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Present work is focused on experimental investigation of performance, combustion and emission of DI diesel engine using Simarouba Oil Methyl Ester (SuOME). Control of combustion process in order to achieve better performance with reduced emission has been achieved by varying the shape of combustion chamber. In order to study the effect of shapes of different combustion chambers on performance of diesel engine, Toroidal Re-entrant Combustion Chamber (TRCC), Lateral Swirl Combustion Chamber (LSCC), Dual Swirl Combustion Chamber (DSCC) and Lateral Dual Swirl Combustion Chamber (LDSCC) were developed without changing compression ratio of standard diesel engine. Experiments were carried out using optimum injection timing of 270bTDC, injector opening pressure of 240 bar and nozzle geometry of 6 holes with 0.2 mm diameter. Results of DI diesel engine operated with SuOME revealed that the LSDCC shape resulted in improved engine brake thermal efficiency with minimum HC and CO emission levels compared to other selected combustion chamber shapes. [ABSTRACT FROM AUTHOR]

Performance characteristics of a WCO (Waste cooking oil) based compression ignition engine was investigated. A single cylinder water-cooled, direct injection diesel engine was used. Base data was generated with diesel and neat WCO as fuels. Subsequently, WCO oil was converted into its emulsions and tested in the diesel engine. Results showed increased specific energy consumption, higher smoke, hydrocarbon and carbon monoxide emissions with neat WCO in the engine as compared to neat diesel. The specific energy consumption was found as 20200 kJ/kW.hr with neat WCO and 15380 kJ/kW.hr with diesel at the maximum power output of 4.4 BMEP. It was improved to 19190 kJ/kW.hr with WCO emulsions at the maximum power output. Smoke emission was reduced from 4.4 BSU with neat WCO to 2.6 BSU with WCO emulsion in the unmodified diesel engine at the maximum power output. WCO resulted in reduced the NO emission at all power outputs as compared to neat WCO due to inferior combustion. NO emission was reduced further with WCO emulsions at all power outputs. Peak pressure was found lower neat WCO at all power outputs. However it was increased with WCO emulsions due to improvement in combustion. Ignition delay was observed as higher with neat WCO. It was further increased with the WCO emulsions. It is concluded that neat WCO can be used as fuel in diesel engine with slightly inferior performance. WCO emulsions can result in superior performance and reduced emissions mainly at peak power outputs. [ABSTRACT FROM PUBLISHER]