燃油喷雾对某小发环形回流燃烧室燃烧特性影响

Effect of fuel spray on combustion characteristics of a small engine annular reverse flow combustor

为研究燃油喷雾特性对某小发环形回流燃烧室主燃区燃烧特性的影响,采用数值模拟的方法,对环涡形燃烧室内燃油喷嘴伸入火焰筒的深度和喷雾偏转角度对燃烧室内的三维两相喷雾、燃烧特性进行了研究。结果表明:喷嘴位置和角度的变化,会导致燃油雾化性能的变化,从而引起燃烧特性的变化;随着喷嘴伸入火焰筒的深度变短,会导致高温区变窄且靠近火焰筒外壁,深度变长则会导致主燃区高温区减小且燃烧不充分;喷雾偏转角度顺时针旋转可使燃油在主燃区燃烧得更加充分。

In order to study the effect of fuel spray on the combustion characteristics of primary combustion zone of a small engine annular reverse flow combustor,numerical simulation method was used to study the three-dimensional two-phase spray and combustion characteristics of the annular reverse flow combustor by the insertion depth of the nozzle into the flame tube and spray deflection angle in the combustor.The results showed that:the change of nozzle position and angle caused the change of fuel atomization performance,which caused the change of combustion characteristics;as the depth of nozzle extending into the flame tube became shorter,it could make the high temperature zone narrow and close to the outer wall of the flame tube.The longer depth could lead to reduction of the high temperature zone of primary combustion zone and insufficient combustion;the clockwise rotation of the spray deflection angle can make the fuel burning more fully in the primary combustion zone.