标题： 使用高频PIV对燃气轮机喷嘴中反应流场动力学的表征 显示英文标题

标题： Characterization of the reactive flow field dynamics in a gas turbine injector using high frequency PIV

摘要： 本工作详细分析了代表燃气轮机燃烧室的实验旋流稳定燃烧器的空气动力学特性。 此分析是通过在反应条件下进行的高频PIV（HFPIV）测量完成的。 虽然这些信息通常以较低的速率提供，但时间分辨的PIV测量对于更好地理解本质上不稳定的高湍流旋流流动是必要的。 得益于最近的技术改进，开发了一个工作频率为12 kHz的PIV系统，用于研究该实验燃烧室的流动场。 首先获得并分析了燃烧器的统计量，检查了测量质量，然后对速度场进行了时间分析，表明在燃烧室内周期性地出现大的相干结构。 这些结构的频率非常接近燃烧室的四分之一波长模式，为燃烧不稳定性的耦合提供了一个可能的解释。 显示英文摘要

摘要： The present work details the analysis of the aerodynamics of an experimental swirl stabilized burner representative of gas turbine combustors. This analysis is carried out using High Frequency PIV (HFPIV) measurements in a reactive situation. While this information is usually available at a rather low rate, temporally resolved PIV measurements are necessary to better understand highly turbulent swirled flows, which are unsteady by nature. Thanks to recent technical improvements, a PIV system working at 12 kHz has been developed to study this experimental combustor flow field. Statistical quantities of the burner are first obtained and analyzed, and the measurement quality is checked, then a temporal analysis of the velocity field is carried out, indicating that large coherent structures periodically appear in the combustion chamber. The frequency of these structures is very close to the quarter wave mode of the chamber, giving a possible explanation for combustion instability coupling.