Sensitivity and uncertainty of the radial mode analysis for turbomachinery applications

Authors

J.D. Laguna, M. Bartelt, C. Keller, J.R. Seume - Institute of Turbomachinery and Fluid Dynamics (TFD), Leibniz Universitat Hannover, Germany

Abstract

Air traffic is expected to increase in the coming decades. This leads to a significant burden on residents and on the environment close to airports due to the emitted noise. Therefore, innovative noise reduction concepts applied to airplane engines are required. In the present research, the sound propagation through a low pressure turbine (LPT) is investigated by means of the Radial Mode Analysis (RMA). This method identifies the transmitted sound field within the LPT in form of propagating acoustical modes. Before measurements are carried out, a sensitivity analysis of the parameters influencing the overall error due to the application of the RMA is performed. The results are used to define requirements for a high-quality measurement and support improvements of future setups.