Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Atomization and Sprays
Импакт фактор: 1.262 5-летний Импакт фактор: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Печать: 1044-5110
ISSN Онлайн: 1936-2684

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

Atomization and Sprays

DOI: 10.1615/AtomizSpr.v15.i4.20
pages 377-400

ANOMALOUS GROUP COMBUSTION PHENOMENA IN DI DIESEL ENGINES

Hsin-Luen Tsai
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan,70101, ROC
Huei-Huang Chiu
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan,70101, ROC

Краткое описание

Diesel engine combustion phenomena, structures, and evolution in burning modes are studied based on anomalous and normal group combustion theories and numerical simulation, with updated KIVA-3V code, which is implemented with the droplet state criteria, laws of interacting droplet, models of droplet breakup, and gas-phase ignition. The predicted diesel combustion processes occur in a remarkably well-ordered sequence: (1) spray formation; (2) autoignition; (3)flame propagating premixed combustion, which consumes the combustible mixture created during the preignition period; (4)partially premixed combustion and droplet combustion in the downstream of the liquid jet due to air entrainment in the lifted flame configuration; and (5) primary mixing controlled, external or internal group flame (stabilized by the recirculating flow, induced by the vortices produced by injection and piston motion in the compression or expansion phase). The temporal variation of the extent of collective interaction, expressed by the instantaneous global Chiu number Gc is also predicted to explain the evolutional variation of the diesel anomalous group combustion field structure. The Gc value exhibits a dramatic reduction during the flame-propagating premixed combustion, reflecting rapid weakening of the collective behavior of the spray. The ratio of the Gc value at the beginning, and after the premixed combustion, is found to be 6.4 for the Caterpillar engine, and 15.6 for the Cummins engine. The latter is caused by intense premixed combustion. The mean group combustion number during the mixing controlled burn period is of the order of 0.5−1.5; thus, the sprays burn globally with external group combustion. The effects of fuel injection time, initial values of orifice radius, and group combustion number, and the compression ratio on the ignition delay, time of the onset of mixing controlled external combustion, are examined. Areas of future research are also discussed.


Articles with similar content:

ANOMALOUS GROUP COMBUSTION THEORY: TRANSIENT DUALITY IN GROUP COMBUSTION
International Journal of Energetic Materials and Chemical Propulsion, Vol.4, 1997, issue 1-6
C. L. Lin, Huei-Huang Chiu, T. S. Li
COMPARATIVE EVALUATION OF THE RE-ENTRANT AND FLAT TOROIDAL COMBUSTION CHAMBERS IN A DIRECT-INJECTION DIESEL ENGINE USING COMPUTATIONAL FLUID DYNAMICS
Computational Thermal Sciences: An International Journal, Vol.6, 2014, issue 2
R. Thundil Karuppa Raj, R. Manimaran
CFD SIMULATION OF FLOW FIELD AND HEAT TRANSFER IN A SINGLE-CYLINDER HCCI ENGINE AT DIFFERENT BOUNDARY CONDITIONS
Computational Thermal Sciences: An International Journal, Vol.10, 2018, issue 4
Renganathan Manimaran, Rajagopal Thundil Karuppa Raj
AN EXPERIMENTAL STUDY OF THREE INTERACTING VAPORIZING FUEL DROPLETS IN A FORCED CONVECTIVE LAMINAR FLOW
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems, Vol.0, 1994, issue
Iskendar Gokalp, Christian Chauveau, N.A Ramos-Arroyo
AUTOIGNITION CHARACTERISTICS OF DIESEL SPRAYS UNDER DIFFERENT INJECTION CONDITIONS
Atomization and Sprays, Vol.6, 1996, issue 4
Raffaele Ragucci, Antonio Cavaliere, C. Noviello