Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector
In this study, Schlieren visualization tests have been performed for a prototype diesel common rail direct-acting piezoelectric injector, to understand the influence of fuel injection rate shaping on the vapor spray development under evaporative and non-reacting conditions. This state of the art inj...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/43341 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/43341 |
| Access Level: | acceso abierto |
| Palabra clave: | Diesel Lift profile Injection rate Spray momentum Vapor penetration MAQUINAS Y MOTORES TERMICOS |
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Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injectorPayri, RaulGimeno, JaimeViera, Juan P.Plazas Torres, Alejandro HernánDieselLift profileInjection rateSpray momentumVapor penetrationMAQUINAS Y MOTORES TERMICOSIn this study, Schlieren visualization tests have been performed for a prototype diesel common rail direct-acting piezoelectric injector, to understand the influence of fuel injection rate shaping on the vapor spray development under evaporative and non-reacting conditions. This state of the art injector presents a particular feature that permits full needle lift control through a parameter referred to as piezo stack charge level, enabling various fuel injection rate typologies. A fast camera and a two pass Schlieren visualization setup have been utilized to record high speed images of the injection event and later analyze, through the vapor phase, the transient evolution of the spray. The tests have been performed employing a novel continuous flow test vessel that provides an accurate control of ambient temperature and pressure up to 1000 K and 15 MPa respectively. The effect of ambient temperature, injection pressure, needle lift and needle lift profile were studied. Data obtained is correlated to previous liquid length and injection rate measurements of the same injector. Results show, as expected for all cases, that instant vapor penetration rate is closely related to instant injection rate. This is confirmed by the injection pressure test results, along with those obtained for the three different piezo stack charge levels, both affecting the vapor penetration in a similar way. Nevertheless, results obtained for the three different charge levels show that the influence of the charge level and the injection pressure differ in the very beginning of the injection event, where the spray development is largely determined by needle lift and not injection pressure. Ambient temperature alone seems not to have and important effect on vapor penetration. Finally, the effects of the needle lift profile in the instant injection rate and vapor penetration are presented, confirming the strong relation between these three parameters, and confirming also that the needle lift plays a determinant role in the spray development, especially at the early stages of the injection process. Both boot and ramp shaped injections proved the ability to strongly influence the vapor penetration rate. In comparison to the square shaped injection, the effect of the ramp shaped injection delays the vapor penetration right from the start of injection while the effect of the boot shaped injection takes considerably longer to become noticeable. From the results, the needle lift control feature has proven to be a very versatile tool for engine designers to control the injection process as desired, opening a new path with a plenty of room for improvement.he authors would like to thank general motors company for their financial support and its cooperation during the project and José Enrique del Rey* and Michele Bardi* for their collaboration in the experimental measurements and setup. (*) From CMT-Motores Térmicos. Universitat Politecnica de Valencia.ElsevierGeneral Motors CorporationRepositorio Institucional de la Universitat Politècnica de València Riunet20132013-11-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://riunet.upv.es/handle/10251/43341reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valénciainstname:Universitat Politècnica de València (UPV)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Reserva de todos los derechoshttp://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:riunet.upv.es:10251/433412026-06-13T07:49:27Z |
| dc.title.none.fl_str_mv |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector |
| title |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector |
| spellingShingle |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector Payri, Raul Diesel Lift profile Injection rate Spray momentum Vapor penetration MAQUINAS Y MOTORES TERMICOS |
| title_short |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector |
| title_full |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector |
| title_fullStr |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector |
| title_full_unstemmed |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector |
| title_sort |
Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector |
| dc.creator.none.fl_str_mv |
Payri, Raul Gimeno, Jaime Viera, Juan P. Plazas Torres, Alejandro Hernán |
| author |
Payri, Raul |
| author_facet |
Payri, Raul Gimeno, Jaime Viera, Juan P. Plazas Torres, Alejandro Hernán |
| author_role |
author |
| author2 |
Gimeno, Jaime Viera, Juan P. Plazas Torres, Alejandro Hernán |
| author2_role |
author author author |
| dc.contributor.none.fl_str_mv |
General Motors Corporation Repositorio Institucional de la Universitat Politècnica de València Riunet |
| dc.subject.none.fl_str_mv |
Diesel Lift profile Injection rate Spray momentum Vapor penetration MAQUINAS Y MOTORES TERMICOS |
| topic |
Diesel Lift profile Injection rate Spray momentum Vapor penetration MAQUINAS Y MOTORES TERMICOS |
| description |
In this study, Schlieren visualization tests have been performed for a prototype diesel common rail direct-acting piezoelectric injector, to understand the influence of fuel injection rate shaping on the vapor spray development under evaporative and non-reacting conditions. This state of the art injector presents a particular feature that permits full needle lift control through a parameter referred to as piezo stack charge level, enabling various fuel injection rate typologies. A fast camera and a two pass Schlieren visualization setup have been utilized to record high speed images of the injection event and later analyze, through the vapor phase, the transient evolution of the spray. The tests have been performed employing a novel continuous flow test vessel that provides an accurate control of ambient temperature and pressure up to 1000 K and 15 MPa respectively. The effect of ambient temperature, injection pressure, needle lift and needle lift profile were studied. Data obtained is correlated to previous liquid length and injection rate measurements of the same injector. Results show, as expected for all cases, that instant vapor penetration rate is closely related to instant injection rate. This is confirmed by the injection pressure test results, along with those obtained for the three different piezo stack charge levels, both affecting the vapor penetration in a similar way. Nevertheless, results obtained for the three different charge levels show that the influence of the charge level and the injection pressure differ in the very beginning of the injection event, where the spray development is largely determined by needle lift and not injection pressure. Ambient temperature alone seems not to have and important effect on vapor penetration. Finally, the effects of the needle lift profile in the instant injection rate and vapor penetration are presented, confirming the strong relation between these three parameters, and confirming also that the needle lift plays a determinant role in the spray development, especially at the early stages of the injection process. Both boot and ramp shaped injections proved the ability to strongly influence the vapor penetration rate. In comparison to the square shaped injection, the effect of the ramp shaped injection delays the vapor penetration right from the start of injection while the effect of the boot shaped injection takes considerably longer to become noticeable. From the results, the needle lift control feature has proven to be a very versatile tool for engine designers to control the injection process as desired, opening a new path with a plenty of room for improvement. |
| publishDate |
2013 |
| dc.date.none.fl_str_mv |
2013 2013-11-01 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://riunet.upv.es/handle/10251/43341 |
| url |
https://riunet.upv.es/handle/10251/43341 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 Reserva de todos los derechos http://rightsstatements.org/vocab/InC/1.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 Reserva de todos los derechos http://rightsstatements.org/vocab/InC/1.0/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf application/pdf |
| dc.publisher.none.fl_str_mv |
Elsevier |
| publisher.none.fl_str_mv |
Elsevier |
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reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname:Universitat Politècnica de València (UPV) |
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