Canadian Journal of Pure & Applied Sciences

Abstract: In this study, the effects of engine speed on the injection timing and engine performance of 4-cylinder direct injection (DI) hydrogen fueled engine were investigated. The 4-cylinder direct injection hydrogen engine model was developed utilizing the GT-Power commercial software. This model was employed one dimensional gas dynamics to represent the flow and heat transfer in the components of engine model. Sequential pulse injectors was adopted to the inject hydrogen gas fuel within the compression stroke. Injection timing was varied from 1100 before top dead center (BTDC) until 00 top dead center (TDC) timing. Engine speed was varied from 2000 rpm to 6000 rpm. The validation was performed with the existing previous experimental results. The negative effects of the interaction between ignition timing and injection duration was highlighted and clarified. The acquired results show that the engine speeds are strongly influence on the injection timing and engine performance. It can be seen that the indicated efficiency increases with decreases of engine speed; power increases with the decreases of engine speed; indicated specific fuel consumption (ISFC) increases with increases of engine speed. The injection timing of 600 BTDC was the overall optimum injection timing with a compromise.