The Study of Impact of Compression Ratio on the Performance and Emission Characteristics of DTSi Engine using Petrol and CNG as Fuel

Abstract

The digital twin spark ignition (DTSi) system is one of the most effective method used in SI engine in recent years. At present scenario, CNG is considered as one of the best alternate fuel for SI engine. It is a well-known fact that efficiency of SI engines mainly depends on the compression ratio (CR). The main purpose of the study is to find the effect of compression ratio (CR) on the performance and emission characteristics of four strokeDTSi engine  using petrol and CNG as fuel. Theengine is tested with three CR that is 9, 9.5 and 10. For petrol,CR of 9.5 have shown better thermal efficiency, brake specific fuel consumption and volumetric efficiency, alsolowercarbon monoxide (CO) and unburnt hydrocarbon (HC) emission. It is seen that oxides of nitrogen (NO_X) emission found maximum for CR of 9.5 compared to other two CR. The CR of 10 resulted in better performance and lower emission when CNG is used as fuel with slight increase in NO_X emission.