Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

Volumes:
Volume 29, 2019 Volume 28, 2018 Volume 27, 2017 Volume 26, 2016 Volume 25, 2015 Volume 24, 2014 Volume 23, 2013 Volume 22, 2012 Volume 21, 2011 Volume 20, 2010 Volume 19, 2009 Volume 18, 2008 Volume 17, 2007 Volume 16, 2006 Volume 15, 2005 Volume 14, 2004 Volume 13, 2003 Volume 12, 2002 Volume 11, 2001 Volume 10, 2000 Volume 9, 1999 Volume 8, 1998 Volume 7, 1997 Volume 6, 1996 Volume 5, 1995 Volume 4, 1994 Volume 3, 1993 Volume 2, 1992 Volume 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.2017017949
pages 251-267

NEAR FIELD VISUALIZATION OF DIESEL SPRAY FOR DIFFERENT NOZZLE INCLINATION ANGLES IN NON-VAPORIZING CONDITIONS

Raul Payri
CMT–Motores Térmicos, Universitat Politècnica de València, Edificio 6D, Valencia, 46022, Spain
https://orcid.org/0000-0001-7428-5510
Gabriela Bracho
CMT - Motores Térmicos, Universitat Politècnica de València, Edificio 6D, 46022, Valencia, Spain
Pedro Marti-Aldaravi
CMT–Motores Térmicos, Universitat Politècnica de València, Edificio 6D, Valencia, 46022, Spain
Alberto Viera
CMT - Motores Térmicos, Universitat Politècnica de València, Edificio 6D, 46022, Valencia, Spain

RESUMO

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 real injectors, as the difference in inclination angles creates turbulent conditions at the nozzle outlet, consequences of which on the spray development are not yet fully understood. In this work, near-field visualization was done for two nozzle inclination angles in non-vaporizing conditions. Spray tip penetration, spreading angle, and axis angle fluctuations are reported. Three hypotheses are analyzed: liquid jet breakup mechanism, internal flow development, and cavitation. Experiments were carried out using n-Dodecane, testing a single orifice axially drilled and a three-orifice injector, from the Engine Combustion Network. The spray was observed with a diffused back-illumination technique and a long distance microscope, only visualizing the first 6 mm of spray tip penetration, for three injection pressures and four gas densities at ambient temperature. The multi-orifice injector produced a spray with wider spreading angle, which resulted in smaller penetration values. Additionally, higher spray axis angle fluctuations were observed for the multi-orifice injector, which increased for higher injection pressure and, to a lesser extent, with decreasing chamber density. Further analysis was performed with spreading angle fluctuations measurements, where results showed good agreement with spray axis angle fluctuations trends, implying that complex internal flow structures, and even incipient cavitation, could be present in the multi-orifice injector and be the cause of these spray axis angle fluctuations.


Articles with similar content:

ANALYSIS OF TRANSIENT LIQUID AND VAPOR PHASE PENETRATION FOR DIESEL SPRAYS UNDER VARIABLE INJECTION CONDITIONS
Atomization and Sprays, Vol.21, 2011, issue 6
Raul Payri, Francisco J. Briceno, Jose M. Garcia-Oliver, Jose V. Pastor
SPRAY VELOCITY AND DROP SIZE MEASUREMENTS IN FLASHING CONDITIONS
Atomization and Sprays, Vol.19, 2009, issue 2
Renaud Lecourt, Johan Steelant, Philippe Barricau
CHARACTERISTICS OF INTERIMPINGEMENT DIESEL SPRAY
Atomization and Sprays, Vol.12, 2002, issue 4
Takayuki Chiba, Masataka Arai, Kenji Amagai, Masahiro Saito
EXPERIMENTAL STUDY OF CONICAL DIESEL NOZZLE ORIFICE GEOMETRY
Atomization and Sprays, Vol.25, 2015, issue 6
Martti Larmi, Ossi Kaario, Tuomo Hulkkonen, Teemu Sarjovaara, Ismo Hamalainen
STRING CAVITATION IN A FUEL INJECTOR
Atomization and Sprays, Vol.27, 2017, issue 3
Tokihiro Katsui, Akira Sou, Shigeru Nishio, Raditya Hendra Pratama