本文结合旋流火焰和滞止火焰的特点,发展了一种新的滞止弱旋火焰燃烧器.首先,基于中心通流的弱旋旋片发展了旋片旋流数的实验测量方法,并结合推导的适用于弱旋旋片的旋流数计算公式,为旋流数的准确测量提供了一种新的简单有效的途径.其次开展了关于火焰结构、贫燃极限、稳燃区间、火焰最高温度的研究,得出加入旋片后的滞止弱旋火焰的贫燃极限,比之常规滞止射流火焰,其当量比从 0.71 显著地降低到 0.51.最后,结合 PIV 技术开展了滞止弱旋火焰的流场实验研究.
In this paper, a stagnation-point swirl flame is initailly proposed by combining the advantages of both stagnation-point flames and low-swirl flames. First, a swirl-number calculation formula that is suitable for the inner-core ventilating swirler, namely the swiler of low swirl devices,is derived. And then a pressure-drop distribution domainated technique is developed for the accurate measurement of the swirl number of such kind of device. Furthermore, the flame structure, lean flammability, flame stablization and maximum flame temperature are studied in detail. Especially,with the addition of swirler, the lean flammability of stagnation-point swirl flame is extended from 0.71 (that is the lean fammability of stagnation-point jet flame) to 0.51. Finally, the flow-field of stagnation swirl flame is measured with particle-image-velocimetry (PIV).
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