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Istituto di ricerche sulla combustione
Soppresso il 01/10/2020

Torna all'elenco Contributi in rivista anno 2020

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Particle emissions from a HD SI gas engine fueled with LPG and CNG

Anno di pubblicazione: 2020

Formato: Elettronico

Autori: Napolitano, Pierpaolo; Alfe, Michela; Guido, Chiara; Gargiulo, Valentina; Fraioli, Valentina; Beatrice, Carlo

Affiliazioni autori: ---

Autori CNR:


Lingua: inglese

Abstract: An extensive experimental campaign was addressed to study the emissive behavior of a heavy-duty (HD) spark ignition (SI) gas engine fueled with LPG and CNG, mainly focusing on particle emissions analysis. The engine was tested in transient condition, along the World Harmonized Transient Cycle (WHTC), also analyzing the engine response in correspondence of cold- and hot-start WHTCs. Overall, for both CNG and LPG, regulated emissions are within the Euro VI homologation limits. The average particle size distribution function indicates that particles with diameters below 23 nm contribute to about 20% of total PN for both the fuels. The results reveal that the particles are emitted in the first part of tests, highlighting a correlation of soot and PN emissions with some specific phases of the test cycle, namely in correspondence to the passage from long engine idle periods to speed/load increments, in both cold- and hot-start WHTCs. No significant variation in the distribution of primary particles dimension is discernible in the particles sampled along the different WHTC versions, indicating that cold- and hot-start WHTCs negligible affect the formation of the nuclei cores at the early stage of the particles formation. The thermal reactivity of both LPG and CNG-derived soot is in line with typical engine particulate matter: the soot is completely burnt in the temperatures range between 550 and 680 degrees C and a moderately higher reactivity in case of soot from cold-start CNG tests was detected. Such difference was related to the larger presence of oxygen functional groups.

Lingua abstract: inglese

Pagine totali: 8


Fuel Butterworth Scientific,
Paese di pubblicazione: Regno Unito
Lingua: inglese
ISSN: 0016-2361

Numero volume: 269

Numero fascicolo: 117439

DOI: 10.1016/j.fuel.2020.117439

Referee: Sė: Internazionale

Stato della pubblicazione: Published version

Indicizzato da: ISI Web of Science (WOS) [000520021800074]

Parole chiave:

  • SI gas engine
  • LPG
  • CNG
  • Soot structure
  • PN and PSDF
  • WHTC driving cycle

Strutture CNR:

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