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DISTURBANCE FIELD CHARACTERISTICS OF A TRANSVERSELY EXCITED BURNER

机译：横向激励燃烧器的扰动场特征

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Transverse acoustic instabilities in premixed, swirl-stabilized flames are an important problem in low NO_X combustors. Transverse excitation of swirling flames involves complex interactions between acoustic waves and fluid mechanic instabilities. This paper presents high-speed PIV characterization of the flow field characteristics of a swirling, annular jet under reacting and nonreacting conditions. These data show that the flame response to transverse acoustic excitation is a superposition of acoustic and vortical disturbances that fluctuate in both the longitudinal and transverse direction. In the nozzle near-field region, the disturbance field is a complex superposition of short wavelength and convecting vortical disturbances, as well as longer wavelength transverse and longitudinal acoustic disturbances. Very near the nozzle, distinct vortical structures are evident that are associated with the separating inner and outer annulus shear layers. Their relative phasing on the left and right side of the burner annulus changes by 180° under conditions where the burner center-line is nominally at a transverse acoustic velocity node and antinode. These suggest that the dominant excited instability mode of the annular jet changes from axisymmetric to helical as the structure of the acoustic mode shape changes. Farther downstream, these structures disappear rapidly and the disturbance field is dominated by the longer wavelength, transverse acoustic field.
机译：在低NO_X燃烧器中，预混合，旋流稳定火焰中的横向声不稳定性是一个重要问题。旋转火焰的横向激发涉及声波与流体力学不稳定性之间的复杂相互作用。本文介绍了在反应和非反应条件下旋流，环形射流的流场特性的高速PIV表征。这些数据表明，火焰对横向声激发的响应是在纵向和横向均波动的声学和涡旋扰动的叠加。在喷嘴近场区域，扰动场是短波长和对流涡旋扰动以及较长波长的横向和纵向声扰动的复杂叠加。非常靠近喷嘴，明显的涡旋结构与分离的内部和外部环形剪切层相关。在燃烧器中心线名义上位于横向声速波节和波腹处的条件下，它们在燃烧器环的左侧和右侧的相对相位变化了180°。这些表明，随着声模形状的变化，环形射流的主要激发不稳定性模式从轴对称变为螺旋形。在更远的下游，这些结构迅速消失，并且干扰场由较长波长的横向声场控制。

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