Polytechnic University of Valencia Congress, ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems

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Evidence of vortex driven primary breakup in high pressure fuel injection
Junmei Shi, Pablo Aguado Lopez, Eduardo Gomez Santos, Noureddine Guerrassi, Gavin Dober, Wolfgang Bauer, Ming-Chia Lai, Jin Wang

Last modified: 18-07-2017

Abstract


This paper is to present a detailed case study on how the nozzle flow dynamics influences the primary breakup inthe spray formation process of diesel injection. The investigation was based on a 3-hole real-application nozzle with highly tapered injection holes using a URANS-LES (Large Eddy Simulation) hybrid approach in combination with the coupled Volume of Fluid (VOF) and Level Set method. High resolution LES was applied to simultaneously resolve the multi-scale nozzle flow dynamics downstream of the needle seat and the primary breakup process in the near-nozzle spray. Phase Contrast X-ray imaging (PCX) was applied to characterize the liquid-gas interfaces in the near-nozzle spray for validation purposes. The results provide detailed information on how the vortex shedding and vortex interactions in the injection hole drives the jet deformation, ligament anddroplet formation in the primary breakup process.

DOI: http://dx.doi.org/10.4995/ILASS2017.2017.5707


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