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Flow and Temperature Distribution in an Experimental Engine: LES Studies and Thermographic Imaging

Författare

Summary, in English

Temperature stratification plays an important role in HCCI

combustion. The onsets of auto-ignition and combustion

duration are sensitive to the temperature field in the engine

cylinder. Numerical simulations of HCCI engine combustion

are affected by the use of wall boundary conditions,

especially the temperature condition at the cylinder and

piston walls. This paper reports on numerical studies and

experiments of the temperature field in an optical

experimental engine in motored run conditions aiming at

improved understanding of the evolution of temperature

stratification in the cylinder. The simulations were based on

Large-Eddy-Simulation approach which resolves the

unsteady energetic large eddy and large scale swirl and

tumble structures. Two dimensional temperature experiments

were carried out using laser induced phosphorescence with

thermographic phosphors seeded to the gas in the cylinder.

The results revealed different mechanisms for the

development of temperature stratification: intake gas and

residual gas mixing, heat transfer in the wall boundary layer,

compression of the charge, and large scale flow transport.

The sensitivity of LES results to different wall boundary

conditions and inflow conditions was analyzed.

Publiceringsår

2010

Språk

Engelska

Publikation/Tidskrift/Serie

SAE technical paper series

Dokumenttyp

Artikel i tidskrift

Förlag

Society of Automotive Engineers

Ämne

  • Other Mechanical Engineering

Nyckelord

  • Large Eddy Simulation
  • HCCI
  • CFD

Status

Published

Projekt

  • Competence Centre for Combustion Processes

ISBN/ISSN/Övrigt

  • ISSN: 0148-7191