1985 Volume 47 Issue 3 Pages 273-277
When the sunflower oil was used as diesel engine fuel, the ignitability at low temperatures was much poorer than diesel oil. In order to find the cause, the behavior of the sunflower oil spray injected in the combustion chamber has analyzed in Part 1. In this paper, a combustion phenomenon of the fuel particles injected in the combustion chamber was theoretically analysed to investigate the engine startability.
The sunflower oil showed a ignition lag which is about 5.8 times longer than No. 2 diesel oil. Consequently if they were injected in the same combustion chamber under the same conditions, sunflower oil was more difficult to be ignited than No. 2 diesel oil. The chemical ignition lag was 1.2 times longer with sunflower oil than with No. 2 diesel oil, because of the difference of an activated energy. The physical ignition lag of sunflower oil was about 25 times longer than that of No. 2 diesel oil because of the larger size of the injected particle.
