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In this current study, the author has conducted an experimental investigation on the acetylene dual fuel CI engine at different mass flow rates of LPM (2, 4, 6 and 8) in CI engine. The performance, emission and combustion characteristics of the acetylene dual-fuel engine (DFE) at various loading conditions were evaluated and compared with that of baseline diesel. It was observed that when acetylene was inducted at 4 LPM, the modified CI engine has comparable BTE, i.e. 30.3%. CO, HC and smoke decrease by 17%, 24%, 27% and 32%, respectively, at peak loads for 4 LPM acetylene dual-fuel engine with a slight penalty of NO x  emission during the DFE mode. The consumption of diesel was reduced significantly by 26% at maximum load for 4 LPM. Overall, it can be concluded that the optimum flow rate of acetylene should be maintained at 4 LPM for effective utilisation of acetylene. Abbreviation:  BMEP: brake mean effective pressure; BSU: Bosch smoke unit; BTE: brake thermal efficiency; CI: compression-ignition; CO: carbon mono oxide; CO 2 : carbon dioxide; D: diesel; DFE: dual fuel engine; DFC: dual fuel combustion; DI: direct injection; EGT: exhaust gas temperature; HC: hydrocarbon; H: hydrogen; HRR: heat release rate; IC: internal combustion; ID: ignition delay; LPM: litres per minute; NO x : oxides of nitrogen; PPM: parts per million; VCR: variable compression ratio

Experimental studies to evaluate the combustion, performance and emission characteristics of acetylene fuelled CI engine