不同结构参数对甲醇燃料大气式燃烧器引射性能影响分析及研究

为解决甲醇燃料完全预混式燃烧器启动温度高、速度慢、安全系数低等问题，设计了甲醇燃料大气式燃烧器. 采用数值模拟的方法，对其关键部件引射器的结构尺寸进行优化及燃烧器燃烧效果分析，着重研究了在不同输出功率下，喷嘴直径、喷嘴插入深度、入射角度、引射器喉管长度、喉管直径以及扩压管长度对引射器性能的影响，获得了甲醇燃料大气式燃烧器引射器的优化结构参数，进一步探索了甲醇蒸汽必要入射温度. 输出功率在20% ~ 120%之间时，优化后的燃烧器摩尔引射系数维持在4.35 以上，引射性能稳定；空气温度为293 K时，理论甲醇蒸汽必要入射温度仅为473 K，燃烧效率可达98%以上，最高温度达2 300 K以上.
To resolve the methanol-fueled fully premixed burner’s start temperature is over high, slow, and low safety factor, methanol fuel atmospheric burners were designed. Using the numerical simulation method, the structural dimensions of the key components of the ejector are optimized, and the combustion effect of the burner is analyzed. At different output power, the effects of diameter of nozzle, depth of nozzle insertion, incident angle, length of ejector throat, diameter of ejector throat and length of diffuser pipe on the ejector performance are studied emphatically. The optimized structural parameters of the methanol-fuel atmospheric burner ejector were obtained, further exploration of the necessary incident temperature of methanol steam. When the output power is between 20% and 120%, the Mole Ejecting Ratio of optimized burner was maintained at 4.35 or above, and the ejector performance is stable. When the air temperature reaches 293K, theoretically the necessary incident temperature of methanol vapor is only 473 K, combustion efficiency of up to 98%, the maximum temperature of 2 300 K or more.