Evaluation of actuator disk theory for predicting indirect combustion noise

Ashish Mishra, Daniel J. Bodony

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Indirect combustion noise is believed to be a key component of turbofan engine core noise, but existing experimental data have not been able to definitively determine its importance. Instead, actuator disk theory (ADT) as developed by Cumpsty & Marble (Proceedings of the Royal Society of London A, 357, pp. 323-344, 1977), is commonly used to estimate its contribution based on combustor exit conditions and changes in the mean flow across blade rows. The theory, which assumes planar propagation of acoustic, entropic, and vortical waves in the long wavelength limit, is assessed by comparing its predictions to those from two-dimensional compressible Euler calculations of idealized entropy disturbances interacting with a 1980s era NASA turbine stator. Both low-frequency planar waves of constant frequency and higher-frequency, localized entropy disturbances are considered, with the former being within ADT's range of applicability and the latter outside of it. It is found that ADT performs well for the cut-on acoustic modes generated by the entropy-blade interaction but it's accuracy suffers for the cut-off acoustic modes, which could impact indirect combustion noise predictions for turbines with closely spaced blade rows.

Original languageEnglish (US)
Title of host publication18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference)
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781600869327
DOIs
StatePublished - 2012
Event18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference) - , United States
Duration: Jun 4 2012Jun 6 2012

Publication series

Name18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference)

Other

Other18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference)
CountryUnited States
Period6/4/126/6/12

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Acoustics and Ultrasonics

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