Study on active combustion control technology using miniature jet actuator

小型分布式发电系统的微型燃气轮机（MGT）有望在未来的能源安全中发挥重要作用，并且对环境的影响较小。然而，用于MGT的小型燃烧室在低雷诺数和大范围的局部负荷下运行，难以保持稳定和清洁的燃烧。针对燃气轮机燃烧室中常见的甲烷-空气同轴射流火焰，采用安装在同轴喷管内表面的微型射流致动器对其进行主动控制。采用快速响应气动伺服阀实现了周期性径向微型喷射。通过操纵大型旋涡结构和相关的甲烷-空气混合以及执行器，证明了在不同负载条件下，火焰保持和排气特性都得到了显着改善。

Micro gas turbines (MGT) for small-scale distributed generation systems are expected to play a major role in the future energy security with lower environmental impacts. However, small combustors for MGT are operated at low Reynolds numbers with a wide range of partial load, where it is difficult to maintain stable and clean combustion. In the present study, a methane-air coaxial jet flame, which is commonly used in gas turbine combustors, is actively controlled with miniature jet actuators installed on the inner surface of the coaxial nozzle. The periodic radial miniature jet injections are realized by using a rapid-response pneumatic servo-valve. By manipulating the large-scale vortical structures and the associated methane-air mixing with the actuators, it is demonstrated that flame holding and exhaust gas characteristics are drastically improved under different load conditions.