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Listar por palabra clave "Cavitation"

Mostrando ítems 1-20 de 39

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A CFD STUDY OF CAVITATION IN REAL SIZE DIESEL INJECTORS

Patouna, Stavroula (Universitat Politècnica de València, 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 comprehensive study on the effect of cavitation on injection velocity in diesel nozzles

López, J. Javier; Salvador Rubio, Francisco Javier; De La Garza De Leon, Oscar; Arregle, Jean Joseph Pierre (Elsevier, 2012-12)

Results when testing cavitating injection nozzles show a strong reduction in mass flow rate when cavitation appears (the flow is choked), while the momentum flux is reduced to a lesser extent, resulting in an increase in ...
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 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 ...
Adaptación de cuencos disipadores de resalto a condiciones fuera de su rango de diseño inicial. Aplicación al caso de las presas Españolas

García Hernández, Carlos Francisco (Universitat Politècnica de València, 2013-06-18)

[ES] La normativa en relación a la seguridad de presas y embalses es cada vez más exigente, obligando en muchos casos a la ampliación del aliviadero existente. De donde se tiene que la seguridad ante la inundación por ...
Analysis of the combined effect of hydrogrinding process and inclination angle on hydraulic performance of diesel injection nozzles

Salvador Rubio, Francisco Javier; Carreres Talens, Marcos; Jaramillo Císcar, David; Martínez López, Jorge (Elsevier, 2015-11-15)

A computational study to investigate the influence of the orifices inclination and the rounding radius at the orifice inlet (consequence of the hydro-erosive grinding process applied after the orifices machining) over the ...
Cavitation corrosion and repassivation kinetics of titanium in a heavy brine LiBr solution evaluated by using electrochemical techniques and Confocal Laser Scanning Microscopy

Fernández Domene, Ramón Manuel; Blasco Tamarit, María Encarnación; García García, Dionisio Miguel; García Antón, José (Elsevier, 2011-12-30)

The cavitation corrosion behaviour of commercially pure Grade 2 titanium in a 992 g/l LiBr solution has been investigated at 25 °C using an ultrasound device. Cavitation was found to have more influence on the anodic branch ...
CFD Study of Needle Motion Influence on the Spray Conditions of Single-Hole Injectors

Margot, Xandra Marcelle; Hoyas Calvo, Sergio; Fajardo, Pablo; Patouna, Stavroula (Begell House, 2011)

[EN] The spray characteristics and, consequently, the success of the Diesel combustion process is strongly affected by the manner in which fuel is introduced in the combustion chamber. This work consists in studying the ...
Comparative study of the internal flow in diesel injection nozzles at cavitating conditions at different needle lifts with steady and transient simulations approaches

Salvador, Francisco Javier; De La Morena, Joaquín; Crialesi Esposito, Marco; Martínez López, Jorge (SAGE Publications, 2018)

[EN] The motion of the needle during the injection process of a diesel injector has a marked influence on the internal flow, the fuel characteristics at the nozzle exit, the spray pattern and the fuel-air mixing process. ...
Comparison of microsac and VCO diesel injector nozzles in terms of internal nozzle flow characteristics

Salvador Rubio, Francisco Javier; Carreres Talens, Marcos; Jaramillo Císcar, David; Martínez López, Jorge (Elsevier, 2015-10)

A computational study focused on the inner nozzle flow and cavitation phenomena has been reported in this paper in order to investigate the two most common types of diesel injector nozzles at the present: microsac and valve ...
Computational study of the cavitation phenomenon and its interaction with the turbulence developed in diesel injector nozzles by Large Eddy Simulation (LES)

Salvador Rubio, Francisco Javier; Martínez López, Jorge; Romero Bauset, José Vicente; Roselló Ferragud, María Dolores (Elsevier, 2013-04)

Firstly, the code has been validated at real operating diesel engine conditions with experimental data in terms of mass flow, momentum flux and effective velocity, showing that the model is able to predict with a high level ...
Concerning dynamic effects in pipe systems with two-phase flows: pressure surges, cavitation and ventilation

Ramos, Helena M.; Fuertes-Miquel, Vicente S.; Tasca, Elias; Coronado-Hernández, Oscar E.; Besharat, Mohsen; Zhou, Ling; Karney, Bryan (MDPI AG, 2022-08)

[EN] The risks associated with unsteady two-phase flows in pressurized pipe systems must be considered both in system design and operation. To this end, this paper summarizes experimental tests and numerical analyses that ...
Effects of cavitation in common-rail diesel nozzles on the mixing process

López, J. Javier; De La Garza De Leon, Oscar; De La Morena, Joaquín; Martínez Martínez, Simón (SAGE Publications, 2017)

[EN] A study to experimentally analyze the effect of cavitation on the mixing process in diesel nozzles was carried out. The mixing process was studied through the spray cone angle. It was characterized in two different ...
Effects of Injection Nozzle Geometry on Spray Characteristics for Direct Injection Diesel Engines

Tamaki, Nobushige; Harada, Takato (Editorial Universitat Politècnica de València, 2017-07-28)

[EN] The purpose of this study is to improve the spray characteristics of a direct injection Diesel nozzle. Spray atomization of the multi-hole atomization enhancement nozzle, which was invented in previous studies, is ...
Effects of the area of a duplex stainless steel exposed to corrosion on the cathodic and anodic reactions in a LiBr solution under static and dynamic conditions

García-García, D.M.; Blasco-Tamarit, E.; Garcia-Anton, Jose (Electrochemical Science Group, 2011-05)

[EN] The objective of the work was to study the influence of the exposed area of the working electrode on the corrosion behavior of a duplex stainless steel (EN 1.4462) in a 992 g/l LiBr solution under static conditions ...
Electrothermal and acoustic techniques application in extraction processes. State of the art

Alepuz Salvador, Lucía (Universitat Politècnica de València, 2023-09-07)

[EN] A great amount of the food industry wastes includes important content of bioactive compounds, which can be extracted and applied in different sectors such as food, chemical or pharmaceutical areas. The application of ...
ESTUDIO DE LA INFLUENCIA DEL FENÓMENO DE LA CAVITACIÓN SOBRE EL FLUJO INTERNO EN TOBERAS DE INYECCIÓN DIESEL

Martínez López, Jorge (Universitat Politècnica de València, 2011-07-27)

El objetivo principal de la presente tesis es el modelado computacional de la cavitación en el interior de los orificios de las toberas de inyección Diesel durante el proceso de inyección, prestando especial atención a la ...
Estudio de la repasivación del daño generado por cavitación en el Alloy 31 y el titanio en una disolución concentrada de LiBr mediante técnicas electroquímicas y microscopía láser confocal

Fernández Domene, Ramón Manuel (Universitat Politècnica de València, 2011-09-05)

Se ha investigado el comportamiento del Alloy 31 y el titanio Grado2 frente a la corrosión en presencia de cavitación, en una disolución de 992 g/l de LiBr a 25ºC, usando un equipo de ultrasonidos. También se ha estudiado ...
Estudio mediante CFD de los efectos térmicos en el interior de las toberas de inyección y de la utilización de geometrías innovadoras sobre el comportamiento del chorro

Martínez-Miracle Muñoz, Enrique Carlos (Universitat Politècnica de València, 2019-10-29)

[ES] En los motores de combustión interna, el sistema de inyección representa una parte fundamental de la generación, tanto de la potencia y eficiencia energética, como en las emisiones contaminantes resultantes. Los ...
Evaluación de la eficiencia antibacteriana de recubrimientos sonoquímicos

Vizcaíno Gandía, Juan José (Universitat Politècnica de València, 2020-10-27)

[ES] Se pretende evaluar la efectividad antimicrobiana a lo largo del tiempo, en original y tras diversas tandas de ciclos de lavado, de un tejido con recubrimiento hecho por dos vías, una in situ (directamente sobre el ...