scholarly journals Heat Transfer Analysis in a Rotating Cavity With Axial Through-Flow

2021 ◽  
Author(s):  
Mark R. Puttock-Brown ◽  
Christopher Long
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Analysis ◽  
Rotating Cavity ◽  
Through Flow

scholarly journals Heat Transfer Analysis in a Rotating Cavity with Axial Through-Flow

2021 ◽  
Author(s):  
Mark R Puttock-Brown ◽  
C. A. Long
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Analysis ◽  
Nusselt Numbers ◽  
Analysis Methodology ◽  
Rotating Cavity ◽  
Through Flow ◽  
Stress Relieving ◽  
Inverse Solutions ◽  
Steady State Heat ◽  
The University

Abstract This paper presents local Nusselt numbers computed from experimental measurements of surface temperature of compressor discs in a multiple rotating cavity test rig with axial throughflow. A validated 2D steady state heat conduction analysis methodology is presented, using the actual test geometry, and 95% confidence intervals calculated using Monte Carlo simulation. Sensitivity of the solution to curve fitting types, geometric simplification and surface instrumentation are explored. The results indicate that polynomial curves fits, whilst computational simple, are unsuitable especially at higher orders. It is shown that geometric simplifications, that typically simplify the algorithmic implementation, may also omit significant variation in heat flux at critical stress relieving locations. The effect of reducing measurement points in the analysis is to both over-predict heat transfer and increase the uncertainty of the results. Finally, the methodology is applied to previously published thermal data from the University of Sussex, facilitating qualitative discussion on the influence of the governing parameters. Whilst this study does not overcome the inherent uncertainty associated with inverse solutions it is intended to present a methodology that is readily available to the wider community for the analysis of thermal test data and suggests some guidelines at the planning and post-processing stages.

scholarly journals Heat Transfer Analysis in a Rotating Cavity With Axial Through-Flow

2020 ◽  
Author(s):  
M. R. Puttock-Brown ◽  
C. A. Long
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Analysis ◽  
Nusselt Numbers ◽  
Analysis Methodology ◽  
Rotating Cavity ◽  
Through Flow ◽  
Stress Relieving ◽  
Inverse Solutions ◽  
Steady State Heat ◽  
The University

Abstract This paper presents local Nusselt numbers computed from experimental measurements of surface temperature of compressor discs in a multiple rotating cavity test rig with axial through-flow. A validated 2D steady state heat conduction analysis methodology is presented, using the actual test geometry, and 95% confidence intervals calculated using Monte Carlo simulation. Sensitivity of the solution to curve fitting types, geometric simplification and surface instrumentation are explored. The results indicate that polynomial curves fits, whilst computational simple, are unsuitable especially at higher orders. It is shown that geometric simplifications, that typically simplify the algorithmic implementation, may also omit significant variation in heat flux at critical stress relieving locations. The effect of reducing measurement points in the analysis is to both over-predict heat transfer and increase the uncertainty of the results. Finally, the methodology is applied to previously published thermal data from the University of Sussex, facilitating qualitative discussion on the influence of the governing parameters. Whilst this study does not overcome the inherent uncertainty associated with inverse solutions it is intended to present a methodology that is readily available to the wider community for the analysis of thermal test data and suggests some guidelines at the planning and post-processing stages. The range of experiment reported here covers: 1.13 × 105 < Rez < 5.14 × 105, 1.65 × 106 < Reθ < 3.16 × 106, 0.10 < Ro < 0.60 and 3.40 × 1011 < Gr < 1.25 × 1012.

Disk Heat Transfer Analysis in a Heated Rotating Cavity With an Axial Throughflow

2012 ◽  
Author(s):  
Shuqing Tian ◽  
Yatao Zhu
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Rotating Disk ◽  
Outer Wall ◽  
Heat Transfer Analysis ◽  
Outlet Temperature ◽  
Rotating Cavity ◽  
Isothermal Boundary ◽  
Aero Engines ◽  
Cooling Air

In the rotating disk cavities of aero-engine compressors, buoyancy-induced flow and heat transfer can occur due to thermal gradients between cooling air and hot surfaces. The simplified rotating cavity with two plane discs, a shaft and a cylindrical rim has been investigated numerically and compared with the available measurements. Two models have been solved using a commercial CFD code, Fluent, with the RNG k-ε turbulence model. The first one is the conventional model with only fluid region solved, a temperature profile with the linear radial gradient imposed at the disk walls, and an isothermal boundary condition imposed at the shroud wall. The second one is the model with thick-walled disks and shroud, an adiabatic boundary condition imposed at the outer walls of the disks, and an isothermal boundary condition imposed at the outer wall of the shroud. The fluid and solid are coupled solved simultaneously. The disk temperatures are computed. In the present work, the numerical results are in reasonable agreement with the measurements. The computed disk temperatures in the second model have approximately linear radial gradients over the first three-quarters of the disks, and in the last quarter of the disks the temperature radial gradients are obviously non-linear. The different disk temperature profiles in these two models do not lead to obviously different disk heat transfers. The heat transfer in the rotating cavity leads to a considerable temperature increase of the cavity core fluid, therefore a corresponding increase of the outlet temperature. These two temperature increases are critical for the cooling design in aero-engines.

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