简要介绍了日本三菱柴油机公司为降低柴油机排气中的NOx排放量而开展的在燃烧室中喷水的试验研究。试验结果表明,采用喷水方法,可显著地减少NOx排放量,且对燃油消耗率无明显影响。 This paper briefly introduces the experimental research on the water injection in the combustion chamber by Japan’s Mitsubishi Diesel Engine Company to reduce the NOx emission in diesel engine exhaust gas. The test results show that the use of water spray method can significantly reduce NOx emissions, and no significant impact on fuel consumption.