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UID:0-367@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180808T163000

DTEND;TZID=Asia/Jerusalem:20180808T173000

DTSTAMP:20230527T135824Z

URL:https://aerospace.technion.ac.il/events/the-influence-of-injectors-con
 figuration-on-the-quality-of-fuel-spray-during-start-up-in-jet-engines/

SUMMARY:The Influence of Injector's Configuration on the Quality of Fuel Sp
 ray During Start Up in Jet Engines
DESCRIPTION:Lecturer:Dafna Marcovici\n Faculty:Department of Aerospace Engi
 neering\n Institute:Technion – Israel Institute of Technology\n Location
 :Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstra
 ct: \n Details: \n Following a configuration change of F110 engines in the
  IAF\, fire balls had been seen during start-up in several engines. In the
  new configuration several components are replaced\, including fuel nozzle
 s (20 similar nozzles).\nIn order to prevent the fire balls appearance\, i
 t was chosen to replace the new fuel nozzles with the original nozzles con
 figuration (16 standard nozzles and 4 pilot nozzles on both sides of the i
 gnitors).\nThis work included assessment of the effect of the fuel spray c
 haracteristics on the appearance of fire balls during engine start-up as w
 ell as detailed examination of the spray process in the different nozzles 
 and its effect on the characteristics and quality of fuel spray in jet eng
 ines. In this work experiments were performed in order to characterize the
  fuel spray in each type of nozzle. In addition\, an analysis of the exper
 imental results was done in order to identify a link between the different
  fuel spray characteristics and the appearance of fire balls.\nThe experim
 ental results and analysis had shown that the new nozzles configuration pr
 ovide inferior fuel spray characteristics comparing the old nozzles. The r
 esults showed better diameter distribution and velocity in the original fu
 el nozzles. Moreover\, it was seen that the original pilot nozzle provides
  a "hollow cone" type of spray while the other types of nozzles provide ma
 ss flux mostly at the center of the spray.\nThe results showed that the or
 iginal nozzles configuration\, where pilot nozzles are located on both sid
 es of the ignitors\, provides a better fuel spray that allows for better c
 ombustion of the fuel droplets and as a result for better combustion of th
 e entire spray. Furthermore\, it was found that the fuel spray provided by
  the new nozzles configuration makes it harder for the combustion to consu
 me all the fuel in the combustion case and therefore represents\, in high 
 probability\, a potential cause for the appearance of fire balls in the en
 gines.\nAdditionally\, a review was done of all other changes that were do
 ne in the new engine configuration and their effect on appearance of fire 
 balls. This work has focused on the replacement of the fuel nozzles and it
  was found that the original configuration allows for better combustion. H
 owever\, it would seem that the fire balls appeared due to the combination
  of several changes in the engine\, Therefore\, further investigation is n
 eeded in order to explore the combined influence of the changes done in th
 e engine on the fire balls appearance.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20180323T030000

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