Abstract
In this article, the nonlinear harmonic method implemented in Fine/Turbo code has been evaluated for unsteady rotor–rotor interaction analysis. Strengths and weaknesses of the nonlinear harmonic method are highlighted through direct comparison with experimental data and time-domain unsteady simulation for the Northwestern Polytechnical University counter-rotating research compressor at the design and off-design conditions. The rotor–rotor interactions were studied in detail to advance the understanding of the flow physics involved. Based on the unsteady simulation, deterministic stresses were computed and compared to the nonlinear harmonic method to analyze distinct sources of unsteadiness and their effect on the time-averaged flow field. For the present case, the nonlinear harmonic method efficiently computes unsteady flows and shows major improvements regarding the computational time (to a factor up to 10).
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