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Effect of clocking on compressor noise generation

Accepted version
Peer-reviewed

Type

Article

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Authors

Milidonis, K 
Semlitsch, Bernhard  ORCID logo  https://orcid.org/0000-0001-7715-863X
Hynes, T 

Abstract

The effect of stator clocking on the acoustic noise generation characteristics in an axial high-pressure compressor is analysed. A realistic geometry with one-and-a-half stages is assessed using high fidelity and low-order numerical methods for different clocking positions at approach operating conditions. The compressor efficiency and the acoustic noise emission is found to vary insignificantly between the simulated clocking configurations. Nonetheless, the pressure distribution is altered significantly right upstream of the inlet guide vanes. Although the cut-on modes exhibit at least 10 dB higher amplitudes, the cut-off modes contribute decisively to the wave pattern in the near field. Optimal acoustic liner design can expand on the differently evolving interference pattern of acoustic waves at discrete frequencies. The low-order model is found to predict the directionality of the acoustic waves and the cut-on criteria for the individual modes in excellent agreement with the high fidelity simulations. However, the phase cannot be estimated due to the simplicity of the low-order formulation.

Description

Keywords

4015 Maritime Engineering, 40 Engineering

Journal Title

AIAA Journal

Conference Name

Journal ISSN

0001-1452
1533-385X

Volume Title

56

Publisher

American Institute of Aeronautics and Astronautics (AIAA)
Sponsorship
Technology Strategy Board (113013)
The authors wish to express their sincere gratitude to Rolls-Royce plc for the permission to publish this paper, which partly developed through the Rolls-Royce plc and Innovate UK Aerospace Technology Institute funded research programme, ACAPELLA.