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Large-eddy simulation of unsteady turbine rim sealing flows

Gao, Feng, Chew, John, Beard, Paul F., Amirante, Dario and Hills, Nicholas (2018) Large-eddy simulation of unsteady turbine rim sealing flows International Journal of Heat and Fluid Flow, 70. pp. 160-170.

Large-eddy simulation of unsteady turbine rim sealing flows.pdf - Accepted version Manuscript

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Unsteady flow phenomena unrelated to the main gas-path blading have been identified in a number of turbine rim seal investigations. This unsteadiness has significant influence on the sealing effectiveness predicted by the conventional steady RANS (Reynolds-averaged Navier–Stokes) method, thus it is important for turbine stage design and optimisation. This paper presents CFD (computational fluid dynamics) modelling of a chute type rim seal that has been previously experimentally investigated. The study focuses on inherent large-scale unsteadiness rather than that imposed by vanes and blades or external flow. A large-eddy simulation (LES) solver is validated for a pipe flow test case and then applied to the chute rim seal rotor/stator cavity. LES, RANS and unsteady RANS (URANS) models all showed reasonable agreement with steady measurements within the disc cavity, but only the LES shows unsteadiness at a similar distinct peak frequency to that found in the experiment, at 23 times the rotational frequency. The boundary layer profile within the chute rim seal clearance has been scrutinised, which may explain the improvement of LES over RANS predictions for the pressure drop across the seal. LES results show a clockwise mean flow vortex. A more detailed sketch of the rim sealing flow unsteady flow structures is established with the help of the LES results. However, there are some significant differences between unsteadiness predicted and the measurements, and possible causes of these are discussed.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Beard, Paul F.
Date : 23 February 2018
DOI : 10.1016/j.ijheatfluidflow.2018.02.002
Copyright Disclaimer : © 2018 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Turbine rim seal; Chute seal; Unsteady flow structures; Large-eddy simulation; Taylor-Couette instability
Related URLs :
Depositing User : Clive Harris
Date Deposited : 07 Feb 2018 15:11
Last Modified : 24 Feb 2019 02:08

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