Influence of Nozzle Eccentricity on Spray Structures in Large Marine Diesel Sprays

Paper #:
  • 2017-24-0031

Published:
  • 2017-09-04
Abstract:
Large two-stroke marine diesel engines have special injector geometries, which differ substantially from the configurations used in most other Diesel engine applications. One of the major differences is that injector orifices are distributed in a highly non-symmetric fashion that affects the spray morphology. Earlier investigations demonstrated the dependency of the spray morphology on the location of the spray orifice, and therefore on the resulting flow conditions at the nozzle tip. Thus, spray structure is directly affected by the flow structure within the orifice [1]. Following recent LES resolved spray primary breakup studies [2], the present paper focuses on spray secondary breakup modelling of asymmetric spray structures in Euler-Lagrangian framework based on previous droplet distributions of primary breakup. Firstly, the derived droplet distributions are assigned via user coding to RANS 3D-CFD simulation of two nozzle bore geometries having 0.0 and 1.1 mm eccentricity. Simulations are validated against experimental measurements performed in a unique Spray Combustion Chamber [3] [4]. Further, effects of nozzle eccentricity are assessed under reactive and non-reactive conditions using a computationally efficient combustion solver. The methodology is found to be very promising for future implementation of droplet mapping techniques under marine Diesel engine conditions. [1] Imre Gergely Nagy, A. Schmid, S. Hensel, C. Dahnz, “Computational analysis of spray primary breakup in 2-stroke marine diesel engines with different nozzle layouts”, ICLASS 2015, Tainan, Taiwan, August 23-27. 2105 [2] Imre Gergely Nagy, A. Schmid and L. Kaiktsis, “Characterization of asymmetric structure of large marine diesel engine sprays”, First ECCO-MATE Conference, Lund, Sweden, June 6-10. 2016 [3] K. Herrmann, R. Schulz, G. Weisser, “Development of a reference experiment for a large diesel engine combustion system optimization”, CIMAC Congress Paper no.:98, Vienna 2007 [4] A. Schmid, B. v. Rotz, R. Schulz, K. Herrmann, G. Weisser, R. Bombach, “Influence of nozzle hole eccentricity on spray morphology“, ILASS 2013
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