A multistage frequency domain (time-linearized/nonlinear harmonic) Navier-Stokes unsteady flow solver has been developed for predicting unsteady flows induced by bladerow interactions. In this paper, the time-linearized option of the solver has been used to analyze unsteady flows in a subsonic turbine test stage and the DLR transonic counter-rotating shrouded propfan. The numerical accuracy and computational efficiency of the time-linearized viscous methods have been demonstrated by comparing predictions with test data and nonlinear time-marching solutions for these two test cases. It is concluded that the development of efficient frequency domain approaches enables unsteady flow predictions to be used in the design cycles to tackle aeromechanics problems.
Issue Section:
Technical Papers
Keywords:
gas turbines,
flow instability,
Navier-Stokes equations,
vibrations,
frequency-domain analysis,
subsonic flow
Topics:
Blades,
Flow (Dynamics),
Pressure,
Rotors,
Turbines,
Unsteady flow,
Wakes,
Vibration,
Design
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