Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Atomization and Sprays
Impact-faktor: 1.189 5-jähriger Impact-Faktor: 1.596 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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

Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013006408
pages 1-22

MACROSCOPIC SPRAY CHARACTERISTICS OF A POROUS INJECTOR

Dohun Kim
Department of Aerospace and Mechanical Engineering, Graduate School of Korea Aerospace University, Korea
Inchul Lee
Department of Aerospace and Mechanical Engineering, Graduate School of Korea Aerospace University, Korea
Jaye Koo
School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang, Gyeonggi, 412-791, Republic of Korea

ABSTRAKT

The concept of coaxial porous injector design for gas-liquid mixing involves improved momentum transfer between the gas and liquid jets by changing the gas injecting direction of a conventional liquid-centered shear coaxial injector from parallel to perpendicular using porous material. Cold-flow tests of the coaxial porous injector and the shear coaxial injector in two-dimensional configurations were carried out to compare the macroscopic characteristics of sprays from each injector and to understand the effects of spraying conditions on the breakup length and the spray angle. The spray patterns were visualized using the shadowgraphy technique. The shadowgraph images recorded in high speed were post-processed to detect the breakup length and the spray angle. The post-processing code filters the dynamic pixels, and leaves the stationary pixels, which corresponds to the liquid core and the background. The most significant differences between the porous injector and the shear injector in the two-dimensional configurations were the spray angle and the uniformity of the disintegrated liquid jet. The liquid column from the shear injector was not split off entirely, and only the portion at the interface between the gas and liquid jet was atomized by the shear force. On the other hand, the liquid jet from the porous injector dispersed more widely, and was disintegrated into droplets more completely in most experimental cases of similar axial momentum flux ratio conditions at the injector tip, and it was thought that an optimal porous element length for the best mixing performance exists at certain injection conditions.