Soot emitted by combustion engines is a dangerous environmental pollutant and it must be kept as low as possible also to meet emission limit regulations. PM reduction strategies include reformulation / modification of existing fuels by the use of fuel additives. The principle goal of the present work is to isolate and comprehend the effect of fuel’s additives on particulate emission. During this study a self-designed burner has been implemented and optimized to obtain a laminar diesel flame. Subsequently, the combustion of pure diesel fuels and diesel fuels additised with different ether compounds (oxymethylene dimethyl ethers, OMEs, and tripropylene glycol methyl ether, TPGME), inserted in increasing concentration, has been investigated by optical methods, namely laser-induced incandescence (for evaluation of soot volume fraction), elastic light scattering (for the characterization of soot aggregate size) and two-color pyrometry (for temperature estimation). The optical diagnostics have been combined with a non-optical one, the scanning mobility particle sizer that was employed for particles diameter evaluation. The role of the additives during the soot formation process was investigated on the burner set-up and on spray flames generated in a constant volume combustion chamber (the latest was employed only for soot concentration analysis). The results found show that the production of soot (i.e. soot volume fraction) is inhibited by the addition of oxygenated additives, especially OME with longer molecular chain. The reduction of soot concentration observed, compared to the pure diesel, goes up to a maximum of 36% for the long chain OME-diesel blend and 27% for the TPGME-diesel blend, in the laminar flame conditions. This trend has been confirmed by the measurements on spray flames where the conditions are more similar to a realistic diesel engine. In this case the amount of soot produced by the diesel additised with the oxygenated species decreases up to 88% for OME-diesel blend and 84% for the TPGME-diesel ...
Laser-based investigation of the sooting combustion of additised diesel fuel ; Lasergestützte Untersuchung der rußenden Verbrennung von additiviertem Dieselkraftstoff
2021-01-01
Theses
Electronic Resource
English
DDC: | 629 |
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