Acoustic resonance in a high-speed axial compressor [Elektronische Ressource] / von Bernd Hellmich

ACOUSTIC RESONANCE IN A HIGH-SPEED AXIAL COMPRESSOR ACOUSTIC RESONANCE IN A HIGH-SPEED AXIAL COMPRESSOR Der Fakultät für Maschinenbau der Gottfried Wilhelm Leibniz Universität Hannover zur Erlangung des akademischen Grades Doktor-Ingenieur genehmigte Dissertation von Dipl.-Phys. Bernd Hellmich geboren am 23.11.1970 in Rahden/Westfalen, Deutschland 2008 I ACOUSTIC RESONANCE IN A HIGH-SPEED AXIAL COMPRESSOR Referent: Prof. Dr.-Ing. Jörg Seume Korreferent: Prof. Dr.-Ing. Wolfgang Neise Vorsitzender: Prof. Dr.-Ing. Peter Nyhuis Tag der Promotion: 12.11.2007 II ACOUSTIC RESONANCE IN A HIGH-SPEED AXIAL COMPRESSOR „Das Chaos ist aufgebraucht, es war die beste Zeit“ B. Brecht Für Bettina III ACOUSTIC RESONANCE IN A HIGH-SPEED AXIAL COMPRESSOR IV ACOUSTIC RESONANCE IN A HIGH-SPEED AXIAL COMPRESSOR 1. Abstract 1. Abstract Non-harmonic acoustic resonance was detected in the static pressure and sound signals in a four-stage high-speed axial compressor when the compressor was operating close to the surge limit. The amplitudes of the resonant acoustic mode are in a range comparable to the normally dominating blade passing frequency. This has led to blade cracks in the inlet guided vanes of the compressor where the normal mechanical and aerodynamic load is low.