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.v10.i2.60
19 pages

AN EXPERIMENTAL AND ANALYTICAL STUDY OF THE SPRAY CHARACTERISTICS OF AN INTERMITTENT AIR-ASSISTED FUEL INJECTOR

Changsoo Jang
Department of Mechanical Engineering, KAIST, Taejon, Korea
Sung-Soo Kim
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon, South Korea
Sangmin Choi
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Yusong-gu, Taejon, Korea

Краткое описание

Spray characteristics of an intermittent air-assisted fuel injector (AAFI) for a four-stroke gasoline direct-injection engine were investigated using a photographic imaging system. The spatial spray structures were acquired in terms of Sauter mean diameter (D32) and liquid mass concentration. Air entrainment motion was observed just below the poppet valve. Influence of parameters such as ambient air density, supply pressure, and injected air-liquid mass ratio (ALR) was examined. D32 varied from 9 to 30 μm throughout all experimental conditions. The result exhibited a similar tendency to those from diesel injectors in spray tip penetration and atomization characteristics. An intermittent injection caused temporally nonuniform ALR through an injection period. Introducing a set of plausible assumptions, the influence of instantaneous ALR (IALR) on temporary atomization quality was assessed. It showed a comparable trend with that of ALR on D32 of overall spray. The best-fitting curve for drop size distributions of sprays from the AAFI appeared to be a log-Boltzman function. A simple analytical modeling was introduced for predicting mean drop diameters of the AAFI with respect to various operating parameters considered in this study. The model-based equation was found to fit experimental data with an error range comparable to the empirical correlation.