Effect of compression ratio, nozzle opening pressure, engine load, and butanol addition on nanoparticle emissions from a non-road diesel engine

Abstract

Currently,dieselenginesaremorepreferredovergasolineenginesduetotheirhighertorqueoutputandfueleconomy.However, dieselenginesconfrontmajorchallengeofmeetingthefuturestringentemissionnorms(especiallysootparticleemissions)while maintainingthesamefueleconomy.Inthisstudy,nanosizerangesootparticleemissioncharacteristicsofastationary(non-road) diesel engine have been experimentally investigated. Experiments are conducted at a constant speed of 1500 rpm for three compression ratios and nozzle opening pressures at different engine loads. In-cylinder pressure history for 2000 consecutive engine cycles is recorded and averaged data is used for analysis of combustion characteristics. An electrical mobility-based fast particlesizerisusedforanalyzingparticlesizeandmassdistributionsofengineexhaustparticlesatdifferenttestconditions.Soot particledistributionfrom5to1000nmwasrecorded.Resultsshowthattotalparticleconcentrationdecreaseswithanincreasein engine operating loads. Moreover, the addition of butanol in the diesel fuel leads to the reduction in soot particle concentration. Regression analysis was also conducted to derive a correlation between combustion parameters and particle number emissions for different compression ratios. Regression analysis shows a strong correlation between cylinder pressure-based combustion parameters and particle number emission.