Heat release and heat flux in a spray-guided direct-injection gasoline engine
Heat flux measurement and pressure-based heat release analysis have been performed on a spray-guided direct-injection spark-ignition single-cylinder research engine. A two-dimensional model of the heat flux sensor has been used to calculate the heat flux from the measured surface temperature. The ef...
| Autores principales: | , , , |
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| Formato: | Journal article |
| Lenguaje: | English |
| Publicado: |
2007
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| Sumario: | Heat flux measurement and pressure-based heat release analysis have been performed on a spray-guided direct-injection spark-ignition single-cylinder research engine. A two-dimensional model of the heat flux sensor has been used to calculate the heat flux from the measured surface temperature. The effects of the ignition timing, air-fuel ratio, and mixture preparation on the engine heat flux and heat release have been investigated at a specific operating condition. An engine thermodynamic simulation code has been used to predict the gas-to-wall heat transfer using different heat transfer correlations. It was found that both the heat release rate and the heat flux are strongly influenced by ignition timing and air-fuel ratio. The results also show that late direct injection has a faster initial burn rate even compared with the plenum injection mode. The modelled heat transfer has been compared with the measured results and a modified Woschni correlation has been proposed. JAUTO586 © IMechE 2007. |
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