Optimization of combustion parameters for CRDI small single cylinder diesel engine by using response surface method

Abstract

Limited fossil fuel’s reservoir capacity and pollution caused by them are the big problem today in the world. The small diesel engine, working with a conventional fuel injection system was the major contributor to this. The current study represented a statistical investigation of such a small diesel engine. A mechanical fuel injection system of the small diesel engine was retofitted with a simple version of the electronic common rail diesel injection (CRDI) system in the present study. The effect of combustion parameters such as compression ratio (CR), injection pressure (IP) and start of injection timing (IT) was considered in the study. The study was performed to optimize these parameters with respect to performance and emission aspects. The reduction in parameters such as carbon monoxide (CO), nitrogen oxides (NOx), smoke and hydrocarbon (HC) from engine exhaust gases were considered in the emission aspect. Improve brake thermal efficiency (BTE) and fuel economy was considered in the performance aspect. The response surfaced method (RSM) was used to optimise these combustion parameters. The regression equations were obtained for measurable performance and emission parameters using the RSM model. The surface plots derived from the regression equations were used to analyse the effect of considered combustion parameters. Diesel injected at a pressure 600 bar, with retarded injection timing 15° crank angle (CA) before top dead center (bTDC) and compression ratio set at 15 was found to be optimum for this CRDI small diesel engine. The further validation of optimum parameters was done by conducting a confirmatory test on the engine. The maximum error in prediction was found to be 2.7%, which shows the validation of the RSM model.

Optimization of combustion parameters of CRDI diesel engine blended with waste cooking oil along with hydrogen enrichment

“…This array of benefits has prompted numerous researchers to conduct experiments on small-scale diesel engines. They often perform statistical analyses by retrofitting the common rail direct injection (CRDI) system and making requisite adjustments to its associated characteristics [4][5][6][7][8][9][10][11][12]. In a test on a diesel engine with CRDI assistance, Hwang et al [6] found that the combustion parameters were significantly improved over those of the conventional system.…”

“…In a test on a diesel engine with CRDI assistance, Hwang et al [6] found that the combustion parameters were significantly improved over those of the conventional system. Dond and Gulhane [7][8][9][10] conducted experiments on a CRDI singlecylinder diesel engine and determined the optimum values for injection system parameters, such as pilot and main injection timing of fuel, along with the quantity of fuel to be supplied during these two periods. The same injection parameters were considered in the present study as well.…”