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The characterisation of diesel cavitating flow using time-resolved light scattering

Lockett, R. D., Liverani, L., Thaker, D. and Arcoumanis, C. (2009). The characterisation of diesel cavitating flow using time-resolved light scattering. Paper presented at the IMechE Conference on Injection Systems for IC Engines, 13 - 14 May 2009, London, UK.

Abstract

A conventional six-hole valve-covered orifice (VCO) injector nozzle has been modified in order to provide optical access to the region below the needle, and the nozzle passages. This has been achieved through the removal of the metal tip, and its replacement with a transparent acrylic tip of identical geometry.

Elastic scattering of light obtained from the internal cavitating flow inside the nozzle holes of the optically accessible diesel injector tip was captured on a high speed electronic camera. The optical image data was obtained from a nozzle with a common rail pressure of 400 bar, and for two diesel fuels, in order to identify differences in cavitation behaviour.

A set of 100 mean diesel fuel injection images were obtained from 30 fuel injection pulses, for each operating condition. The imaged mean cavitation occurring in the nozzle holes was converted to the mean proportion of nozzle hole area producing cavitation scattering. The mean cavitation area images were then analysed, and were able to demonstrate the inverse relationship between fuel mass injected and the relative area producing cavitation scattering.

Publication Type: Conference or Workshop Item (Paper)
Publisher Keywords: diesel nozzle flow, cavitation, VCO diesel injector, elastic light scattering, imaging
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
URI: http://openaccess.city.ac.uk/id/eprint/2070
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