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PARAMETRIC STUDY OF INSTALLED FOGGING SYSTEMS USING CFD MODEL

机译:基于CFD模型的雾化系统参数化研究

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Water fogging of inlet air has become widely acceptable for gas turbine power augmentation. Fogging systems are generally designed for a specific set of conditions called the design point. As a rule, the design point is specified to provide the maximum capacity of the fogging system at extreme ambient temperatures, when gas turbine power output is maximally decreased.Since the extreme ambient conditions rarely occur, the fogging system primarily operates at partial loads, when only a part of the installed cooling stages is in operation. At partial loads the fogging system does not provide uniform fogging of the inlet air, which could result in insufficient fog evaporation, less air-cooling and entrainment of non-evaporated water into the compressor.Prolonged operation at such off-design conditions requires careful tuning of the system in order to maximize cooling efficiency and eliminate a possible impact on gas turbine maintenance. This requires clear understanding of conceptual features of thin droplets evaporation and fog cloud behavior inside gas turbine inlet ducts.To this purpose, computational fluid dynamics (CFD) analysis was used. A CFD model is described, which comprises a straight duct equipped with fog nozzles operating in conditions similar to field conditions at design point, as well as, at partial load operation of the fogging system.The study focused on problems, which are critical in design and operation of real fogging systems, namely: single droplet, mono- and poly-fraction fog evaporation; influence of flow turbulent intensity; fog cloud shape and dimensions; poly-fraction fog evaporation in the wide range of ambient conditions; over-spray and under-spray operation of the fogging system.The study results were helpful in the tuning of the installed fogging systems to site specific ambient conditions thatprovided efficient cooling with safe compressor operation. These results should be useful to both designers and operators of the fogging systems.
机译:入口空气的水雾已广泛接受燃气涡轮机电源增强。雾化系统通常设计用于称为设计点的特定条件。通常,当燃气涡轮机电力输出最大降低时,指定设计点以在极端环境温度下提供雾化系统的最大容量。 由于极端的环境条件很少发生,因此雾化系统主要在部分载荷时操作,当仅安装的冷却级的一部分进行操作时。在局部载荷时,雾化系统不提供入口空气的均匀雾化,这可能导致雾蒸发不足,较少的空冷和非蒸发水夹带到压缩机中。 在这种偏离设计条件下长时间的操作需要仔细调整系统,以最大限度地提高冷却效率并消除对燃气轮机维护的可能影响。这需要清楚地了解汽轮机入口管内薄滴蒸发和雾云行为的概念特征。 为此目的,使用计算流体动力学(CFD)分析。描述了一种CFD模型,其包括配备有雾喷嘴的直管道,该雾喷嘴在类似于设计点的现场条件的条件下操作,以及在雾化系统的部分负载操作中。 该研究专注于问题,这在实际雾化系统的设计和运行中至关重要,即:单液滴,单滴和多部分雾蒸发;流动湍流强度的影响;雾云形状和尺寸;多级雾雾在各种环境条件下蒸发;雾化系统过度喷涂和喷涂操作。 研究结果有助于将安装的雾化系统调谐到现场特定的环境条件 提供高效的冷却,安全压缩机操作。这些结果对于雾化系统的设计者和运营商都应该是有用的。

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