CUED Publications database

Multi-fidelity simulation for a transonic compressor with inflow distortions

Cui, J and Ma, Y and Ubald, B and Tucker, P (2017) Multi-fidelity simulation for a transonic compressor with inflow distortions. In: ISROMAC 2017 International Symposium on Transport Phenomena and Dynamics of Rotating Machinery Maui, Hawaii (5 pages, extended abstract), 2017-12-16 to 2017-12-21.

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Abstract

The low and high fidelity methods are used to study a transonic fan case. This transonic fan case features a distortion generator upstream of the rotor. The low fidelity methods (immersed boundary method and immersed boundary method with smeared geometry) show promising results against hi-fi simulation (unsteady RANS) and experiments. The flow in the tip region, especially the interaction between the distorted inflow and tip leakage flow, are investigated in detail. It is found that the tip leakage flow is the dominant flow structure near the casing. It is strong enough to sustain even at the exit of the stator. Apart from analysing the tip leakage flow structures, the stalling mechanism is also explored. As mass flow decreases, more rotor blades are contaminated by the distorted flow. A rotating cell starts to develop shortly after all the rotor blade passages are contaminated. The rotating cell is found to be swept in circumferential direction at the 65% speed of the rotor.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 29 Jan 2019 01:12
Last Modified: 07 Sep 2021 02:11
DOI: