Reducing the pollution of internal combustion engines is a very important problem that can be solved in various ways. However, the acoustic agglomeration method is not used in diesel engines. The study used a 1.9 TDI diesel internal combustion engine supplied with a mixture of diesel (D100) and a 90% of rapeseed methyl ester - 10% propanol fuel mixture (ROMEP). The study also changed the position of the exhaust gas recirculation (EGR) valve by adjusting the 20% EGR throughput limits and maintaining a constant engine load of 90 Nm. It should be noted that the use of biofuels produces less particulate matter, which reinforces the relevance of this study. Measurements were performed using Measurement System: The Testo 380 fine particle analyzer system was used to determine the mass concentration, and a six-channel Fluke 985 particle counter with an isokinetic sampling probe was used to determine the fractional numerical concentration of the particulates. Six particle size distribution regimes in the size range of 0.3 to 10 μm were observed, controlling the transmittance of the EGR system by 20%. The direction of the sound pressure throughout the flow and the excitation frequency 21400 Hz and 33800 Hz were also investigated and compared with the results without agglomeration. The article examines the possibility of using the developed acoustic chamber in the exhaust systems of various objects that uses diesel or various alternative fuel mixtures as fuel. The acoustic field reduces the number of particles by up to 92.5% for 10 μm and up to 44.5% for 0.3 μm at an excitation frequency of 21400 Hz.
Keywords: Acoustic agglomeration; Engine exhaust; Fractional numerical concentration of particulates; ROMEP fuel Mixture.
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