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等离子体由于可以同时在燃料反应中增加化学效应与热效应,有望成为辅助点火的有效技术途径。构建了基于激波管的等离子体辅助甲烷点火实验系统,测量了甲烷自点火、持续放电以及放电后断电条件下的点火延迟时间,分析了不同稀释气体下等离子体对甲烷点火延迟的缩短效果。构建了等离子体发射光谱测量系统,测量了放电单元中的发射光谱。在实验条件下,点火温度越高,持续放电下活性粒子的浓度越高。较小的放电功率(<4 W)即可将甲烷的点火延迟时间缩短30%~95%。稀释气体为Ar时,等离子体在点火温度小于1 000 K或大于1 400 K时对甲烷点火延迟时间缩短作用更好。稀释气体为N2时,随着点火温度的升高,等离子体对甲烷点火延迟时间作用效果随之降低。
Plasma is expected to be an effective technique to assist ignition because it can increase both chemical and thermal effects in the fuel reaction at the same time. A plasma-assisted methane ignition experiment system based on shock tube was constructed. The ignition delay time of methane after self-ignition, continuous discharge and power-off after discharge was measured. The effect of plasma on the ignition delay of methane was analyzed under different dilution gases . A plasma emission spectrometry system was constructed to measure the emission spectra of the discharge cells. Under the experimental conditions, the higher the ignition temperature, the higher the concentration of active particles under continuous discharge. The smaller discharge power (<4 W) shortens the ignition delay of methane by 30% -95%. When the diluent gas is Ar, the effect of shortening the ignition delay time of methane is better when the ignition temperature is less than 1 000 K or more than 1 400 K. When the diluent gas is N2, as the ignition temperature increases, the effect of the plasma on the ignition delay of methane decreases.