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Fuel distribution visualization from an air-assisted injector in a spray chamber

Mikael Skogsberg (Institutionen för termo- och fluiddynamik) ; Petter Dahlander (Institutionen för termo- och fluiddynamik) ; Fredrik Persson (Institutionen för experimentell fysik, Molekylfysik) ; Stina Hemdal (Institutionen för experimentell fysik, Molekylfysik) ; Ingemar Denbratt (Institutionen för termo- och fluiddynamik)
Comodia 2004, Yokohama, 2-5 aug 2004 (2004)
[Konferensbidrag, refereegranskat]

Optical measurements have been performed to visualize the fuel distribution from an air-assisted GDI injector in a constant volume spray chamber. In the air-assisted injector, fuel droplet breakup occurs as the droplets are accelerated by the expanded air flow passing out through the injector nozzle. The injector design allows for two distinct modes of operation: stratified (low load) and homogenous (full load). Therefore, measurements were taken at back-pressure and temperature settings corresponding to both low and full loads, to investigate the influence of these variables on fuel distribution, droplet sizes and velocities in the two modes. Results from PDA measurements show that most of the droplet break-up occurs inside the nozzle. Downstream of the nozzle, rates of break-up and evaporation are low. The cause of the low breakup and evaporation rates downstream of the nozzle is believed to be the low relative velocity between the liquid fuel and the surrounding cold air jet. The fuel distribution has been visualized qualitatively by simultaneous MIE and LIF measurements with two intensified digital cameras in combination with a 266 nm YAG-laser.

Nyckelord: Spray Chamber, LIF, MIE, Direct imaging and PDA

Denna post skapades 2006-08-28. Senast ändrad 2012-06-07.
CPL Pubid: 1784


Institutioner (Chalmers)

Institutionen för termo- och fluiddynamik (1989-2004)
Institutionen för experimentell fysik, Molekylfysik (1997-2005)


Teknisk mekanik

Chalmers infrastruktur

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Denna publikation ingår i:

A Study on Spray-Guided Stratified Charge Systems for Gasoline DI Engines