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Acoustic Modes in a Plenum Downstream of a Multitube Pulse Detonation Combustor
AIAA Journal ( IF 2.5 ) Pub Date : 2021-08-31 , DOI: 10.2514/1.j060416
Fabian Habicht 1 , Fatma Cansu Yücel 1 , Mohammad Rezay Haghdoost 1 , Kilian Oberleithner 1 , Christian Oliver Paschereit 1
Affiliation  

The operation of a multitube pulse detonation combustor (PDC) evokes undesirable pressure fluctuations for a turbine downstream of the combustor. Pressure measurements in a downstream annular plenum reveal distinct pressure fluctuations. Although pressure peaks due to the shock waves emanating from the PDC tubes have been investigated in previous studies, pressure oscillations throughout the remaining cycle duration have received far less attention. Based on azimuthal and frequency mode decomposition of pressure signals at six circumferential positions, these oscillations are found to result from acoustic modes that are excited by PDC operation. This conclusion is verified by comparison with numerically calculated eigenmodes of the plenum. The impact of different operating parameters and the plenum outlet geometry on the acoustic oscillations are determined. The sequential firing of the PDC tubes at the lowest firing frequency in combination with a small blockage ratio was identified as the favorable configuration for the smallest acoustic fluctuations.



中文翻译:

多管脉冲爆震燃烧室下游气室中的声学模式

多管脉冲爆震燃烧器 (PDC) 的运行会引起燃烧器下游涡轮机的不希望有的压力波动。下游环形增压室中的压力测量显示出明显的压力波动。尽管在先前的研究中已经研究了由于从 PDC 管发出的冲击波引起的压力峰值,但在整个剩余周期持续时间内的压力振荡很少受到关注。基于六个圆周位置的压力信号的方位角和频率模式分解,发现这些振荡是由 PDC 操作激发的声学模式引起的。该结论通过与压力通风系统的数值计算特征模态进行比较而得到验证。确定了不同操作参数和增压出口几何形状对声学振荡的影响。PDC 管以最低点火频率顺序点火并结合小阻塞率被认为是最小声波波动的有利配置。

更新日期:2021-08-31
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