图书馆订阅: Guest
Begell Digital Portal Begell 数字图书馆 电子图书 期刊 参考文献及会议录 研究收集
雾化与喷雾
影响因子: 1.262 5年影响因子: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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

雾化与喷雾

DOI: 10.1615/AtomizSpr.v20.i5.60
pages 453-465

DIESEL SPRAY BEHAVIOR AT COMPRESSION RATIOS UP TO 100:1

Matt N. Svrcek
Department of Mechanical Engineering, Stanford University, USA
S. L. Miller
Department of Mechanical Engineering, Stanford University, USA
Christopher F. Edwards
Thermosciences Division, Department of Mechanical Engineering, Stanford University, Stanford, CA, USA

ABSTRACT

Increasing the compression ratio of a simple-cycle engine beyond 100:1 can enable first law efficiency approaching 60% if losses relative to the ideal cycle can be maintained similar to existing engines. Achieving this in practice will require understanding and managing the combustion process in the unique environment that results from such a high compression ratio. As a first step, this paper examines the behavior of combusting and noncombusting single-plume diesel sprays in a free-piston, extreme-compression device for compression ratios ranging from 30:1 to 100:1. High-speed schlieren photography through full bore optical access in the end wall of the combustor provides imaging of the spray. Spray penetration and dispersion (via spray angle) are measured as functions of time for each compression ratio, for both nonreacting and reacting sprays. For the combusting-spray experiments, ignition delay based on OH luminosity is also recorded via a high-sensitivity photodiode. A separate set of experiments using a diffuse back-illumination method provides measurements of penetration of the liquid phase spray region as a function of time and compression ratio. The results of this study are shown to be in general agreement with the current understanding of spray behavior as a function of parameters such as gas density, even when extended to this new regime. However, the steep free-piston motion profile results in density conditions varying greatly during the course of injection at the higher compression ratios, which in turn affects the spray penetration and spreading. Furthermore, a significant effect of in-cylinder fluid motion on the spray is observed. This effect becomes stronger at the higher compression ratios, likely due to the ratio of ambient density to spray density becoming low.


Articles with similar content:

VIEWS ON THE STRUCTURE OF TRANSIENT DIESEL SPRAYS
Atomization and Sprays, Vol.10, 2000, issue 3-5
Gregory J. Smallwood, Omer L. Gulder
REAL-TIME X-RAY RADIOGRAPHY STUDY OF LIQUID JET BREAKUP FROM ROCKET ENGINE COAXIAL INJECTORS
International Journal of Energetic Materials and Chemical Propulsion, Vol.3, 1994, issue 1-6
R. D. Woodward, Fan Bill Cheung, R. L. Burch
EFFECT OF THE LIQUID INJECTION ANGLE ON THE ATOMIZATION OF LIQUID JETS IN SUBSONIC CROSSFLOWS
Atomization and Sprays, Vol.24, 2014, issue 1
H. Almeida, J. M. M. Sousa, Mário Costa
STRUCTURE OF REACTING AND NONREACTING, NONSWIRLING, AIR-ASSISTED SPRAYS, PART II: DROP BEHAVIOR
Atomization and Sprays, Vol.3, 1993, issue 4
M. Adachi, G. Scott Samuelsen, Vincent McDonell
CORRELATION OF INTACT-LIQUID-CORE LENGTH FOR COAXIAL INJECTORS
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems, Vol.0, 1994, issue
Fan Bill Cheung, R. D. Woodward, R. L. Burch, Kenneth K. Kuo