Study of Impact of CNG Flow Rate and Speed on the Performance and Emission Characteristics of DTSI Engine Using Petrol-ethanol Fuel Blend


Krishna Prasad S†, R Saravanan‡


† Department of Mechanical Engg, Research Scholar, UVCE Bangalore and NMAM Institute of Technology, Nitte.
‡ Associate professor, Department of Mechanical Engg, UVCE Bangalore.

Corresponding Author Email: kprao@nitte.edu.in

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The main purpose of the work is to check the effect of addition of CNG as pilot fuel and engine speed on the performance and emission characteristics of four stroke DTSi using the petrol-ethanol fuel blends. The engine was teste with three speeds of 1750 rpm, 2000 rpm and 2250 rpm. CNG as a pilot fuel was introduced with incoming air with flowrates of 0.05 kg/hr., 0.1 kg/hr., 0.5kg/hr. and 0.2 kg/hr. Combination of petrol and ethanol were E5, E10, E15, E20, E25 and E30. It is been observed that, the increase flowrate of CNG with increase in ethanol percentage improves the brake thermal efficiency (BTE) and reduces the Carbon monoxide (CO) and hydrocarbons (HC) except Oxides of nitrogen (NOX) emission with all speeds. BTE found better for E25 with CNG flow rate 0.15 kg/hr with reduced CO and HC emission with slight increase in NOX emission at a speed of 2000 rpm (1,21). Further increase in CNG flow rate and ethanol percentage resulted in reduces BTE with increased CO and HC emission in all three speeds.