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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Simultaneous three-component velocity measurements in a swirl-stabilized flame
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Simultaneous three-component velocity measurements in a swirl-stabilized flame

机译：在稳定涡流中同时进行三分量速度测量

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Modern gas turbines are operated with lean fuel mixtures causing instabilities of the heat release and, by means of a thermoacoustic coupling, oscillations of the flow velocity within the flame. Since these oscillations can reduce the combustion efficiency, a better understanding of their formation mechanism and spatial origin is necessary. Therefore, simultaneous, three-component (3C) velocity measurements with high measurement rate are required. The Doppler global velocimetry with laser frequency modulation (FM-DGV) achieves measurement rates up to 100 kHz and was successfully applied for measurements in flames, but does not provide simultaneous 3C velocity data. In order to overcome this drawback, the FM-DGV is extended to allow simultaneous 3C measurements. The functionality is demonstrated by measurements within a swirl-stabilized flame. In combination with time-resolved measurements of the sound pressure and chemiluminescence emission, the spatial origin of the sound pressure emission in the acoustic far-field is identified as flow velocity and heat release oscillations in the acoustic near-field of the flame. Hence, a deeper insight into the thermoacoustic coupling can be achieved.
机译：现代燃气轮机使用稀薄的燃料混合物运行，从而导致放热不稳定，并通过热声耦合使火焰内的流速振荡。由于这些振荡会降低燃烧效率，因此必须更好地了解其形成机理和空间起源。因此，需要同时进行具有高测量速率的三分量（3C）速度测量。具有激光频率调制（FM-DGV）的多普勒全局测速仪可实现高达100 kHz的测量速率，并已成功应用于火焰中的测量，但无法同时提供3C速度数据。为了克服此缺点，扩展了FM-DGV以允许同时进行3C测量。通过在稳定涡流的火焰中进行测量来证明其功能。结合声压和化学发光发射的时间分辨测量，在声远场中声压发射的空间起源被识别为火焰声近场中的流速和放热振荡。因此，可以更深入地了解热声耦合。

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