Date of Award

2012

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Computational Science and Engineering (PhD)

College, School or Department Name

Department of Mathematical Sciences

Advisor

Franz X Tanner

DOI

10.37099/mtu.dc.etds/729

Abstract

This thesis covers two main topics. The first is the comparison between the Reynoldsaveraged Navier-Stokes (RANS) simulation and the Large Eddy Simulation (LES) of high injection pressure diesel sprays under non-evaporating or evaporating conditions. The second topic is the comparison of the fuel behavior in the spray process between the hydrotreated vegetable oil (HVO) and the conventional EN 590, diesel #2 and n-heptane fuels.

To validate the RANS and LES spray simulations, comparisons were made with experimental data. The LES turbulence model, the initial drop size distribution (IDSD), the Levich jet breakup model and the CAB drop breakup model are realized into the Open- FOAM code. The liquid phase models, including the drop atomization, breakup, collision and evaporating models, are tested and tuned such that the simulated penetration curves are near to the experimental ones. The spray penetration, fuel velocity, turbulent kinetic energy, turbulent viscosity, vorticity and drop size distribution are investigated and compared for the different computation cases.

In addition, the HVO fuel and EN 590 fuel are added in to the OpenFOAM fuel libraries. The physical properties of the four investigated fuels are compared and their influence on the performance of the fuels in the spray simulations are investigated.

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