利用二维粒子成像速度仪(PIV)对钝体燃烧器中的甲烷/湿空气扩散燃烧的速度场进行测量,考察其火焰的结构特性及其内部流动状况.通过对湿空气燃烧流场与普通燃烧流场的对比分析表明,湿空气燃烧情况下,两种燃烧状态的火焰(回流燃烧火焰和中心射流主导火焰)相互转换的燃空速度比(γ)值要比普通燃烧的小;湿空气燃烧使得喷嘴后的同流空气的速度降低,空气的回流作用减弱,燃料更容易冲出回流区,火焰的稳定性能变差.
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