Particles emitted from internal combustion engines have adverse health effects. The severity varies based on the particle size as they deposit at different parts in the respiratory system. After-treatment systems are employed to control the particle emissions from combustion engines. The design of the after-treatment system depends on the nature of particle size distribution at the upstream and is important to evaluate. In heavy-duty (HD) diesel engines, the turbocharger turbine is an important component affecting the flow and particles. The turbine wheel and housing influence particle number and size could potentially be used in reducing particle number or changing the distribution to become more favourable for filtration. This work evaluates the effect of HD diesel engine’s turbine on non-volatile particle number and size distribution. The particle number (PN) emissions is measured with regard to (i) the temperature at the turbine inlet (200°C, 300°C and 400°C), (ii) the exhaust mass flow rate and (185 g/s, 210 g/s and 225 g/s) (iii) the particle concentration at the turbine inlet (by varying fuel injection pressures: 800 bar, 1000 bar and 1200 bar). It was found that at temperatures of 200°C, PN remains almost constant as they were held together by the volatile components. However, at 300°C there was an increase in PN across the turbine, and the increase was higher at higher mass flow rates across the turbine. Furthermore, lower injection pressures exhibited a higher rise in PN. Interestingly, at 400°C, a reduction in PN across the turbine was observed due to oxidation. This reduction in PN reduced with an increase in mass flow rate. Additionally, with higher injection pressures, a higher reduction in PN was noticed. This result is promising as catalyst coated turbine wheels could potentially enhance this effect thereby reducing PN before the after-treatment system.
|Book series||S A E Technical Papers|
|Publication status||Accepted/In press - 2020|
|Event||Powertrains, Fuels & Lubricants Meeting 2020 - Virtual event, Krakow, Poland|
Duration: 22 Sep 2020 → 24 Sep 2020
|Conference||Powertrains, Fuels & Lubricants Meeting 2020|
|Period||22/09/2020 → 24/09/2020|