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Investigation of Boundary Layer Behaviour in HCCI Combustion using Chemiluminescence Imaging

Författare

  • Håkan Persson
  • Leif Hildingsson
  • Anders Hultqvist
  • Bengt Johansson
  • Jochen Ruebel

Summary, in English

A five-cylinder diesel engine, converted to a single

cylinder operated optical engine is run in Homogeneous

Charge Compression Ignition (HCCI) mode. A blend of

iso-octane and n-heptane is used as fuel.



An experimental study of the horizontal boundary layer

between the main combustion and the non-reacting

surface of the combustion chamber is conducted as a

function of speed, load, swirl and injection strategy. The

combustion behaviour is monitored by

chemiluminescence measurements.



For all cases an interval from -10 to 16 crank angles

after top dead center (CAD ATDC) in steps of one CAD

are studied. One image-intensified camera observes the

boundary layer up close from the side through a quartz

cylinder liner while a second camera has a more global

view from below to see more large scale structure of the

combustion.



The averaged chemiluminescence intensity from the

HCCI combustion is seen to scale well with the rate of

heat release. A boundary layer is defined and studied in

detail between the main combustion volume and the

piston crown surface as a function of crank angle. The

boundary layer is found to be in the range from 2 to 4

mm for all cases by the definition used; however, the

location for the measurements becomes more and more

important as combustion becomes more

inhomogeneous. To get accurate calculations, the level

of noise must also be considered and definitions of

boundary layer thickness should not be made at to low

chemiluminescence intensity.

Publiceringsår

2005

Språk

Engelska

Sidor

1358-1369

Publikation/Tidskrift/Serie

SAE Transactions, Journal of Fuels and Lubricants

Volym

114

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Society of Automotive Engineers

Ämne

  • Other Mechanical Engineering

Nyckelord

  • Heat Release
  • Boundary Layer
  • Chemiluminescence
  • Engine
  • Combustion
  • HCCI

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0096-736X