SOME MORE LIGHT ON DIESEL COMBUSTION

Abstract

<div class="section abstract"><div class="htmlview paragraph">This paper discusses the process of combustion, as revealed by high speed cinematography, in a small high speed diesel. Two direct injection types and one prechamber type were examined, and combustion sequences are shown. The phenomena are complex, but the main features are:</div><div class="htmlview paragraph"> <ol class="list nostyle"> <li class="list-item"> <span class="li-label">(1)</span> <div class="htmlview paragraph">In small engines much of the fuel strikes the chamber wall and moves along it.</div></li> <li class="list-item"> <span class="li-label">(2)</span> <div class="htmlview paragraph">Swirl is greater than has hitherto been supposed, squish much less.</div></li> <li class="list-item"> <span class="li-label">(3)</span> <div class="htmlview paragraph">Most of the flame is of the carbon-rich diffusion type.</div></li> <li class="list-item"> <span class="li-label">(4)</span> <div class="htmlview paragraph">Soot from very rich mixture is always formed at high loads, but can burn later leaving a clean exhaust.</div></li> <li class="list-item"> <span class="li-label">(5)</span> <div class="htmlview paragraph">Combustion knock does not seem to be related to the total fuel in the chamber on ignition, but rather to the amount of fast burning mixture present.</div></li></ol></div></div>