Global stability analysis of an idealized compressor blade row. II. Multiple-blade interactions

Journal article

A direct-adjoint mean flow global stability investigation of self-excited instabilities in an idealized, two-dimensional compressor blade row at off-design conditions is carried out. In this second part of the paper, the single-passage analysis is extended to multiblade passages by exploiting the properties of block-circulant matrices and Bloch-wave theory. By using this method, analyses for a large number of blade passages become computationally tangible, and the modal and nonmodal single-passage analysis from the first part of the paper can be augmented by considering multiblade effects arising in larger systems. This work shows that multiblade passages introduce additional unstable 10- and five-periodic synchronization structures arising from a tuned optimal phase relationship that is supported by the larger system. Self-excited low-frequency structures, which cannot be represented within a single-passage computation, are also uncovered and analyzed.

Authors: Glazkov, A; de Pando, MF; Schmid, PJ; He, L

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review Fluids
• Volume: 8
• Issue: 10
• Article number: 103904
• Publication date: 2023-10-11
• Acceptance date: 2023-05-25
• DOI: 10.1103/PhysRevFluids.8.103904
• EISSN: 2469-990X
• Language: English
• Keywords: fluid dynamics; FFR; flow instability; aeroacoustics