当量油气比对内燃波转子燃烧特性的影响

为了研究当量油气比对内燃波转子燃烧特性的影响规律,采用控制变量法,保持内燃波转子转速、混气填充速度不变,通过调节燃料喷射体积流量改变混气的当量油气比。在不同的当量油气比下开展内燃波转子燃烧特性试验。试验结果表明:当量油气比对于内燃波转子燃烧过程影响很大,随着当量油气比的增加，内燃波转子获得的燃烧压力增益增大,在内燃波转子转速为900r/min、混气填充速度为6.741m/s、当量油气比为1.442时,6个工作循环内平均燃烧压力增益达到246.29％,火焰平均传播速度随当量油气比呈类似正态分布,在化学恰当比附近达到最大10.8m/s。当量油气比小于1时，两组工况下火焰锋面呈向下倾斜状传播,当量油气比大于1时，两组工况下火焰锋面呈向上倾斜状传播。 

Influence of equivalence fuel/air ratio on combustion characteristics of internal combustion wave rotor

In order to study the influence of equivalence fuel/air ratio on combustion characteristics of internal combustion wave rotor, the control variable method was used to keep the combustion wave rotor speed and gas filling speed constant by adjusting the fuel injection volume to change of equivalence fuel/air ratio. The experimental investigations on combustion characteristics of internal combustion wave rotor were conducted under different equivalence fuel/air ratios. The results showed that the equivalence fuel/air ratio had great influence on combustion process of internal combustion wave rotor. As the equivalence fuel/aird ratio increased, the combustion wave rotor obtaining combustion pressure gain increased. When the speed of the internal combustion wave rotor was 900r/min, the gas filling speed was 6.741m/s, and the equivalence fuel/air ratio was 1.442, the average combustion pressure gain of the six working cycles was up to 246.29%. The flame propagation velocity was similar to normal distribution with the change of equivalence fuel/air ratio, which reached a maximum 10.8m/s around the stoichiometric ratio. Under the condition of equivalence fuel/air ratio less than 1, the flame front was inclined downward, and the flame front was inclined upward in the case of the equivalence fuel/air ratio was greater than 1.