The effect of variable water injection timing on performance and emission characteristics of hydrogen fueled compression ignition (HFCI) engine has been investigated and the results are presented in this paper. In this study, water is injected from 20°BTDC to 20°ATDC with injection duration of 20°CA and 40°CA. Hydrogen is injected at the intake port with fixed injection timing from 0°CA to 40°CA and constant flow rate of 5 LPM. The results indicate that water injection timing of 20°ATDC and duration of 20°CA has shown better engine performance due to increased gross indicated work and indicated thermal efficiency. It has also demonstrated that the lowest NOx concentrations for engine speed greater than 2500 RPM and lower EGT throughout entire speed range. Water injection timing of 20°BTDC and duration of 40°CA has shown the highest heat release rate and the longest ignition delay. Water injection timing of 0°CA and duration of 40°CA indicated that the highest O2 and SO2 emissions throughout entire speed range. It is observed that water injection technique appears to be promising method to enhance the performance and emissions quality of HFCI engine effectively.
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