Many industrial combustion devices rely on jet flame combustion in the crossflow to achieve mixing and reaction. Previous research offers a limited predictive capability regarding the coupling effects of the crossflow and jet flow on the flame radiative fraction. In this work, a new theoretical equation is derived to relate the radiative fraction to the fuel flow rate and the crossflow velocity. The experimental results show that the flame length increases as the crossflow velocity increases for all considered flames. The results of this work suggest that the stretching factor is 0.08 s. The radiative fraction is almost independent of the nozzle diameter in the case of a low crossflow velocity. The crossflow has the strongest effect on the radiative fraction for a smaller nozzle diameter. This is because of the effect of the crossflow and jet flow velocities on the soot residence time, which is proportional to the radiative fraction.

中文翻译：

---

丙烷射流扩散火焰在横流中的辐射分数和火焰长度

许多工业燃烧装置依靠横流中的喷射火焰燃烧来实现混合和反应。先前的研究对横流和射流对火焰辐射分数的耦合影响提供了有限的预测能力。在这项工作中，推导出了一个新的理论方程，将辐射分数与燃料流量和横流速度联系起来。实验结果表明，对于所有考虑的火焰，火焰长度随着横流速度的增加而增加。这项工作的结果表明拉伸因子为 0.08 s。在低错流速度的情况下，辐射分数几乎与喷嘴直径无关。对于较小的喷嘴直径，横流对辐射分数的影响最强。