A STUDY ON THE TIME AND SPACE RESOLVED MEASUREMENT OF FLAME TEMPERATURE AND SOOT CONCENTRATION IN A D.I. (DIRECT INJECTION) DIESEL ENGINE BY THE TWO-COLOR METHOD

Abstract

The two-color method for measuring the visible wavelength radiation from soot particles in flames was closely studied as a possible technique for measuring flame temperature and soot concentration in diesel engines. The accuracy of the temperature calibration of the measuring equipment was assured by a newly developed, high-temperature black-body furnace and a standard tungsten lamp. The emissivity of diesel flames, the most important value in this method, was investigated by the spectroscopic analysis of soot sampled from a diesel flame and by comparative measurements between the two-color method and the emission-absorption method. When the two-color method was applied to a direct injection diesel engine, the time and space resolved values of temperature and soot concentration were obtained for the first time.