为了提高氢气利用率，了解预混氢气对发动机爆震的影响，以WP7.270涡轮增压6缸柴油机为试验对象，在不同转速和负荷下采用进气歧管喷氢方式进行台架试验，试验燃料总质量恒定，增加氢气替代率直到发动机发出爆震指示，并与原机数据进行对比。研究结果表明:氢气最大置换率为83%，喷油正时提前，发动机热效率最大提高7.7%，缸内峰值压力最大提高39.6%， CO₂、 CO、HC和炭烟排放减少，NO_x排放升高，但在30%负荷下NO_x排放明显降低，且CO₂排放几乎为零，但燃烧不稳定。

In order to increase the hydrogen availability and understand the effects of premixed hydrogen on engine knock, a WP7.270 turbocharged 6-cylinder diesel engine was used as the research object and bench tests were carried out under different rotational speeds and loads based on the method of intake manifold hydrogen injection. The total mass of test fuel kept constant, the mass fraction of hydrogen increased until the engine knock occurred, and the test results were compared with the original data. The results show that the maximum displacement rate of hydrogen is 83%, the gas injection timing advances, the engine thermal efficiency increases by 7.7%, the in-cylinder peak pressure increases by 39.6%, and the CO₂, CO, HC and soot emissions reduce. The NO_x emissions increases, but reduces obviously at the load of 30%. The CO₂ emission is almost zero. In addition, the combustion is not stable.