A numerical study on the effect of various combustion bowl parameters on the performance, combustion, and emission behavior on a single cylinder diesel engine

Abstract

Abstract A numerical study was carried out to study the ef- fect of various combustion bowl parameters on the perfor- mance behavior, combustion characteristics, and emission magnitude on a single cylinder diesel engine. A base combus- tion bowl and 11 different combustion bowls were created by varying the aspect ratio, reentrancy ratio, and bore to bowl ratio. The study was carried out at engine rated speed and a full throttle performance condition, without altering the com- pression ratio. The results revealed that the combustion bowl parameters could have a huge impact on the performance be- havior, combustion characteristics, and emissionmagnitude of the engine. The bowl parameters, namely throat diameter and toroidal radius, played a crucial role in determining the per- formance behavior of the combustion bowls. It was observed that the combustion bowl parameters, namely central pip dis- tance, throat diameter, and bowl depth, also could have an impact on the combustion characteristics. And throat diameter and toroidal radius, central pip distance, and toroidal corner radius could have a consequent effect on the emission magni- tude of the engine. Of the different combustion bowls tested, combustion bowl 4 was preferable to others owing to the superior performance of 3% of higher indicated mean effective pressure and lower fuel consumption. Interestingly, trade-off for NOx emission was higher only by 2.85% com- pared with the base bowl. The sensitivity analysis proved that bowl depth, bowl diameter, toroidal radius, and throat diame- ter played a vital role in the fuel consumption parameter and emission characteristics even at the manufacturing tolerance variations.