Temperature measurement in the swirl chamber of an IDI engine using Moire deflectometry

The processes of ignition and combustion of a diesel engine are affected by temperature distribution formed during compression stroke. We present an a pplied study on the measurement of temperature distribution in the swirl ch amber of an IDI engine using the Moire deflection technique. The method for determining the quantitative temperature distribution from detected Moire fringe shift has been established. From the measured temperature distributi on, the evaporation and air mixing processes in the swirl chamber during co mpression stroke is analysed and discussed. The temperatures mapped by Moir e deflectometry are compared and validated with the temperatures measured b y hot-wire anemometry at several representative points. The experimental in vestigation opens up a new means for measuring the temperature distribution in the combustion chamber of IC engines. (C) 1998 Elsevier Science Ltd. Al l rights reserved.