A Mixed-Fidelity Numerical Study for Fan-Distortion Interaction
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
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Ma, Y., Cui, J., Vadlamani, R., & Tucker, P. (2018). A Mixed-Fidelity Numerical Study for Fan-Distortion Interaction. JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, 140 (9. ARTN 091003)https://doi.org/10.1115/1.4040860
Inlet distortion often occurs at off-design points when a flow separates within an intake and this unsteady phenomenon can seriously impact fan performance. Fan-distortion interaction is a highly unsteady aerodynamic phenomenon into which high-fidelity simulations can provide detailed insights. However, due to computational resource limitations, the use of an eddy resolving method for a fully resolved fan calculation is currently infeasible within industry. To solve this problem, a mixed-fidelity CFD method is proposed. This method uses the Large Eddy Simulation (LES) approach to resolve the turbulence associated with separation, and the Immersed Boundary Method with Smeared Geometry (IBMSG) to model the fan. The method is validated by an experiment on the Darmstadt Rotor, which shows a good agreement in terms of total pressure distributions. A detailed investigation is then conducted for a subsonic rotor with an annular beam-generating inlet distortion. A number of studies are performed in order to investigate the fan's influence on the distortions. A comparison to the case without a fan shows that the fan has a significant effect in reducing distortions. Three fan locations are examined which reveal that the fan nearer to the inlet tends to have a higher pressure recovery. Three beams with different heights are also tested to generate various degrees of distortion. The results indicate that the fan can suppress the distortions and that the recovery effect is proportional to the degree of inlet distortion.
External DOI: https://doi.org/10.1115/1.4040860
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286145