Heat Transfer Measurements in the Intake Port of a Spark Ignition Engine

Paper #:
  • 960273

Published:
  • 1996-02-01
Citation:
Shayler, P., Colechin, M., and Scarisbrick, A., "Heat Transfer Measurements in the Intake Port of a Spark Ignition Engine," SAE Technical Paper 960273, 1996, https://doi.org/10.4271/960273.
Pages:
13
Abstract:
Surface-mounted heat flux sensors have been used in the intake port of a fuel injected, spark ignition engine to investigate heat transfer between the surface, the gas flows through the port, and fuel deposited in surface films. The engine is of a four valve per cylinder design, with a bifurcated intake port. For dry-port conditions heat transfer per cycle varies between 0 and 300 J/m2 depending on location, towards the surface at low temperatures and away from the surface at fully-warm conditions. Particular attention has been given to the changes in heat transfer rate associated with fuel deposition. Typically this is of the order of 5 kW/m2 in regions of heavy fuel deposition and varies by a factor of 2 over the period of an engine cycle. During warm-up, as coolant temperature increases from 0 to 90°C, changes in heat transfer associated with fuel deposition typically increase from 300 J/m2 to 1000 J/m2. For a given coolant temperature, heat transfer values generally increase as MAP is lowered or fuel flow rate increases. The effect of fuel deposition on heat transfer has been characterised by a function of MAP, fuel flow rate and coolant temperature.
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