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Beneficial Use of Water Hammer in a Gasoline Direct Injection System

[+] Author Affiliations
C. M. Bartolini, F. Caresana, L. Pelagalli

Università degli Studi di Ancona, Ancona, Italy

Paper No. FEDSM2003-45288, pp. 3057-3064; 8 pages
doi:10.1115/FEDSM2003-45288
From:
  • ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
  • Volume 1: Fora, Parts A, B, C, and D
  • Honolulu, Hawaii, USA, July 6–10, 2003
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3696-7 | eISBN: 0-7918-3673-8
  • Copyright © 2003 by ASME

abstract

This paper reports on the study of an injection system for internal combustion engines that exploits a water hammer oscillating circuit as the high pressure pump. This concept has recently been developed by the authors and successfully used in a direct-injection two-stroke gasoline engine prototype. The fluid dynamic behavior is characterized by unsteady flow in high length/diameter ratio pipes and is dominated by water hammer and cavitation. A numerical code was developed to gain a better understanding of these complex phenomena and as an optimization tool. The flow in the piping was solved by means of a 1D model suitable to describe the cavitation and unsteady friction. An ad hoc experimental analysis was performed to demonstrate model consistency in simple test cases of cavitating and non-cavitating flows. The model was then used in a numerical code for the simulation of the whole water hammer injection plant.

Copyright © 2003 by ASME

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