Application of High-Speed PIV Diagnostics for the Investigation of Flow Field and Spark Ignited Flame inside an Optical SI Engine

Paper #:
  • 2017-01-0656

Published:
  • 2017-03-28
Abstract:
The development of a premixed flame under realistic SI engine condition, with a particular focus on the relationship between in-cylinder flow field and flame propagation, was investigated for various engine flow conditions using optical diagnostics. Time-resolved simultaneous imaging of flow field and flame tomography was performed by developing and applying a high-speed Particle Image Velocimetry (HS-PIV) based technique in an optical SI engine. Optical filtering and adjustments were made to the HS-PIV setup to obtain the optimum signal-to-noise ratio for each operating conditions. The effect of both global and local flow field on flame propagation as well as combustion characteristics were studied by analysis of flow-field PIV results and derived flame properties. Early results suggest interesting interactions between turbulence and flame development, especially in terms of flame growth speed, propagation path and flow turbulence. Tumble centres were observed to be strongly affected under firing condition and the location as well as magnitude of tumble-induced flow and turbulence across the spark plug appear to be proportional to the combustion speed and flame propagation behaviour. Furthermore, the propagation of the flame creates high turbulent regions and induces faster flow near the flame front; this effect is greatly enhanced as the flame front move toward the squished region. The local turbulent intensity and flow velocity of the region near the flame front correlates well with the local flame growth speed.
Also in:
  • SAE International Journal of Engines - V126-3EJ
  • SAE International Journal of Engines - V126-3
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