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Wall Heat Flux on Impinging Diesel Spray Flame: Effect of Hole Size and Rail Pressure at Similar Injection Rate Condition
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 30, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The fuel economy of recent small size DI diesel engines has become more and more efficient. However, heat loss is still one of the major factors contributing to a substantial amount of energy loss in engines. In order to a full understanding of the heat loss mechanism from combustion gas to cylinder wall, the effect of hole size and rail pressure at similar injection rate condition on transient heat flux to the wall were investigated. Using a constant volume vessel with a fixed impingement wall, the study measured the surface heat flux of the wall at the locations of spray flame impingement using three thin-film thermocouple heat-flux sensors. The results showed that the transferred heat was similar under similar injection rate profiles. However, in case of flame luminosity, temperature distribution, characteristic of local heat flux and soot distribution was also similar except the smaller nozzle hole size with higher injection pressure. Moreover, we confirmed that the relation between Nusselt number and Reynolds number is a useful measure for describing the heat transfer phenomena in diesel combustion.
CitationMahmud, R., Kurisu, T., Ilminnafik, N., Nishida, K. et al., "Wall Heat Flux on Impinging Diesel Spray Flame: Effect of Hole Size and Rail Pressure at Similar Injection Rate Condition," SAE Technical Paper 2020-32-2313, 2020.
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