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Influence of direct injection timing and mass of port injected gasoline on unregulated and nano-particle emissions from RCCI engine.
- Source :
-
Fuel . Dec2020, Vol. 282, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- • Presents effect of diesel SOI and PFI mass on the particle and unregulated emissions. • SOI timing, PMR, and α show a good correlation with particle number concentration. • Depicts parameters useful for prediction, control, and model development for particles. • Advanced SOI timing and increase in 'm g ' lead to increase the peak of NMP and AMP. nucleation and accumulation mode particles. • Unsaturated hydrocarbons emission increases with advanced diesel SOI timings. The study aims to experimentally characterize the nano-particle emissions and un-regulated (i.e., saturated and unsaturated hydrocarbons and formaldehyde emissions) emissions. Present study experimentally investigates the effect of high reactivity fuel injection timings and port-injected-fuel mass on nano-particle and unregulated emissions in the gasoline-diesel RCCI engine. Additionally, empirical correlations are developed using experimental data for the estimation of particle emission characteristics. An automotive single cylinder diesel engine is modified for an in-cylinder blending of port-injection of gasoline during suction stroke and direct-injection of diesel fuel during the compression stroke. The experiments are performed on a modified engine for various diesel injection timings and port-injected gasoline mass using development electronic control unit (ECU). Nano-particle and unregulated emissions are measured using electrical mobility based particle-sizer and Fourier-transform infrared spectroscopy analyser respectively. Combustion analysis is performed by in-cylinder pressure measurement. The experimental data of nano-particle and combustion characteristics are used for the development of empirical correlation using a multivariable regression technique for determining the particle number characteristics. The parameters - premixing ratio, start of injection of diesel, and a novel parameter defined as premixed fraction of total heat release are used for the development of empirical correlations and found a good correlation for estimating the nano-particle emission characteristics. Results also indicate that advanced direct injection timing and increase in the port-injected gasoline mass leads to higher particle emissions as well as saturated, unsaturated hydrocarbon and formaldehyde emissions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00162361
- Volume :
- 282
- Database :
- Academic Search Index
- Journal :
- Fuel
- Publication Type :
- Academic Journal
- Accession number :
- 146346097
- Full Text :
- https://doi.org/10.1016/j.fuel.2020.118815