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首页> 外文期刊>Combustion Science and Technology >TURBULENT STRUCTURE AND DYNAMICS OF SWIRLED, STRONGLY PULSED JET DIFFUSION FLAMES
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TURBULENT STRUCTURE AND DYNAMICS OF SWIRLED, STRONGLY PULSED JET DIFFUSION FLAMES

机译：旋流强脉冲射流扩散火焰的湍流结构和动力学

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摘要

The structure and dynamics of swirled, strongly puked, turbulent jet diffusion flames were examined experimentally in a co-flow swirl combustor. The dynamics of the large-scale flame structures, including variations inflame dimensions, the degree of turbulent flame puff interaction, and the turbulent flame puff celerity were determined from high-speed imaging of the luminous flame. All of the tests presented here were conducted with a fixed fuel injection velocity at a Reynolds number of 5000. The flame dimensions were generally found to be more impacted by swirl for the cases of longer injection time and faster co-flow flow rate. Flames with swirl exhibited a flame length up to 34% shorter compared to nonswirled flames. Both the turbulent flame puff separation and the flame puff celerity generally decreased when swirl was imposed. The decreased flame length, flame puff separation, and flame puff celerity are consistent with a greater momentum exchange between the flame and the surrounding co-flow, resulting from an increased rate of air entrainment due to swirl. Three scaling relations were developed to account for the impact of the injection time, the volumetric fuel-to-airflow rate ratio, and the jet-on fraction on the visible flame length.
机译：在同流旋流燃烧器中实验性地检查了旋流，强突流，湍流射流扩散火焰的结构和动力学。大型火焰结构的动力学，包括变化的火焰尺寸，湍流的粉扑相互作用程度以及湍流的粉扑速度，是通过对发光火焰的高速成像来确定的。此处介绍的所有测试都是在雷诺数为5000的固定燃料喷射速度下进行的。在更长的喷射时间和更快的并流流速的情况下，通常发现火焰尺寸受旋流的影响更大。与非旋流火焰相比，旋流火焰的火焰长度缩短了34％。当施加涡流时，湍流的火焰抽吸分离和火焰抽吸速率通常都降低。减少的火焰长度，火焰抽吸分离和火焰抽吸速率与火焰和周围同流之间更大的动量交换相一致，这是由于旋流导致空气夹带率增加。开发了三种比例关系，以说明喷射时间，体积燃料与空气流速之比以及喷射分数对可见火焰长度的影响。

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