Measurements and Calculations of the Two-Dimensional Flow Field in a Motored Engine with a Prechamber

概要

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To obtain a better understanding of flow field in a motored engine with a horizontal prechamber, mean velocity and turbulence intensity of air flow in the main combustion chamber are measured with a laser Doppler velocimeter while changing the torch nozzle area size. On the other hand, distributions and time-histories of the mean velocity in both pre- and main chambers are calculated numerically by using a two-dimensional flow model. As a consequence, the measured mean velocity and its turbulence are found to be influenced considerably by the torch jet flow or torch nozzle area. The computed velocity vector diagrams are very similar in its pattern to the velocity vector diagrams visualized by a tuft technique. Distribution and time-history diagrams of mean velocity calculated in the main chamber are also in reasonable agreement with the measured ones, only within small crank angle range from the top dead center (TDC) where the two-dimensionality in the flow field is enough to be remained.
東海大学の論文