Experimental investigation to analyze the effect of induction length of diesel-acetylene dual fuel engine

Many scientists have utilized acetylene as a renewable fuel in the dual-fuel engine without considering the significance of induction length. This paper aims to study and analyze the effect of induction length for acetylene fueled CI engine. In this present study, the author has conducted an experimental investigation on a modified diesel engine in which acetylene is being inducted at different induction length of 25 cm, 50 cm, 75 cm and 100 cm away from the cylinder head. The results show that when acetylene is introduced with a constant flow rate of 1 LPM at 50 cm induction length, BTE is marginally lesser than neat diesel by 0.8%. BSEC increases during acetylene induction under lower loads due to the higher flame velocity of acetylene and minimum value i.e. 10.8 MJ/kWh is observed at full load when induction length is 50 cm for DFE. EGT is slightly lower than diesel for entire loading conditions for acetylene DFE. From the several trials which were conducted, the highest obtained value of peak cylinder pressure is 77.34 bar and the HRR is 51.9 J/degrees CA when the fuel is inducted at 50 cm. Moreover, CO value is 0.0087%, and HC is 0.024 g/kWh for 50 cm induction length, which is also lower than baseline diesel at full load. However, there is a slight increase in oxides of nitrogen at peak loads, which may be due to the higher combustion temperature. Overall, it can be concluded that the optimum length for acetylene induction is 50 cm.