Development of a Laboratory Automation System for Measuring the Characteristics of Transient Gas Jets

Abstract

The process of forming mixtures of intermittently injected fuel spray or jet and ambient air in the cylinder has significant effects on the ignition and combustion process in the direct injection engine. Instantaneous concentration measurements are necessary for obtaining the so-called time- and space-resolved concentration distribution in the jet. This distribution is needed to establish a model of diesel combustion. There has been little work in this field because of the difficulty of measuring the instantaneous concentration with sufficient statistical accuracy. Recently, we used the fast-response hot wire probe to measure the instantaneous concentration in a transient hydrogen jet [1]. In this way, we studied the mixing process of the transient gas jet together with the instantaneous concentration measurement and statistical analysis of the transient turbulent mixing process in the jet.