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利用快速压缩装置研究了天然气直喷燃烧循环变动。研究结果表明:借助于分层燃烧和由燃料喷射的湍流引发的快速火焰传播,天然气直喷燃烧在小当量比条件下能实现良好的燃烧稳定性,低的压力峰值循环变动,低的压力升高率峰值循环变动和低的燃烧放热率峰值循环变动。研究发现燃烧期和燃烧产物的循环变动高于压力峰值和燃烧放热率峰值循环变动。CO和未燃碳氢的循环变动依赖于后续燃烧期的循环变动,NOx的循环变动依赖于快速燃烧期的循环变动。在燃料最佳喷射条件下,天然气直喷燃烧的循环变动随当量比的变化并不敏感。
The rapid compression device was used to study the natural gas direct injection combustion cycle variation. The results show that with the help of stratified combustion and rapid flame propagation caused by turbulence of fuel injection, natural gas direct injection combustion can achieve good combustion stability under low equivalence ratio conditions, low pressure peak cycle variation, low pressure rise The peak cycle of high rate of change and low peak rate of combustion heat release cycle changes. The study found that the combustion cycle and combustion products cycle changes higher than the peak pressure and the combustion heat release rate peak cycle changes. The cyclic variation of CO and unburned hydrocarbons depends on the cyclic variation of the subsequent combustion period. The cyclic variation of NOx depends on the cyclic variation of the rapid combustion period. Under optimal fuel injection conditions, the cyclic variation of direct injection combustion of natural gas is not sensitive to changes in equivalence ratio.