ítems 1-20 de 20

Caracterización temporal mediante técnicas ópticas de chorro diésel provocado por inyecciones múltiples cercanas

Tortosa Serrano, Alejandro (Universitat Politècnica de València, 2018-09-10)

[ES] La necesidad de mejorar el rendimiento de los motores de combustión interna alternativos hace indispensable centrarse en uno de los parámetros más determinantes en cuanto a su funcionamiento: el proceso de inyección ...
Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector

Payri, Raul; Salvador Rubio, Francisco Javier; Manin, Julien; Viera Sotillo, Alberto Antonio (Elsevier, 2016-01-15)

In this paper, lift-off length has been measured via both broadband luminosity and OH chemiluminescence. In addition, ignition delay has also been measured via broadband chemiluminescence and Schlieren imaging. A 3 orifice ...
Differences between single and double-pass schlieren imaging on diesel vapor spray characteristics

Payri, Raul; Salvador, Francisco Javier; Bracho Leon, Gabriela; Viera-Sotillo, Alberto Antonio (Elsevier, 2017-10)

[EN] The use olschlieren imaging at high acquisition rate has been adopted as a standard optical technique for the analysis of vaporizing diesel sprays under engine-like conditions. A single-pass schlieren arrangement is ...
Effect of geometry of real-size transparent nozzles on cavitation and on the atomizing jet in the near field

Cao, Yujun; Idlahcen, Said; Blaisot, Jean-Bernard; Rozé, Claude; Méès, Loïc; Maligne, David (Editorial Universitat Politècnica de València, 2017-07-28)

[EN] Cavitation inception is very sensitive to the nozzle geometry. Two diesel-like transparent nozzles with sharp and round inlet edge were investigated under moderate injection pressure. By means of backlight imaging ...
Effect of high injection pressures and ambient gas properties over the macroscopic characteristics of the diesel spray on multi-hole nozzles

GIRALDO-VALDERRAMA, JHOAN SEBASTIAN; Payri, Raul; Marti-Aldaravi, Pedro; Montiel-Prieto, Tomas (Begell House Inc., 2018)

[EN] In this work, the effect of high injection pressures and ambient gas properties on diesel spray penetration and spreading angle are studied. To this end a multi-hole piezoelectric injector was used, and MIE-scattering ...
Effect of multiple injection strategies on the Diesel spray formation and combustion using optical diagnostics

Viera Sotillo, Alberto Antonio (Universitat Politècnica de València, 2019-07-22)

[ES] En los últimos años, la evolución de las tecnologías de inyección ha permitido no solo mejorar el proceso de mezcla, sino también controlar con precisión los parámetros de inyección, agregando flexibilidad a los ...
Engine combustion network: Influence of the gas properties on the spray penetration and spreading angle

Payri González, Francisco; Payri Marín, Raúl; Bardi, Michele; Carreres Talens, Marcos (Elsevier, 2014-02)

In this work, three Engine Combustion Network (ECN) single-hole nozzles with the same nominal characteristics have been tested under a wide range of conditions measuring spray penetration and spreading angle. n-Dodecane ...
Estudio experimental del comportamiento de la combustión en inyectores diésel multiorificios mediante la visualización de la llama y la concentración de hollín

Cardona Vargas, Santiago (Universitat Politècnica de València, 2017-08-29)

This work presents the measurements of the study of two piezoelectric injectors in a new vessel of high pressure and high temperature, available in the research group CMT-Motores Térmicos, which has big optical accesses ...
Experimental and numerical study of lift-off length and ignition delay of a two-component diesel surrogate

Payri, Raul; Viera Sotillo, Juan Pablo; Pei, Yuanjiang; Som, Sibendu (Elsevier, 2015-10-15)

Understanding and controlling mixing and combustion processes is fundamental for the ever more demanding pollutant regulations and fuel consumption standards of direct injection diesel engines. The fundamentals of these ...
Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector

Benajes Calvo, Jesus Vicente; Payri Marín, Raúl; Bardi, Michele; Marti-Aldaravi, Pedro (Elsevier, 2013-09)

In this work, lift-off length and ignition delay have been measured via chemiluminescence techniques in a wide range of conditions for a single-hole injector from the Engine Combustion Network (ECN) dataset and using a ...
Flow regime effects on non-cavitating injection nozzles over spray behaviour

Payri, Raul; Salvador, F.J.; Gimeno, Jaime; Novella Rosa, Ricardo (ELSEVIER SCIENCE INC, 2011)

[EN] This paper deals with the influence of flow regime (laminar, transition or turbulent) on the internal flow behavior, and how it affects the spray development in diesel nozzles. In particular, the research described ...
Flow regime effects over non-cavitating diesel injection nozzles

Payri, Raul; Salvador, F.J.; Gimeno, Jaime; García Martínez, Antonio (SAGE PUBLICATIONS LTD, 2012)

[EN] The research conducted and explained in this paper aims to explore and understand the influence of flow regime (laminar, transition or turbulent) inside diesel injector nozzles. For this purpose, an experimental study ...
Influence of aging of a diesel injector on multiple injection strategies

Payri, Raul; Marti-Aldaravi, Pedro; Montiel-Prieto, Tomas; Viera, Alberto (Elsevier, 2020-11-25)

[EN] Multiple injection strategies have contributed to the improvement of thermal processes in Internal Combustion Engines. On this matter, the correct performance of the injector is a critical factor in the implementation ...
Macroscopic and microscopic characterization of non-reacting diesel sprays at low and very high injection pressures

Giraldo Valderrama, Jhoan Sebastián (Universitat Politècnica de València, 2018-12-10)

En la exploración de nuevos métodos para el mejoramiento de la eficiencia y rendimiento del motor diésel, es claro que un gran esfuerzo debe estar enfocado en el proceso de inyección de combustible. La eficiencia de la ...
Measurements of the mass allocation for multiple injection strategies using the rate of injection and momentum flux signals

Payri, Raul; Gimeno, Jaime; Marti-Aldaravi, Pedro; Viera, Alberto (SAGE Publications, 2021-04)

[EN] As legislations set very stringent environmental and fuel economy standards, researchers have pushed into a continuous development in all areas of the diesel engine. The recent evolution of the injection technologies ...
Near field visualization of diesel spray for different nozzle inclination angles in non-vaporizing conditions

Payri, Raul; Bracho Leon, Gabriela; Marti-Aldaravi, Pedro; Viera-Sotillo, Alberto Antonio (Begell House Inc., 2017)

[EN] Accurate experimental data are often needed to validate computational fluid dynamics models. These models regularly rely on experimental results from single-orifice axially drilled nozzles that do not fully represent ...
Potential and Limitations of Dual Fuel Operation of High Speed Large Engines

Redtenbacher, Christoph; Kiesling, Constantin; Malin, Maximilian; Wimmer, Andreas; Pastor, José V.; Pinotti, Mattia (ASME International, 2018-03)

[EN] The aim of this paper is to identify and investigate the potential and limitations of diesel-gas combustion concepts for high speed large engines operated in gas mode with very small amounts of pilot fuel (<5% diesel ...
Rate of injection measurements of a direct-acting piezoelectric injector for different operating temperatures

Payri, Raul; Gimeno, Jaime; Mata, Carmen; Viera-Sotillo, Alberto Antonio (Elsevier, 2017-12-15)

[EN] As the regulations for pollutant emissions in diesel engines are increasingly restrictive, the introduction of the piezoelectric direct-acting injectors seeks to improve the overall efficiency of the injection system, ...
Understanding the effect of inter-jet spacing on lift-off length and ignition delay

Payri, Raul; Gimeno, Jaime; Carreres, Marcos; Montiel-Prieto, Tomas (Elsevier, 2021-08)

[EN] In recent years, injectors with multiple outlet-holes and smaller diameters have been implemented to reduce pollutant emissions during the combustion development. Nevertheless, increasing the number of holes has also ...
Vapor phase penetration measurements with both single and double-pass Schlieren for the same injection event

Payri, Raul; Salvador Rubio, Francisco Javier; Bracho León, Gabriela Cristina; Viera Sotillo, Alberto Antonio (Editorial Universitat Politècnica de València, 2017-07-28)

[EN] Schlieren imaging has been adopted as a standard optical technique for the analysis of diesel sprays under engine like conditions. A single-pass Schlieren arrangement is typically used for the study of single-orifice ...