This “conventional” diesel combustion is primarily mixing controlled with perhaps some premixed combustion that can occur due to mixing of fuel and air prior to ignition. This paper will review the most established combustion model for the conventional diesel engine. The application of laser-sheet imaging to the conventional diesel combustion process in the 1990s was key to greatly increasing the understanding of this process. For decades its complexity seemed to defy researchers’ attempts to unlock its many secrets despite the availability of modern tools such as high speed photography used in “transparent” engines, computational power of contemporary computers, and the many mathematical models designed to mimic combustion in diesel engines. The balance of fuel that had not participated in premixed combustion is consumed in the rate-controlled combustion phase.Ĭombustion in diesel engines is very complex and until the 1990s, its detailed mechanisms were not well understood. As the piston continues to move closer to top dead center, the mixture temperature reaches the fuel’s ignition temperature, causing ignition of some premixed quantity of fuel and air. During a phase known as ignition delay, the fuel spray atomizes into small droplets, vaporizes, and mixes with air. Abstract: In diesel engines, fuel is injected into the engine cylinder near the end of the compression stroke.
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