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Optical Characterization of Methanol Sprays and Mixture Formation in a Compression-Ignition Heavy-Duty Engine Lund University
- Format:
- Book
- Conference/Event
- Author/Creator:
- Matamis, Alexios, 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:
- Despite heavy criticism in recent years over their emissions, Compression-Ignition engines still offer the highest overall efficiency among internal combustion engine (ICE) concepts. In conventional Diesel-combustion, HC and CO emissions are kept low due to high fuel conversion efficiency while high NOx and PM is formed. However, previous studies have shown that with the use of alcohol fuels the emission profile becomes significantly different. As a result of lower adiabatic flame temperature and the extra oxygen that the fuel brings into the combustion chamber, low NOx and insignificant PM emissions are achieved simultaneously. This offers a unique case where high engine efficiency can be maintained while significantly reducing emissions at the same time. Methanol being the smallest and simplest molecule among the alcohols can be produced renewably from a variety of feedstocks which, unlike ethanol, do not compete with the food supply chain. In this study we investigate the spray characteristics of methanol and the mixture formation inside the optically accessible cylinder of a DI-HD engine. A wide range of SOI timings is tested in addition to three rail pressures for a single operating condition and finally, the spray properties of methanol are compared to PRF81 for two SOI's demonstrating a strong dependence on ambient conditions. A high speed camera captures the behaviour of the liquid part of the spray which is visualised via Mie-scattering of the liquid droplets. Cone angle and liquid length variations are reported throughout each injection and for 50 cycles. In addition, fuel-tracer Laser-Induced Fluorescence is used to visualise the fuel distribution and the stratification level is assessed within the combustion chamber at various timings throughout the compression stroke
- Notes:
- Vendor supplied data
- Publisher Number:
- 2020-01-2109
- Access Restriction:
- Restricted for use by site license
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