The effect of pre-injection fuel temperature upon the ignition delay and soot emission has been investigated on an i.d.i. engine running on diesel oil. Effects of evaporation in the engine cycle, at both subcritical and supercritical pressures, are discussed and attention focused on the probable attainment of the critical temperature by liquid droplets in certain ambient conditions. Stress is laid on the future need concurrently to optimize the injection equipment and the level of air swirl to realize the potential of fuel preheating.
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