This final report summarises the aims, methodology and results of the project that developed a system to retrofit standard diesel engines to allow them to run on hydrogen gas.
In this work, an experimental and numerical study of the second-generation DISI hydrogen-fuelled engine was undertaken under boosted conditions. Figure 5 shows the second-generation hydrogen-fuelled engine developed at the University of Melbourne. Consistent with prior works, engine operation with compression ratios of 12:1 and 14:1 was found to be knock-limited at richer conditions, more advanced spark timings, and particularly at the higher compression ratio. Retarding the injection timing from early and homogeneous injection also demonstrated tradeoffs between efficiency, power, and NO emissions, and were again consistent with prior studies. Water injection into the intake manifold was then implemented to suppress autoignition and knock, and thus enable diesel-like power via richer operation at more optimal operating conditions.