Abstract
This paper presents a study on the feasibility of obtaining low temperature mixing-controlled combustion (mixing-controlled LTC) in a small HSDI engine with the objective of avoiding simultaneous NOx and soot formation. This mixing-controlled LTC strategy is based on reducing the equivalence ratio at the lift-off cross section and also the local combustion temperatures, but maintaining the conventional diesel spray structure. A parametric study has been carried out to evaluate the effects of in-cylinder gas density, temperature, and oxygen concentration on the characteristics of the mixing-controlled LTC characteristics. Low NOx and low soot mixing-controlled diesel combustion has been attained by combining low in-cylinder gas temperatures together with high air densities and low oxygen concentrations. However, the mixing-controlled LTC concept also presents an important drawback related to the engine efficiency deterioration.
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