The Modeling and Design of a Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine 2015-01-1970
Engine downsizing of the spark ignition gasoline engine is recognized as one of the most effective approaches to improve the fuel economy of a passenger car. However, further engine downsizing beyond 50% in a 4-stroke gasoline engine is limited by the occurrence of abnormal combustion events as well as much greater thermal and mechanical loads. In order to achieve aggressive engine downsizing, a boosted uniflow scavenged direct injection gasoline (BUSDIG) engine concept has been proposed and researched by means of CFD simulation and demonstration in a single cylinder engine.
In this paper, the intake port design on the in-cylinder flow field and gas exchange characteristics of the uniflow 2-stroke cycle was investigated by computational fluid dynamics (CFD). In particular, the port orientation on the in-cylinder swirl, the trapping efficiency, charging efficiency and scavenging efficiency was analyzed in details.
Following the CFD analysis, a single-cylinder uniflow 2-stroke research engine was commissioned and successfully operated with spark ignition combustion. The design of the engine is characterized with the compression ratio flexibility, intake port configuration flexibility, port/valve timing flexibility as well as the provision of optical access. The engine was used to carry out in-cylinder flow measurements by the PIV technique. The measured PIV results were then compared with the CFD outputs.
Citation: Ma, J. and Zhao, H., "The Modeling and Design of a Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine," SAE Technical Paper 2015-01-1970, 2015, https://doi.org/10.4271/2015-01-1970. Download Citation
Author(s):
Jun Ma, Hua Zhao
Affiliated:
Brunel Univ.
Pages: 14
Event:
JSAE/SAE 2015 International Powertrains, Fuels & Lubricants Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Single cylinder engines
Computational fluid dynamics
Downsizing
Fuel economy
Combustion and combustion processes
Simulation and modeling
Gasoline
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