International Journal of Engineering and Technology

In the present study, a variable compression single cylinder diesel engine was used to study the effects of oxygen enrichment on the performance of engine at different compression ratios (C.R.) from 16.5 to 19.5 at different loads and compared to the amount of additional oxygen in four different rates from 1L/min to 4L/min. Oxygen cylinders were connected to intake manifold with throttle valve to supply additional oxygen. Enrichment of oxygen favours combustion in many performance parameters so the tests were carried out for the brake power (B.P.), Mean effective pressure, (Pmef), specific fuel consumption (S.F.C.), Mechanical efficiency (?mecheff) and exhaust gas temperature (E.G.T.). The purpose of this study is to deal with the major technological characteristic of enriched oxygen used in variable compression ratio single cylinder diesel engine for best possible values of secure engine limits. The test results show that the combustion performances were enhanced as there was increase in B.P., Pmef and decrease in S.F.C. and increase in rate of oxygen in intake air increases the charge burning rates and flame combustibility resulting higher exhaust gas temperature. Overall mechanical efficiency in lower compression ratio was high but for higher compression ratios there was a drop in mechanical efficiency.