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Experimental Study on Flat Flame Combustion for Ultra Micro Gas Turbine Applications

机译：超微型燃气轮机平焰燃烧实验研究

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摘要

The requirement for efficient power sources for portable electronics and miniature mechanical devices, such as laptops, micro robots, or micro aerial vehicles, has led to research on the ultra micro gas turbine (UMGT). The ultra micro gas turbine is one of the most promising power sources for small-scale applications due to its higher power and energy densities compared to currently used batteries. In order to realize UMGT as a viable power source, its individual components have to be developed, since downscaling introduces new problems for each component. Since the micro combustor is one of the key components of UMGT, it has to be improved. Until now, it has been very difficult for micro combustors to achieve wide flame stability, high combustion efficiency, and clean combustion with low pressure loss, due to the associated downscaling problems, such as high heat loss and small residence time. In order to achieve wide flame stability, the effect of preheating the reactants on flat flame stabilization was investigated experimentally on a 46-mm inner diameter quartz-walled flat flame combustor. The experimental results showed that preheating improves flat flame stabilization. Since preheating increases the burning velocity, flat flame can stabilize at higher incoming flow velocities as long as they are lower than the burning velocities. From the relationship between the incoming flow velocities and burning velocities, a correlation was obtained for flat flame micro combustors for micro power generation applications. With this correlation, it is possible to determine the minimum combustor diameter required for stable flat flame combustion. Also, in order to have a stable flat flame at higher mass flow rates, the correlation enables the calculation of the required reactants temperature, and is a major contribution to the design of micro combustors.
机译：对于便携式电子设备和微型机械设备（例如笔记本电脑，微型机器人或微型飞行器）的高效电源的需求，导致了对超微型燃气轮机（UMGT）的研究。超微型燃气轮机由于与目前使用的电池相比具有更高的功率和能量密度，因此是用于小型应用的最有前途的动力源之一。为了实现UMGT作为可行的电源，必须缩减其各个组件，因为缩小尺寸会给每个组件带来新的问题。由于微型燃烧器是UMGT的关键组件之一，因此必须对其进行改进。迄今为止，由于相关的降尺度问题，例如高热量损失和短停留时间，微型燃烧器很难实现宽广的火焰稳定性，高燃烧效率和低压力损失的清洁燃烧。为了获得宽广的火焰稳定性，在46毫米内径石英壁扁平火焰燃烧器上实验研究了预热反应物对扁平火焰稳定的影响。实验结果表明，预热改善了扁平火焰的稳定性。由于预热会提高燃烧速度，因此扁平火焰可以稳定在较高的进入流速下，只要它们低于燃烧速度即可。从进入的流速与燃烧的速度之间的关系，获得了用于微发电应用的平焰微燃烧器的相关性。利用这种相关性，可以确定稳定的平坦火焰燃烧所需的最小燃烧器直径。而且，为了在较高的质量流量下具有稳定的平坦火焰，该相关关系使得能够计算所需的反应物温度，并且对微燃烧器的设计做出了重要贡献。

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