Abstract: Under the dual pressure of energy and environment, hydrogenation in natural gas engines is a good way to improve engine characteristics. In order to study the effect of hydrogenation ratio on the combustion and performance of natural gas engine, this paper will carry out hydrogenation equipment modification and bench test on a natural gas engine. The research results show that hydrogenation can accelerate the flame propagation speed of the mixture, shorten the duration of combustion in the cylinder, and significantly advance the combustion center of gravity, further increasing the maximum combustion temperature and maximum explosion pressure. But with the increase of engine load, this promotion effect is gradually weakened.

Key words: Natural gas engine; Hydrogenation ratio; Combustion performance; Bench test

摘要： 在能源与环境的双重压力下，天然气发动机中加氢是一种可以改善发动机特性很好的 途径。为了研究加氢的比例对天然气发动机燃烧与性能的影响，文章将对一台天然气发动机 进行加氢设备改造并进行台架试验。研究结果表示，加氢可以加快混合气火焰传播速度，缩 短缸内燃烧的持续期，并明显提前燃烧重心，进一步提高最高燃烧温度和最高爆发压力。但 随着发动机负荷的增加，这种促进作用在逐渐减弱。

关键词: 天然气发动机；加氢比例；燃烧性能；台架试验