Heat Transfer From Impinging Diesel Flames to the Combustion Chamber Wall

Abstract

<div class="htmlview paragraph">The local heat fluxes from impinging combusting and evaporating diesel sprays to the wall of a square combustion chamber were measured in a rapid compression machine. It was revealed that the ratio of local heat flux between the combusting and evaporating spray, <i>q̇<sub>c</sub>/q̇<sub>e</sub></i>, is of the same order of magnitude as (T<sub>c</sub>-T<sub>w</sub>)/(T<sub>e</sub>-T<sub>w</sub>) and its values estimated by a two-zone model agree roughly with the measured ones. The time-mean local heat flux during the spray impingement was found to be approximately proportional to the 0.8th power of the injection velocity and the heat-transfer phenomenon depends largely on whether the ignition starts before or after the impingement.</div>