Accession Number:

ADA627108

Title:

High Fidelity Simulation of Atomization in Diesel Engine Sprays

Descriptive Note:

Conference paper

Corporate Author:

ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD VEHICLE TECHNOLOGY DIRECTORATE

Report Date:

2015-09-01

Pagination or Media Count:

16.0

Abstract:

A high fidelity numerical simulation of jet breakup and spray formation from a complex diesel fuel injector has been performed. A full understanding of the primary atomization process of diesel fuel injection has not been achieved for several reasons, including the difficulties in accessing the optically dense region. Due to recent advances in numerical methods and computing resources, high fidelity simulations of realistic atomizing flows are currently feasible, providing a new mechanism to study the jet breakdown process. In the present study, a novel volume-of-fluid VOF method coupled to a stochastic Lagrangian spray LSP model is employed to simulate the atomization process. A common rail fuel injector is modeled by a nozzle geometry provided by the engine combustion network ECN. The working conditions correspond to a single 90 microm orifice JP-8 fueled injector operating at 90 bar and 373 K and releasing into a 100 nitrogen, 29 bar, 300 K ambient with a Rel 16, 071 and Wel 75, 334, putting the spray in the full atomization mode. The experimental dataset from Army Research Lab ARL is used for validation and the Kelvin-HelmholtzRayleigh-Taylor KH-RT breakup model Reitz Bracco 1979 is used for verification, both in terms of spray angle. Droplet distributions of the simulated spray are provided for future experimental comparisons and secondary atomization simulations using LSP modeling.

Subject Categories:

  • Fluid Mechanics
  • Combustion and Ignition
  • Reciprocating and Rotating Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE