EXPERIMENTAL CHARACTERIZATION OF INTERNAL NOZZLE FLOW AND DIESEL SPRAY BEHAVIOR. PART I: NONEVAPORATIVE CONDITIONS

• DOI: 10.1615/atomizspr.v15.i5.20
• Publication Date: 2005-07-11T11:03:42Z
• Authors: J. M. Desantes; R. Payri; J. M. Pastor; J. Gimeno
• Keywords: Spray characteristics; Discharge coefficient; Internal flow

This and the accompanying article present an experimental study of diesel sprays under current direct-injected engine operating conditions. In this (Part I) is focused on flow behavior inside nozzle, characteristics injected into a high-density gas at low temperature so that fuel evaporation avoided. A complete characterization has been performed for five different nozzles, with nominal hole diameter ranging from 115 to 200 μm, in injection conditions, order evidence influence nozzle geometry parameters major features, both downstream orifices. The methodology used work includes internal basis microscopic visualization silicone molds hydraulic measurement spray momentum, image processing. Combining these techniques makes it possible determine discharge, velocity, contraction coefficients, critical cavitating all which are necessary proper analysis process as well modeling purposes. Moreover, accurate determination coefficients have made determine, results, unique proportionality constant expression tip penetration derived dimensional rectangular rates, valid nozzles conditions evaluated. second publication II), will be analyzed same set article, making use results presented here. Liquid measured reacting nonreacting atmospheres dependence liquid length ambient by applying simple model hypothesis mixing limited vaporization.