高压缩比主动射流点火氨氢发动机燃烧特性研究
Investigation of Combustion Characteristics of Active Jet Ignition in Ammonia-Hydrogen Engine with High Compression Ratio
本文通过数值模拟研究了主动/被动射流点火模式、发动机压缩比、主动喷射压力和掺氢率对射流点火氨氢发动机燃烧特性的影响。结果表明，高掺氨率和被动射流点火模式下，提高发动机压缩比对缸内混合气燃烧速度的影响较小。相比于被动射流，主动射流点火可以明显提高发动机在高掺氨率条件下的点火能力和混合气燃烧速度。增大主动喷射压力，能够加快缸内混合气燃烧速度，缩短燃烧持续期，但主动喷射压力过高会导致缸内氢气局部过浓，氢气燃烧效率降低。提高进气道混合气的掺氢率，可以提高…查看全部>>
The effects of the active/passive jet ignition mode, engine compression ratio, pre-chamber injection pressure and hydrogen mixing ratio on the combustion characteristics of the jet ignition ammonia-hydrogen engine were investigated by numerical simulation. The results show that increasing the engine compression ratio has little effect on the combustion rate of the mixture in the cylinder under high ammonia mixing ratio and passive jet ignition mode. Compared…查看全部>>
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