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.2015011589
pages 695-714

EFFECT OF ELASTICITY OF BOGER FLUIDS ON THE ATOMIZATION BEHAVIOR OF AN IMPINGING JET INJECTOR

Michele Negri
DLR− German Aerospace Center, Institute of Space Propulsion Lampoldshausen, Langer Grund, 74239 Hardthausen, Germany
Helmut K. Ciezki
German Aerospace Center (DLR), Institute of Space Propulsion, 74239 Hardthausen, Germany

ABSTRACT

Gelled propellants are of interest for rocket and ramjet propulsion systems because of their safety and performance benefits. During spray tests with doublets, such as on impinging jet injectors, it was observed that the breakup of the fluid sheet of several gels did not lead to the formation of droplets; instead, threadlike structures were formed. Such structures may cause a reduction in combustion efficiency and the accumulation of unburned material in the combustion chamber. The goal of the work presented here is to determine which physical properties influence thread formation. Spray tests were conducted with Boger fluids under atmospheric conditions concerning pressure and temperature with a like-on-like impinging jet injector. The range of injection velocities from 5 to over 70 m/s was studied. Images of the sprays were obtained with a shadowgraph technique. In order to obtain quantitative results from shadowgraph images, a code was implemented to determine a characteristic dimension of the threads. A clear correlation between the relaxation time, which is an indicator of the intensity of elastic effects, and the dimension of the obtained threads was observed. These results suggest that thread formation is caused by nonlinear elastic effects, while shear viscosity and surface tension do not seem to influence the formation of these structures.


Articles with similar content:

A HOLOGRAPHIC INVESTIGATION OF THE NEAR-NOZZLE STRUCTURE OF AN EFFERVESCENT ATOMIZER-PRODUCED SPRAY
Atomization and Sprays, Vol.5, 1995, issue 2
Paul E. Sojka, Philip J. Santangelo
BREAKUP OF DROPLETS OF NEWTONIAN AND NON-NEWTONIAN FLUIDS
Atomization and Sprays, Vol.6, 1996, issue 3
D. S. Whitelaw, Jim H. Whitelaw, C. Arcoumanis
PRIMARY BREAKUP OF NONTURBULENT ROUND LIQUID JETS IN GAS CROSSFLOWS
Atomization and Sprays, Vol.9, 1999, issue 3
J. Mazallon, G. M. Faeth, Z. Dai
CONTROLLING LIQUID JET BREAKUP WITH PRACTICAL PIEZOELECTRIC DEVICES
Atomization and Sprays, Vol.19, 2009, issue 2
Faryar Jabbari, Mina Rohani, Deanna Kristine Iobbi, Derek Dunn-Rankin
DISINTEGRATION OF LIQUID JETS FROM A COAXIAL DUAL NOZZLE, PART I: OBSERVATION OF BREAKUP PHENOMENA
Atomization and Sprays, Vol.7, 1997, issue 5
Soo-Young No, Masataka Arai, Kenji Amagai