中文摘要：

内燃兰金循环发动机采用氧气代替空气作为助燃剂，规避了氮排放物，可以以较低成本通过冷凝过程分离废气中的水蒸气和二氧化碳，随后对二氧化碳进行回收，实现了采用化石燃料的超低排放循环。本文利用自主开发的内燃兰金循环发动机试验台架对喷水温度对燃烧过程的影响进行了试验研究。研究结果表明，在燃烧过程中喷入循环水可控制燃烧速率，使最大爆发压力后移。相同的喷水脉宽及喷射压力下，高喷水温度时发动机的IMEP显著高于低温喷水工况，较高的喷水温度可增加上止点附近进入缸内的焓值，故可通过提高喷水温度增加IMEP，进而提高循环热效率。

英文摘要：

Internal combustion Rankine cycle （ICRC） engine uses oxygen instead of air as oxidant during the combustion process, therefore totally eliminates the emission of NOx. CO2 could be captured after separated from the exhaust gas, the latter are mainly water vapor and CO2, through condensation at a relatively low price, thus an ultra-low emission working cycle is achieved. In this paper the effect of water injection temperature on combustion process of ICRC is studied based on bench tests of a prototype engine. Results show that water injection process could control the eombusion rate and postpone the combustion phase. The IMEP of higher injection temperature is higher than that of lower injection temperature under same injection pressure and duration. Higher injection temperature would bring more enthalpy into the cylinder near top dead centre, therefore enhance cycle performance and thermo efficiency.