Modelling the Effect of Modulations of the Injection Velocity on the Structure of Diesel Sprays

Paper #:
  • 961126

Published:
  • 1996-05-01
Citation:
Chaves, H. and Obermeier, F., "Modelling the Effect of Modulations of the Injection Velocity on the Structure of Diesel Sprays," SAE Technical Paper 961126, 1996, https://doi.org/10.4271/961126.
Pages:
12
Abstract:
Under diesel engine conditions the exit velocity of diesel fuel out of an injection nozzle depends on the temporal increase of the supply pressure. Therefore, heading ‘slow’ fuel elements are caught up by ‘fast’ elements leaving the nozzle at a later time. Similar processes occur in modulated flow. This kind of interaction (‘collision’) of liquid elements produces a free internal stagnation point, which moves along the spray axis. From the free stagnation point the liquid is ejected in radial direction, which results in mushroom shaped structures along the spray. A similar structure is observed at the tip of the spray. The spray structures have been observed in modulated laminar laboratory jets as well as in turbulent diesel injection sprays under atmospheric conditions. A model is presented which describes the propagation speed of the stagnation points and the radial and axial flow velocities out of the stagnation points. It also predicts the net mass flux out of the structures.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Article
2017-03-13
Training / Education
2018-03-26
Training / Education
2018-06-05
Training / Education
1999-09-27