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.
Beneficial Use of Water Hammer in a Gasoline Direct Injection System
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Bartolini, CM, Caresana, F, & Pelagalli, L. "Beneficial Use of Water Hammer in a Gasoline Direct Injection System." Proceedings of the 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. pp. 3057-3064. ASME. https://doi.org/10.1115/FEDSM2003-45288
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