Impact of supercharging and compression ratio on performance characteristics in a single cylinder DICI engine

Abstract

This work investigated the influence of variation of supercharging pressure and compression ratio on performance characteristics in a single cylinder direct injection compression ignition (DICI) engine. The engine was coupled with centrifugal blower type supercharger and compression ratio varied as 14:1, 16:1, 17.5:1 and 18:1. The boost pressures (BPs) were changed at four levels 0.5 kPa (g), 1 kPa (g), and 1.5 kPa (g) along with natural aspiration. The experiments were conducted by varying of these two parameters for investigating the impact on performance characteristics using the standard petrodiesel (type 2) as fuel. The obtained results are compared with the standard operating condition of the engine, i.e., natural aspiration at compression ratio 17.5:1. The results show that the improvement in BSFC, BTE was higher at low load, higher compression ratio and at elevated BPs, whereas enhancement for EGT is found to be more at the higher side of working input parameters. The maximum improvement in performance parameters such as BTE, BSFC and EGT, were noted 25.4 %, 21.7 %, and 3.3 % respectively. The specific power of engine has distinctly increased by 15 %, 25 %, 27 %, and 16 % at CR 14, 16, 17.5, and 18, respectively at 1.5 kPa (g) as compared to standard operating condition.