Temperature of Combustion Chamber and Rate of Heat Release of Diesel Engine Using Rape-Seed Oil as Fuel

Abstract

In order to discuss the combustion of rape-seed oil in combustion chamber, this paper dealed with polytropic change, temperature of combustion chamber and rate of heat release. The maximum combustion pressure and the amount of piston-rings abrasion were also measured.
The obtained results were as follows:
1. Index number of polytropic change using rape-seed oil under rated horsepower operation at compression stroke was equal to 1.33, and for the light oil it was equal to 1.33.
2. The changes of temperature in combustion chamber obtained from indicator diagram. The combustion temperature using rape-seed oil at 50 to 80% of cylinder volume under expansion stroke was lower than that of light oil and therefore the exhaust temperature using rape-seed oil was lower than light oil.
3. From the calculation of the rate of heat release, the combustion of rape-seed oil was superior to light oil.
4. In the analysis of variance of the maximum combustion pressure, the variation of the peak value using rape-seed oil was smaller than that of light oil.
5. The amount of piston-rings abrasion using rape-seed oil (as fuel) was smaller in quantity than that of using light oil.