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The Analysis of the Noise Generation in Gas Turbine Stage

机译:燃气轮机阶段产生的噪声分析

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The aim of this paper is to assess the impact of the mutual positioning of the turbine stage stator and rotor blades on noise generation. The Ansys CFX commercial software package and the Scale-Adaptive Simulation (SAS) hybrid turbulence model are used for numerical analyses. The paper is focused on an analysis that the pressure wave generation resulting from unsteady flow phenomena. In order to present the problem, the Fast Fourier Transformation (FFT) analysis of pressure fluctuation is carried out at selected points of the turbine stage computational domain. A comparison of values of individual components for subsequent control points allows an approximate determination of the place of generation of pressure waves, the direction of their propagation and the damping rate. Moreover, the numerical analyses make it possible to evaluate the justification for the use of the SAS model, which is rather demanding in terms of equipment, in simulations of unsteady flow fields where generation and propagation of noise waves occur.
机译:本文的目的是评估涡轮级定子和转子叶片相互定位对噪声产生的影响。 Ansys CFX商业软件包和比例自适应仿真(SAS)混合湍流模型用于数值分析。本文着重于分析由不稳定流动现象产生的压力波。为了解决这个问题,在涡轮级计算域的选定点进行了压力波动的快速傅立叶变换(FFT)分析。通过比较后续控制点的各个分量的值,可以大致确定压力波的产生位置,其传播方向和阻尼率。此外,数值分析使得可以评估使用SAS模型的合理性,这在设备方面要求很高,可用于模拟产生噪声波产生和传播的非恒定流场。

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