In order to characterize the influence of cavitation in a nozzle on a turbulent premixed kerosene/air flame, an experimental study was conducted using a NexGen burner. This study was carried out in two distinct stages. The first stage was devoted to characterizing the necessary conditions for inducing the cavitation phenomenon, using a novel experimental device enabling fluidic study. The second stage enabled the characterization of the influence of cavitation on a flame, building upon the previously obtained results. To this end, three DELAVAN nozzles (2.25; 2.5; 3.0 80 W) were employed. The fluidic characterization stage involved the manufacture of transparent nozzles, facilitating the integration of piezoelectric pressure sensors. The results showed that cavitation has a significant influence on the temperature and density heat flux flame associated to the effect on the flame structure represented by three distinct zones: continuous flame, intermittent flame and plume flame. For the 2.25 80 W nozzle based on the smallest diameter, the risk of cavitation is the highest, and the results showed that for the lowest value of the cavitation number, the continuous flame was no longer visible proving the harmful effects of cavitation on the combustion of a premixed flame from a burner such as the NexGen burner.

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空化现象对湍流预混火焰煤油/空气效率影响的实验研究

为了表征喷嘴中的空化对湍流预混合煤油/空气火焰的影响，使用 NexGen 燃烧器进行了实验研究。这项研究分两个不同的阶段进行。第一阶段致力于使用一种能够进行流体研究的新型实验装置来表征诱发空化现象的必要条件。第二阶段基于先前获得的结果，能够表征空化对火焰的影响。为此，采用了三个 DELAVAN 喷嘴（2.25；2.5；3.0 80 W）。流体表征阶段涉及透明喷嘴的制造，以促进压电压力传感器的集成。结果表明，空化对温度和密度热流密度火焰有显着影响，而火焰结构则由连续火焰、间歇火焰和羽流火焰三个不同区域所代表。对于基于最小直径的2.25 80 W喷嘴，空化风险最高，结果表明，对于空化数最低值，连续火焰不再可见，证明了空化对燃烧的有害影响来自 NexGen 燃烧器等燃烧器的预混合火焰。