...Maximilian Behn; Ulf Tapken For the development of low-noise fan designs the sound generation must be reduced at the source, but also sound transmission effects through the rotor can be exploited to reduce the noise emitted to the far-field. Rotor shielding has been identified as a means of noise...

... map, a fast dynamic pressure sensor to measure the surge-induced pressure fluctuation, and 13 microphones to record the acoustic pressure on the inlet duct wall and in the far field. The transient experimental data were analyzed in time and frequency domains. The noise related to surge is identified...

...Dakun Sun; Jia Li; Xu Dong; Ruize Xu; Xiaofeng Sun A set of foam metal casing treatment (FMCT) has been investigated to assess the stability improvement and noise reduction on an axial compressor. Three FMCTs with different PPI (Pores Per Inch), 20, 35, and 50, are tested experimentally. Two...

..., substantially contributes to high noise levels and pressure losses. In this paper a completed design will be shown that incorporates a new airfoil shape for the struts, and by using CRV flow technology in combination with the LAD flow technology, the pressure recovery can be enhanced. If the pressure losses...

...Konrad Vogeler,; Ronald Mailach, and; Ingolf Lehmann gas turbines compressors rotational flow vortices vibrations noise sensors laser Doppler anemometry pressure measurement The authors thank Prof. Cumpsty for his critical comments. After the discussion in Munich (ASME Turbo...

...R. Mailach; I. Lehmann; K. Vogeler Rotating instabilities (RIs) have been observed in axial flow fans and centrifugal compressors as well as in low-speed and high-speed axial compressors. They are responsible for the excitation of high amplitude rotor blade vibrations and noise generation...