An Analysis on Heat Loss of a Heavy-Duty Diesel Engine by Wall-Impinged Spray Flame Observation

Osada, Hideaki; Uchida, Nozomu; Zama, Yoshio

doi:10.4271/2015-01-1832

Cited by 9 publications

(1 citation statement)

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“…Similarly, the dominant factor of heat loss variation under injection pressure could be the α differences caused by the spray flame flow changes. 17 If the heat transfer coefficient at the non-combustion condition fully contributed to the total heat transfer in Figure 10, spray motion contributed 30%–40% for the total transferred heat under the combustion condition.…”

Section: Resultsmentioning

confidence: 98%

Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Mahmud

Kurisu

Nishida

et al. 2019

Advances in Mechanical Engineering

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Heat loss is one of the main causes of energy losses in modern direct injection diesel engines. This heat loss of the engine occurs during combustion, mainly due to the heat transfer between the impinging spray flame and the piston cavity wall. It is of more critical in small size engines. In order to decrease heat transfer, we need to examine the phenomenon of heat transfer through the combustion chamber walls more fully. To achieve this, we investigated the effects of flame impingement on transient heat flux to the wall. By using a constant volume vessel with a fixed impingement wall, the surface heat flux of the wall at the locations of spray flame impingement was measured with three thin film thermocouple heat flux sensors. The combined effect of impingement distance and injection pressure on the heat transfer was investigated parametrically. The results showed that an increase of injection pressure with longer impinging distance led to an increase in the heat transfer coefficient, which had a dominant effect on local heat flux compared with local temperature distribution. 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.

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Section: Resultsmentioning

confidence: 98%