超音波処理重油の農用エンジンへの適応性に関する研究 (第2報)

機関性能および噴射条件に伴なう処理燃料の特性

抄録

It is said that specific gravity, cetan number and viscosity of fuel have a close connection with out-put, starting performance, exhaust color and making of carbon flower. Treated heavy oils in ultrasonics were found to be much superior to untreated ones in out-put, specific fuel consumption and other performances when they were used for high speed diesel engine of precombustion chamber type (4PS/2, 000rpm).
1) Treated heavy oils were much superior to untreated heavy oils in maximum power. For example, the treated B heavy oil (LS) was higher about 8-10% than the untreated, and was nearly equal to light oil and Yanmar's heavy oil. It was found that treated heavy oils, compared with untreated ones, could burn perfectly up to higher load, as the result of analysis of exhaust gas.
2) Specific fuel consumption of treated heavy oils was 5-15g/PS-h less than untreated ones, but that of full load in heavy oil like B heavy oil (LS) was larger than that of 3/4 load and much larger in comparison with light oil and Yanmar's heavy oil.
8) We found that even treated B heavy oil (LS) could be used for high speed diesel engine (2, 000rpm) from out-put point of view. When specific fuel consumption was considered, there was more suitable revolution for this fuel. Accordingly, the suitable revolution will have to be pursued by experimentation.
4) When we considered synthetically combustion performance of out-put and specific fuel consumption and its limited condition of exhaust color and exhaust temperature, treated heavy oils were found to be much superior to untreated ones in cruising power.
5) The effect of injection timing and injection pressure on bad heavy oil was larger. For example, on B heavy oil (LS) the most suitable injection timing was synthetically 9-10°(B. T. D. C.) and injection pressure was 140-160kg/cm² as shown in Figs. 9 and 10.
6) When treated heavy oil was used for diesel engine, carbon flower was smaller in comparison with untreated on eas shown in Fig. 11-(1) (2).
7) Exhaust color became gradually dark with operating time, and its ratio with treared heavy oil was smaller than with untreated one as shown in Fig. 12.