Non-Linear Time and Frequency Domain Methods for Multi-Row Aeromechanical Analysis

Mohammad Rahmati, L. He, D. X. Wang, R. G. Wells, S. K. Krishnababu

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

6 Citations (Scopus)


An unsteady Navier-Stokes solution system for aeromechanical analysis of multiple blade row configurations is presented. A distinctive feature of the solver is that unified numerical methods and boundary condition treatments are consistently used for both a nonlinear time-domain solution mode and a frequency-domain one. This not only enables a wider range of physical aeromechanical problems to be tackled, but also provides a consistent basis for validating different computational models, identifying and understanding their relative merits and adequate working ranges. An emphasis of the present work is on a highly efficient frequency-domain method for multi-row aeromechanic analysis. With a new interface treatment, propagations and reflections of pressure waves between adjacent blade rows are modeled within a domain consisting of only a single passage in each blade row. The computational model and methods are firstly described. Then, extensive validations of the frequency-domain method against both experimental data and the nonlinear time-domain solutions are described. Finally the computational analysis and demonstration of the intra-row reflection effects on the rotor aerodynamic damping are presented.
Original languageEnglish
Title of host publicationASME Turbo Expo 2012:
Subtitle of host publicationTurbine Technical Conference and Exposition
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages13
ISBN (Print)9780791844731
Publication statusPublished - 11 Jun 2012
Externally publishedYes
EventASME Turbo Expo 2012: Turbine Technical Conference and Exposition - Copenhagen, Denmark
Duration: 11 Jun 201215 Jun 2012


ConferenceASME Turbo Expo 2012
Internet address


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