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The authors carried out a basic and systematic investigation on diesel combustion processes using three different experimental apparatuses. This paper summarized the experimental results obtained from the three devices. Among the data contained in this paper are; (1) The structure and shape of diesel spray, the air movement around diesel spray and the spatial and temporal distributions of the size of droplets in diesel spray injected into the high pressure and room temperature charge. (2) The shape of diesel spray injected into the high pressure and high tempertaure charge. (3) The characteraistics of flame, and illumination delay, and ignition delay in the high pressure and high temperature charge.