Experimental and Numerical Characterization of High-Pressure Methane Jets for Direct Injection in Internal Combustion Engines Istituto Motori - CNR

Format:

Book

Conference/Event

Author/Creator:

Montanaro, Alessandro, author.

Contributor:

Allocca, Luigi

De Vita, Angelo

Duronio, Francesco

Meccariello, Giovanni

Ranieri, Stefano

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:

Compressed Natural Gas (CNG) is regarded as the most promising alternative fuel for spark-ignited (SI), internal combustion (IC) engines to improve engine thermal efficiency and reduce both carbon dioxide and pollutant emissions. Significant advantages of CNG are a higher octane number, higher hydrogen to carbon ratio, and lower energy-specific CO2 emissions compared with gasoline. More, it can be produced in renewable ways, and is more widespread and cheaper than conventional liquid fossil fuels. In this regard, the direct injection of CNG engines can be considered a promising technology for highly efficient and low-emission future engines.This work reports an experimental and numerical characterization of high-pressure methane jets from a multi-hole injector for direct injection engines. The tests were performed in a constant volume (CV) combustion chamber under a wide range of operative conditions in terms of injection pressure (from 10 to 50 bar), ambient density (up to 12 kg/m3), and ambient temperature (room and 200°C). Schlieren imaging technique was employed to evaluate the effects of the injection pressure and chamber thermodynamic conditions on jet macroscopic characteristics.Then, the overall injection process was reconstructed with a numerical CFD model featuring a large eddy simulation (LES) turbulence framework. The simulation reproduced the jet's transient evolution and captured the classical structures of under-expanded jets. Such model allowed to evaluate further parameters, not available from the experimental characterization, that provided a better knowledge of the air-fuel mixing process

Notes:

Vendor supplied data

Publisher Number:

2020-01-2124

Access Restriction:

Restricted for use by site license