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This work explores rotating instability (RI) in axial and radial turbomachines, particularly in axial compressors near the stability line, where high efficiencies are typically achievable. The presence of RI leads to increased acoustic emissions, reduced efficiency, and significant pressure fluctuations, which can induce blade vibrations and mechanical failures due to high cycle fatigue. To prevent RI and harness the compressor system's efficiency, a comprehensive understanding of the flow phenomena is essential. The literature offers numerous descriptions of RI characteristics. After introducing the theoretical aspects of axial compressor systems and relevant flow phenomena, the fundamentals of computational fluid dynamics (CFD) are discussed. The application of CFD to flow through an annular compressor cascade is detailed, followed by validation of RI occurrence in flow simulations. A hypothesis regarding the mechanism behind the characteristic pressure fluctuations of RI is formulated from in-depth analyses of simulation data. The identified flow configuration is modeled using fundamental solutions from potential theory. Temporal integration of these modeled flow states reveals a fluid dynamic akin to RI. The calculated pressure and velocity fluctuations meet the criteria for detecting RI, thereby substantiating the hypothesis about the pressure fluctuation mechanism and enhancing the understanding of the complex flow pheno
Achat du livre
Numerical simulation and modelling of sound generated by rotating instabilities in an annular compressor cascade, Ruben van Rennings
- Langue
- Année de publication
- 2016
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