Abstract
A transparent collimating cylinder (TCC) which is capable of schlieren observation through its cylindrical inner surface is reported. The outer surface was designed in such a way that it does not disperse parallel light rays both inside and outside the cylinder. Numerical simulation of light rays passing through the TCC revealed the required fabricating precision to obtain a viewing field of 95% of the cylinder diameter. Based on this simulation, a quartz TCC was fabricated and used for an engine cylinder to confirm its schlieren potential. High-speed schlieren images of the early stage of flame propagation and unburned gas motion were obtained with good clarity. Consequently, TCC proved to be a new effective tool for visualization studies of the internal combustion engine.
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