Impact of Multiple Injection Strategies on Efficiency and Combustion Characteristics in an Optical PPC Engine

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceeding

Abstract

Partially premixed combustion (PPC) is a promising way to achieve high thermal efficiency and low emissions, especially by using multiple injection strategies. The mechanisms behind PPC efficiency are still to be explained and explored. In this paper, multiple injections have been used to affect the gross indicated efficiency in an optical PPC engine modified from a Volvo MD13 heavy-duty diesel engine. The aim is both to improve and impair the gross indicated efficiency to understand the differences. The combustion natural luminosity is captured by a high-speed camera, and the distribution of fuel, oxygen, and temperature during the combustion process has been further explored by CFD simulation. The results show that with the right combination of the pilot, main, and post injection the gross indicated efficiency can be improved. Using a post injection in a triple-injection case show to have less effect on the combustion phasing than pilot injection in a double-injection case, while it can significantly affect combustion efficiency. The later of the double-injection cases tested (c30/16), has less heat transfer losses since the high-temperature region transported away from the cylinder head and piston bowl wall, which can be seen in the CFD-simulations. The highest gross indicated efficiency among the tested cases is given by the triple-injection case d38/24/6 as it reaches the best balance between the mixing and the local temperature through the jet-jet interactions and combustion-jet interactions.

Detaljer

Författare
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Energiteknik
  • Strömningsmekanik och akustik
Originalspråkengelska
Titel på värdpublikationWCX SAE World Congress Experience
FörlagSociety of Automotive Engineers
StatusPublished - 2020 apr 14
PublikationskategoriForskning
Peer review utfördJa
EvenemangSAE 2020 World Congress Experience, WCX 2020 - Detroit, USA
Varaktighet: 2020 apr 212020 apr 23

Publikationsserier

NamnSAE Technical Papers
FörlagSociety of Automotive Engineers
ISSN (tryckt)0148-7191

Konferens

KonferensSAE 2020 World Congress Experience, WCX 2020
LandUSA
OrtDetroit
Period2020/04/212020/04/23