The Effects of Hot Air Dilution and an Evaporation Tube (ET) on the Particulate Matter Emissions from a Spray Guided Direct Injection Spark Ignition Engine University of Oxford

Format:

Conference/Event

Author/Creator:

Xu, Xu, author.

Contributor:

Stone, Richard

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The emission of nanoparticles from combustion engines has beenshown to have a poorly understood impact on the atmosphericenvironment and human health, and legislation tends to err on theside of caution. Researchers have shown that Gasoline DirectInjection (GDI) engines tend to emit large amounts of small-sizedparticles compared to diesel engines fitted with Diesel ParticulateFilters (DPFs). As a result, the particulate number emission levelof GDI engines means that they could face some challenges inmeeting the likely EU6 emissions requirement. This paper presentssize-resolved particle number emissions measurements from aspray-guided GDI engine and evaluates the performance of anEvaporation Tube (ET). The performance of an Evaporation Tube andhot air dilution system with a 7:1 dilution ratio has been studied,as the EU legislation uses these to exclude volatile particles.The Evaporation Tube was tested over a range of engine operatingconditions with a Spray-Guided Direct Injection engine. The resultsshow that at a temperature of 450°C, the Evaporation Tube had asignificantly greater reduction effect on nucleation mode particlescompared with accumulation mode particles. With a rich mixture andwithout dilution air, the transmission efficiency of large sizeparticles was reduced compared to the performance with astoichiometric mixture. With hot air dilution, the concentration ofnucleation mode particles also reduced to a very low level, and atthese conditions, the Evaporation Tube had a much smaller effect onthe remaining nucleation mode particles. There was also a slightreduction in HC emissions post Evaporation Tube even with richcombustion, especially with the addition of dilution air.The evaporation tube and hot air dilution were both found to beeffective in removing the nucleation mode. Unlike a thermo-denuderthere was no active charcoal for removing vaporized hydrocarbons,but with dilution of the sample after the evaporation tube or hotair dilution, there was no evidence of the nucleation modereforming. In addition it was found that using the accumulationmode defined by the Cambustion DMS500 was also effective atexcluding nucleation mode particles, as was a digital filter

Notes:

Vendor supplied data

Publisher Number:

2012-01-0436

Access Restriction:

Restricted for use by site license