Vegetable oils such as alcohol, rape-seed oil, etc., are well-known as alternative fuels in the near future. But they have low performance, especially long ignition delay and low calorific value, for use as a fuel of diesel engines. So we tried to improve better performance by mixing with petroleum. This report shows the application availability of the Laser speckle interferometry to the fixed combustion chamber in the former, and the ignition difference about each fuel's droplet by use of this interferometry in the latter. The performance analysis was something made clear, but the specification of temperature field in each combustion process was not clear by the disturbance of ignition ray, smoke and soot.
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