Two-Color Infrared Digital Imaging for Determination of In-Cylinder Temperature and Species during Compression and Combustion Periods of DI Diesel Engine

In order to determine the spatial and temporal distributions of temperature and species in a DI diesel engine combustion chamber, development of a new high-speed two-color infrared IR digital data system has been conducted. Among the other performed experimental work tasks is the modification of the engine cylinder head in order to accommodate a new optical access assembly. In an attempt to compare the measurement from this work with predictions made by computational method, the KIVA II code has been placed according to our engine specifications. New analytical radiation heat transfer computer programs were developed to evaluate our IR system performance. Upon completion of the detailed design, the key system components of the IR apparatus have been fabricated and tested, including optical elements and the new electronic packages. At present the mechanical parts composing the assembly are under construction. Our test of the new optical access installed in the engine apparatus exhibits satisfactory results. Preliminary measurements will be obtained soon. We are in the process of compiling some computational results from the KIVA II operation. According to our results to date, due to many limitations with the code, it appears to be difficult to achieve a realistic evaluation of those results using our measurements from the present experiment. Analysis of our IR system performance using newly developed computer programs suggests that the background radiations e.g. from the cylinder wall may not be significant to affect the accuracy of measurements from the gaseous mixtures.