Title: Development of MGE 1.8T combustion system assisted by numerical simulation

Authors: Jun Xin; Ming Chen; Xi Xin; Xiaomao Zhang; Yang Yang; Zheng Xu

Addresses: SAIC Motor Passenger Vehicle Co., No. 201 Anyan Rd. Jiading, Shanghai, China ' SAIC Motor Passenger Vehicle Co., No. 201 Anyan Rd. Jiading, Shanghai, China ' SAIC Motor Passenger Vehicle Co., No. 201 Anyan Rd. Jiading, Shanghai, China ' SAIC Motor Passenger Vehicle Co., No. 201 Anyan Rd. Jiading, Shanghai, China ' SAIC Motor Passenger Vehicle Co., No. 201 Anyan Rd. Jiading, Shanghai, China ' SAIC Motor Passenger Vehicle Co., No. 201 Anyan Rd. Jiading, Shanghai, China

Abstract: This paper describes the CFD assisted combustion system development for a 1.8 L turbo GDI engine which has been developed by SAIC Motor. The combustion system is a direct injected turbocharged system employing centre-mounted multi-hole injectors. The in-cylinder charge motion, fuel injection, air/fuel mixing and combustion processes in the combustion system were evaluated. Proposed intake port options were numerically investigated and compared. Impingement of fuel droplets on piston crown, and wetting on the walls of combustion chamber and the subsequent impacts on mixture formation and oil dilution were investigated by both CFD tool and engine test approaches. Spray targeting was optimised to minimise oil dilution, and multiple fuel injection strategies were investigated to understand its impact on injection, mixture formation and combustion process. The concentrations of pollutants including CO, NO_x, HC and soot were simulated. The present simulation results agree well with the measurement data from engine testing, including cylinder gas pressure.

Keywords: combustion simulation; spray atomisation; wall wetting; oil dilution; pre-ignition; tumble flow; gasoline direct injection; petrol direct injection; turbo GDI engines; numerical simulation; CFD; computational fluid dynamics; turbocharging; charge motion; fuel injection; air-fuel mixing; fuel droplet impingement; mixture formation; oil dilution; carbon monoxide; carbon emissions; NOx emissions; nitrogen oxides; soot emissions; hydrocarbon emissions; cylinder gas pressure.

DOI: 10.1504/IJPT.2017.082885

International Journal of Powertrains, 2017 Vol.6 No.1, pp.23 - 48

Received: 08 Jun 2015
Accepted: 07 Aug 2015
Published online: 15 Mar 2017 *

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