Title: Experimental and numerical investigation of diesel spray behaviour in high pressure common-rail systems

Authors: Cem Sorusbay, Abdurrahman Imren, Metin Ergeneman, Gerardo Valentino, Luigi Allocca

Addresses: Mechanical Engineering Faculty, Istanbul Technical University, Automotive Engineering Division, Gumussuyu, Istanbul 34437, Turkey. ' Mechanical Engineering Faculty, Istanbul Technical University, Automotive Engineering Division, Gumussuyu, Istanbul 34437, Turkey. ' Mechanical Engineering Faculty, Istanbul Technical University, Automotive Engineering Division, Gumussuyu, Istanbul 34437, Turkey. ' Istituto Motori, CNR, Naples 80125, Italy. ' Istituto Motori, CNR, Naples 80125, Italy

Abstract: The behaviour of a diesel spray, generated by a common-rail injection system, has been investigated. The experimental investigation was carried out by testing a high pressure injection system, for heavy duty direct injection marine diesel engines, to calibrate a reliable model for the simulation of liquid jet atomisation and droplet break-up of the fuel spray. The experimental facility comprised instantaneous measurements of the fuel injection rate and the characterisation of the spatial and temporal evolution of the diesel spray, injected in a high pressure, non-evaporative quiescent vessel. The fuel tip penetration was estimated by digital processing of spray images captured at different instants after the start of injection. The spray was modelled using KIVA-3v algorithm, with a Kelvin-Helmholtz, Rayleigh-Taylor spray break-up model on a 45° sector grid. The mathematical model was verified with experimental results and a reasonable agreement was obtained.

Keywords: diesel sprays; KH-RT; Kelvin-Helmholtz; Rayleigh-Taylor; spray modelling; spray penetration; common-rail injection systems; direct injection engines; marine diesel engines; simulation; liquid jet atomisation; droplet break-up; fuel injection; digital processing; mathematical modelling.

DOI: 10.1504/IJVD.2009.024968

International Journal of Vehicle Design, 2009 Vol.50 No.1/2/3/4, pp.50 - 65

Published online: 06 May 2009 *

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