Measurements of Ultrafine Particle Number Emissions from a Light-Duty Diesel Engine Using SMPS, DMS, ELPI and EEPS

2005 ◽  
Author(s):  
L. Rubino ◽  
Paul R. Phillips ◽  
Martyn V. Twigg
Keyword(s):  
Diesel Engine ◽  
Particle Number ◽  
Ultrafine Particle ◽  
Light Duty

Experimental investigation on the effect of injector hole number on engine performance and particle number emissions in a light-duty diesel engine

2020 ◽  
pp. 146808742093460
Author(s):  
Khawar Mohiuddin ◽  
Heesun Kwon ◽  
Minhoo Choi ◽  
Sungwook Park
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Particle Number ◽  
High Loading ◽  
Cylinder Pressure ◽  
Light Duty ◽  
Combustion Duration ◽  
Hole Number

Particle number emissions need to be monitored and controlled in order to comply with the latest emission legislations for gasoline and diesel engines. This research focuses on performance and emission analysis of a light-duty diesel engine with various injector hole numbers. A 500cc single-cylinder diesel engine was used for this purpose, and injectors with hole numbers varying from 7 to 10 were analyzed. Different operating conditions were selected to test the engine at all types of loading conditions. Start of injection and exhaust gas recirculation swings were carried out at all the test cases to see the variation of particle number and other emissions. Increasing injector hole number from 7 to 9, in-cylinder pressure heat release rate and combustion duration increased while ignition delay was shortened. Soot-NOx and ISFC-NOx trade-offs also improved with decreasing hole diameter for these hole numbers. Particle number emissions reduced significantly with increasing hole number. However, the 10-hole injector exhibited a different behavior than the other injectors. For low loading case, cylinder pressure and heat release rate were higher than those of the 9-hole injector but for medium and high loading cases, in-cylinder pressure, heat release rate, and combustion duration of the 10-hole injector were found to be lesser than the 9-hole injector. For medium and high loading cases, particle number emissions from the 10-hole nozzle also increased as compared to the 9-hole injector. Optical engine investigation revealed a higher flame-flame interference in case of the 10-hole injector which resulted in degraded combustion performance and higher particle number emissions.

scholarly journals Particle number emissions from a light-duty diesel engine with biodiesel fuels under transient-state operating conditions

2014 ◽  
Vol 113 ◽  
pp. 22-31 ◽  
Author(s):  
Pi-qiang Tan ◽  
Shuai-shuai Ruan ◽  
Zhi-yuan Hu ◽  
Di-ming Lou ◽  
Hu Li
Keyword(s):  
Diesel Engine ◽  
Particle Number ◽  
Transient State ◽  
Operating Conditions ◽  
Light Duty ◽  
Biodiesel Fuels

scholarly journals Impact on Ultrafine Particles Concentration and Turbulent Fluxes of SARS-CoV-2 Lockdown in a Suburban Area in Italy

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 407
Author(s):  
Antonio Donateo ◽  
Adelaide Dinoi ◽  
Gianluca Pappaccogli
Keyword(s):  
Ultrafine Particles ◽  
Particle Number ◽  
Ultrafine Particle ◽  
Turbulent Fluxes ◽  
Number Concentration ◽  
Suburban Area ◽  
Observation Site ◽  
Meteorological Forcing ◽  
Restrictive Measures ◽  
Measurement Area

In order to slow the spread of SARS-CoV-2, governments have implemented several restrictive measures (lockdown, stay-in-place, and quarantine policies). These provisions have drastically changed the routines of residents, altering environmental conditions in the affected areas. In this context, our work analyzes the effects of the reduced emissions during the COVID-19 period on the ultrafine particles number concentration and their turbulent fluxes in a suburban area. COVID-19 restrictions did not significantly reduce anthropogenic related PM10 and PM2.5 levels, with an equal decrement of about 14%. The ultrafine particle number concentration during the lockdown period decreased by 64% in our measurement area, essentially due to the lower traffic activity. The effect of the restriction measures and the reduction of vehicles traffic was predominant in reducing concentration rather than meteorological forcing. During the lockdown in 2020, a decrease of 61% in ultrafine particle positive fluxes can be observed. At the same time, negative fluxes decreased by 59% and our observation site behaved, essentially, as a sink of ultrafine particles. Due to this behavior, we can conclude that the principal particle sources during the lockdown were far away from the measurement site.

Utilizing FAME as a Cetane Number Improver for a Light-duty Diesel Engine

2014 ◽  
Author(s):  
XiaoDan Cui ◽  
Peng Lu ◽  
Hiroki Nakamura ◽  
Mitsuhiro Matsunaga ◽  
Akira Kikusato ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Cetane Number ◽  
Light Duty
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