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首页> 外文期刊>International Journal of Aeroacoustics >Flow and noise from septa nozzles
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Flow and noise from septa nozzles

机译：Septa喷嘴的流动和噪音

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摘要

Flow and noise fields are explored for the concept of distributed propulsion. A model-scale experiment is performed with an 8:1 aspect ratio rectangular nozzle that is divided into six passages by five septa. The septa geometries are created by placing plastic inserts within the nozzle. It is found that the noise radiation from the septa nozzle can be significantly lower than that from the baseline rectangular nozzle. The reduction of noise is inferred to be due to the introduction of streamwise vortices produced by secondary flow within each passage. Thus, the geometry of the internal passages of the septa nozzle can have a large influence. The flow evolution is profoundly affected by slight changes in the geometry. These conclusions are reached by experimental results of the flowfield aided by brief numerical simulations.
机译：分布式推进的概念探索了流动和噪声场。 使用8：1宽高比的矩形喷嘴进行模型规模实验，该喷嘴分为五个隔膜。 通过将塑料插入刀片放置在喷嘴内来产生隔膜几何形状。 发现来自隔膜喷嘴的噪声辐射可以明显低于基线矩形喷嘴的噪声辐射。 推断出噪声的减少是由于引入每个通道内的二次流动产生的流动涡流。 因此，隔膜喷嘴的内部通道的几何形状可以具有很大的影响。 流动演变深受几何变化的影响。 通过简短的数值模拟，通过流动场的实验结果达到了这些结论。

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