The effect of ozone (O₃) addition on ethylene (C₂H₄) non-premixed jet flames is investigated. Stable C₂H₄ lifted flames are established with oxygen/nitrogen co-flow at reduced oxygen content conditions. It is observed in the experiments that after O₃ addition, the flame liftoff height could either increase or decrease, depending on the initial value of the flame liftoff height before O₃ is added. Formaldehyde (CH₂O) planar laser-induced fluorescence (PLIF) measurement shows that prompt ozonolysis reaction between C₂H₄ and O₃ produces large amounts of CH₂O upstream of the flame. In contrast to previous studies of O₃ addition on lifted flames—with saturated hydrocarbon fuels in which O₃ decomposition dominates—the ozonolysis reaction between C₂H₄ and O₃ changes the chemical composition of flow even at room temperature. Such chemical reaction causes the simultaneous increase of both the triple flame propagation speed of lifted flame and the axial jet velocity along the stoichiometric contour, which also therefore changes the dynamic balance between these two values to stabilize the flame. While the increase of triple flame propagation speed tends to decrease the flame liftoff height, the increase of axial jet velocity along the stoichiometric contour tends to have the opposite effect. A competing kinetic-dynamic process forms, and the final location of the flame depends on the degree of ozonolysis reaction, which is determined by the initial flame liftoff height before O₃ is added.

研究了臭氧（O ₃）添加对乙烯（C ₂ H ₄）非预混喷射火焰的影响。稳定的 C ₂ H ₄离焰是在氧含量降低的条件下用氧/氮共流建立的。在实验中观察到，加入O ₃后，火焰升空高度可以增加也可以降低，这取决于加入O ₃之前火焰升空高度的初始值。甲醛 (CH ₂ O) 平面激光诱导荧光 (PLIF) 测量表明，C ₂ H ₄和 O ₃之间的快速臭氧分解反应产生大量 CH₂ O 火焰上游。与之前在离焰中添加O _{3的研究相比——使用其中 O 3}分解占主导地位的饱和烃燃料——C ₂ H ₄和 O _{3之间的臭氧分解反应}即使在室温下也会改变流动的化学成分。这种化学反应导致离焰的三重火焰传播速度和沿化学计量轮廓的轴向射流速度同时增加，因此也改变了这两个值之间的动态平衡以稳定火焰。虽然三重火焰传播速度的增加往往会降低火焰升空高度，但沿化学计量轮廓的轴向射流速度的增加往往会产生相反的效果。形成一个相互竞争的动力学过程，火焰的最终位置取决于臭氧分解反应的程度，臭氧分解反应的程度由添加 O ₃之前的初始火焰升空高度决定。