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PIV Investigation of High Swirl Flow on Spray Structure and its Effect on Emissions in a Diesel-Like Environment Istituto Motori, CNR
- Format:
- Conference/Event
- Author/Creator:
- Valentino, Valentino, author.
- Conference Name:
- SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource
- Place of Publication:
- Warrendale, PA SAE International 2011
- Summary:
- The paper presents results of an experimental investigation ofthe fluid dynamic processes during the air/fuel mixture formationperiod between an evaporating diesel spray and swirl air flow underrealistic engine conditions. Particle Image Velocimetry (PIV)experiments have been carried out using an optically accessibleprototype 2-stroke diesel engine equipped with a swirled combustionchamber. The flow within the chamber assumes a well structuredswirl motion, similar to that developing in a real diesel engine,operating at high swirl ratio. The engine has been equipped with acommon rail injection system and a solenoid-controlled injector, inuse on automotive engines for the European market, able to managemultiple injection strategies. Two injector nozzles have beentested: a micro-sac 5-hole nozzle, 0.13 mm diameter, 150° sprayangle and a 7-hole, 0.141 mm diameter, 148° spray angle. Tests havebeen carried out for three injection strategies: two single at theinjection pressure of 100 and 120 MPa and a triple strategy at 71MPa, representing low load engine conditions.First, the air flow field was investigated, without fuelinjection, by applying the 2D Mie-scattering PIV techniqueestimating the velocity of fuel droplets tracers sprayed within thecombustion chamber and assumed to follow accurately the air flow.The air/fuel spray interaction has been also explored by the PIVtechnique to provide global information on the fuel jet evolution,in terms of liquid spray morphology, tip penetration and velocityvector distribution of the liquid fuel droplets within thecombustion chamber, under evaporating conditions. The behavior ofthe two nozzles and injection strategies on fuel droplets vectorvelocity distribution and gaseous engine out emissions has beenevaluated
- Notes:
- Vendor supplied data
- Publisher Number:
- 2011-01-1286
- Access Restriction:
- Restricted for use by site license
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