LES and RANS Investigations Into Buoyancy-Affected Convection in a Rotating Cavity With a Central Axial Throughflow

Sun, Zixiang; Lindblad, Klas; Chew, John W.; Young, Colin

doi:10.1115/gt2006-90251

Cited by 23 publications

(17 citation statements)

References 24 publications

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“…Bohn et al [28] simulated their rig [20] with a laminar, compressible, time-dependent flow solver, confirming the experimentally observed flow structures rotating slower than the discs. Sun et al [29] reported LES and URANS calculations of Long et al's [21] experiment, with LES showing better agreement with the measurements (within 25%) than URANS, in terms of the shroud Nu. Tian et al [30] reported adequate prediction results of Farthing et al's [19] experiment, through steady state simulations.…”

Section: Open Rotating Cavity With Axial Throughflowmentioning

confidence: 99%

Ekman Layer Scrubbing and Shroud Heat Transfer in Centrifugal Buoyancy-Driven Convection

Gao

Chew

2021

Journal of Engineering for Gas Turbines and Power

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This paper presents large-eddy and direct numerical simulations of buoyancy-driven convection in sealed and open rapidly rotating cavities for Rayleigh numbers in the range 107-109, and axial throughflow Reynolds numbers 2000 and 5600. Viscous heating due to the Ekman layer scrubbing effect, which has previously been found responsible for the difference in sealed cavity shroud Nusselt number predictions between a compressible N-S solver and an incompressible counterpart using the Boussinesq approximation, is discussed and scaled up to engine conditions. For the open cavity with an axial throughflow, laminar Ekman layer behaviour of the mean flow statistics is confirmed up to the highest condition in this paper. The Buoyancy number Bo is found useful to indicate the influence of an axial throughflow. For the conditions studied the mean velocities are subject to Ra, while the velocity fluctuations are affected by Bo. A correlation, Nu0 = 0:169(Ra0)0:318, obtained with both the sealed and open cavity shroud heat transfer solutions, agrees with that for free gravitational convection between horizontal plates within 16% for the range of Ra0 considered. NOMENCLATURE

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Section: Open Rotating Cavity With Axial Throughflowmentioning

confidence: 99%

Ekman Layer Scrubbing and Shroud Heat Transfer in Centrifugal Buoyancy-Driven Convection

Gao

Chew

2021

Journal of Engineering for Gas Turbines and Power

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“…23 and Sun et al. 24 The Hydra 3D model solution was similar to the axisymmetric case except on “Line-2” and for x/x o > 1.04, in Figure 15. This was due to the presence of the holes in the 3D model.…”

Section: Cfd Modelsmentioning

confidence: 63%

Coupled FE–CFD thermal analysis for a cooled turbine disk

Javiya

Chew

Hills

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents transient aero-thermal analysis for a gas turbine disk and the surrounding air flows through a transient slam acceleration/deceleration "square cycle" engine test, and compares predictions with engine measurements. The transient solid-fluid interaction calculations were performed with an innovative coupled finite element (FE) and computational fluid dynamics (CFD) approach. The computer model includes an aero-engine high pressure turbine (HPT) disk, adjacent structure, and the surrounding internal air system cavities. The model was validated through comparison with the engine temperature measurements and is also compared with industry standard standalone FE modelling. Numerical calculations using a 2D FE model with axisymmetric and 3D CFD solutions are presented and compared. Strong coupling between CFD solutions for different air system cavities and the FE solid model led to some numerical difficulties. These were addressed through improvement to the coupling algorithm. Overall performance of the coupled approach is very encouraging giving temperature predictions as good as a traditional model that had been calibrated against engine measurements.

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“…The flow field may exhibit large counter-rotating vortices (cyclonic and anti-cyclonic regions) with their axis parallel to the axis of rotation. Evidence of these macro-structures can be found in the experiments of Farthing et al [2], Bohn et al [3], Günther et al [4] or in the numerical simulations of Tian et al [5], Sun et al [6], Puttock-Brown et al [7] and Owen et al [8].…”

Section: Introductionmentioning

confidence: 93%

Heat Transfer Prediction From Large Eddy Simulation of a Rotating Cavity With Radial Inflow

Onori

Amirante

Hills

et al. 2019

Journal of Engineering for Gas Turbines and Power

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This paper describes a large eddy simulation (LES) conducted for a nonadiabatic rotating cavity with a radial inflow introduced from the shroud. The dimensionless mass flowrate of the radial inflow is Cw = 3500 and the rotational Reynolds number, based on the cavity outer radius, is equal to Reθ=1.2×106. The time-averaged local Nusselt number on the heated wall is compared with the experimental data available from the literature, and with those derived from the solution of two unsteady Reynolds-averaged Navier–Stokes (URANS) eddy viscosity models, namely, the Spalart–Allmaras and the k−ω shear stress transport (SST) model. It is shown that the Nusselt number is underpredicted in the lower part of the disk and overpredicted in the outer region by both URANS models, whereas the LES provides a much better agreement with the measurements. The behavior results primarily from a different flow structure in the source region, which, in the LES, is found to be considerably more extended and show localized buoyancy phenomena that the URANS models investigated do not capture.

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LES and RANS Investigations Into Buoyancy-Affected Convection in a Rotating Cavity With a Central Axial Throughflow

Abstract: The buoyancy-affected flow in rotating disk cavities, such as occurs in compressor disk stacks, is known to be complex and difficult to predict. In the present work, large eddy simulation (LES) and unsteady Reynolds-averaged Navier-Stokes (RANS)

Cited by 23 publications

References 24 publications

Ekman Layer Scrubbing and Shroud Heat Transfer in Centrifugal Buoyancy-Driven Convection

Ekman Layer Scrubbing and Shroud Heat Transfer in Centrifugal Buoyancy-Driven Convection

Coupled FE–CFD thermal analysis for a cooled turbine disk

Heat Transfer Prediction From Large Eddy Simulation of a Rotating Cavity With Radial Inflow

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