Large Eddy Simulation Study of Biofuel Injection in an Optical Direct Injection Engine. Institute of Aerodynamics, RWTH Aachen

Format:

Book

Conference/Event

Author/Creator:

Berger, Sven, author.

Contributor:

Meinke, Matthias

Schröder, Wolfgang

Wegmann, Tim

Conference Name:

SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

The mixture quality in an internal combustion (IC) engine is a key element for clean combustion and high engine efficiency. In this submission, the fuel injection and mixture formation of ethanol and 2-Butanone is investigated and analyzed in a direct injection engine.The gas phase in the IC engine is predicted by a large eddy simulation (LES), while the fuel phase is modeled by Lagrangian particles using a primary breakup model for hollowcone-injectors, while the secondary spray break-up is predicted with a KH-RT model, in which either the O'Rourke or no-time-counter formulation are used to determine particle-particle collision. Wall interaction is taken into account and the non-linear Bellan-Harstad evaporation model is used. The gas phase simulation is based on a finite volume LES solver formulated for hierarchical Cartesian grids, in which the immersed moving-boundaries are resolved using a multiple level-set/cut-cell approach. Characteristic boundary conditions are used to avoid artificial reflections at the inlet and outlet portraits About 100 million mesh points are used to resolve the in-cylinder flow domain and dynamic load-balancing is utilized to redistribute the changing workload due to grid adaptation, moving valves and piston as well as fuel droplets.The validation of the spray model is performed by comparing the numerical findings to pressure chamber measurements and simulation results from the literature, which show good agreement for the spray penetration, vapor penetration, particle size distribution and local velocity. Measurements of the in-cylinder flow-field in an optical engine with an injection of ethanol using a hollow-cone injector are used to validate the simulation results in the IC engine. Simulations of the mixture formation are performed for ethanol and 2-Butanone. The spray penetration, cone angle as well as the distribution of the fuel at crank angles typical for ignition is compared for the two fuels

Notes:

Vendor supplied data

Publisher Number:

2020-01-2121

Access Restriction:

Restricted for use by site license