Cycle-resolved Evaluation of Directly Injected Methane using a High-Speed Laser-induced Fluorescence Measurement System Universität Bayreuth

Format:

Book

Conference/Event

Author/Creator:

Geiger, Mirko, author.

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:

Cycle-resolved evaluation of directly injected methane using a high-speed LIF systemWhile emission regulations and new certification procedures become more and more stringent, the demands to reduce pollutants increase in the field of engine research and development. One approach to meet those new emission limits is to use alternative fuels inside internal combustion engines. Methane as a main component of natural gas has the potential to reduce CO2-emissions due to its better C to H ratio compared to conventional gasoline while allowing higher compression ratios and a lower combustion temperature. In order to rate various alternative fuels and their impact on further improvements, a detailed knowledge about the ongoing processes inside the engine during different operation modes is of major importance. Especially the injection and mixture formation phases inside the combustion chamber are crucial for the performance and efficiency as well as the formation of pollutants during the combustion process. In this study, evaluations of the injection and mixture formation of directly injected methane inside a modified single cylinder research engine are carried out. Equipped with optical accesses, the engine allows cycle-resolved two-dimensional measurements of the air-fuel equivalence ratio (λ) using a highly repetitive laser-induced fluorescence system. The applied principle of laser induced fluorescence enables the visualization of gaseous fuel inside the cylinder as the λ-distribution is displayed quantitatively. Using a modified HDEV 4 injector for gaseous fuels, a comparison is made between different injection timings, injection pressures as well as engine speeds. Adapting the measurement system for cycle-resolved evaluations by developing a corresponding control routine allows to a gain better understanding of the variations amongst different engine cycles

Notes:

Vendor supplied data

Publisher Number:

2020-01-2106

Access Restriction:

Restricted for use by site license