IGTC-20 Evaluation of Unsteady Blade Loading Signals during Stall and its Inception in Centrifugal Compressors(Session A-7 CENTRIFUGAL COMPRESSOR II)

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概要

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• Unsteady blade loading signals during rotating stall and its inception are experimentally studied in centrifugal compressors. The aims of this study are twofold. The first is to understand the fundamental differences between the two forms of stall inception: global modal wave and localized stall cell. The second is to address the monitoring strategy of rotating stall by an evaluation of its unsteady blade loading signals. The test was carried out in a speed range of 12000-16000rpm, with a radially-bladed impeller as well as a back-swept one. Extensive pressure transducers were used to study the frequency characteristics of full stall and their precursors. In addition to the conventional on-line frequency spectra for the blade passing signals, frequency amplitudes of these signals are analyzed for the occurrence of different internal flow structure within a single stall period. Comparative study for different type of stall and its precursor has revealed that the inception process of stall cells can be clearly observed by the formation of two distinguished blade passage flow patterns and the corresponding reduction of the amplitude of blade loading signals for the stalled pattern. But for modal-wave-like inception process, such formation could not be observed. The underlying mechanism of this difference has been discussed, with supporting interpretations from internal pressure field analysis and blade vibration measurement. The test result also shows that although the blade loading signals do have the decreasing tendency at stall, the margin is not very certain to be useful for the stall monitoring. This result can be explained by combined effect of different blade passage flow patterns during stall occurrence in centrifugal compressors.

• 公益社団法人日本ガスタービン学会の論文

著者

• Rautenberg M.

  Institut For Turbomachinery University Of Hannover

• Chen J.

  Institute Of Microelectronics And Department Of Electrical Engineering National Cheng Kung Universit

• Hasemann H.

  Institute of Turbomachinery, University of Hannover

• Shi L.

  Institute of Engineering Thermophysics, Chinese Academy of Science

• Hasemann H.

  Institute Of Turbomachinery University Of Hannover

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