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首页> 外文会议>ASME turbo expo >NUMERICAL ANALYSIS OF THE ACOUSTIC TRANSFER BEHAVIOUR OF PRESSURE DUCTS UTILISED FOR MICROPHONE MEASUREMENTS IN COMBUSTION CHAMBERS
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NUMERICAL ANALYSIS OF THE ACOUSTIC TRANSFER BEHAVIOUR OF PRESSURE DUCTS UTILISED FOR MICROPHONE MEASUREMENTS IN COMBUSTION CHAMBERS

机译：用于燃烧室中麦克风测量的压力管道的声传递行为的数值分析

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摘要

Acoustic measurements within combustion chambers are expensive due to high thermal loads applied on the measurement devices at operating conditions. As a more feasible substitute, pressure ducts can be used to lead acoustic waves from combustion chambers to externally mounted microphones. Since these pressure ducts are purged by nitrogen at atmospheric temperature, high thermal loads are avoided. However, the acoustic signal measured within the pressure ducts is altered compared to the signal within the combustion chamber. This change in the acoustic signal can be characterised by means of the acoustic transfer function of the pressure duct, which mainly depends on the pressure ducts geometry and the combustion chambers temperature distribution. The main subject of the present paper is to analyse the influence of the combustion chambers temperature distribution on the acoustic transfer function of pressure ducts. For this scope, experiments at standard conditions and transient CFD simulations for different temperature distributions have been carried out. The acoustic signal measured in the pressure duct is found to be amplified with increasing temperatures within the combustion chamber. Moreover this amplification grows with increasing frequency of the acoustic signals.
机译：燃烧室内的声学测量由于在操作条件下的测量装置上施加的高热负载而昂贵。作为更可行的替代品，压力管道可用于将来自燃烧室的声波引入外部安装的麦克风。由于在大气温度下通过氮气吹扫这些压力管道，因此避免了高热载荷。然而，与燃烧室内的信号相比，在压力管道内测量的声学信号被改变。声学信号的这种变化可以通过压力管道的声学传递函数来表征，这主要取决于压力管道几何形状和燃烧室温度分布。本文的主要主题是分析燃烧室温度分布对压力管道声学传递函数的影响。对于此范围，已经进行了标准条件和不同温度分布的瞬态CFD模拟的实验。发现在压力管道中测量的声学信号随着燃烧室内的温度的增加而被放大。此外，该放大随着声信号的频率的增加而增长。

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