Transient heat transfer and temperatures in closed compressor rotors

Nicholas, Tom; Scobie, James A.; Lock, Gary; Tang, Hongxiao

doi:10.1016/j.applthermaleng.2023.120759

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…The computed temperatures are presented in Figure 9, alongside steady-state experimental data and theoretical core temperatures from Jackson et al [16] and Nicholas et al [27]. Cases 2 and 4 compare constant 𝛽Δ𝑇 at low and high Re 𝜙 respectively, but the conjugate model successfully captured the radial distribution and gradient of both disc and core temperature for the four experimental cases (Cases 1-4).…”

Section: Conjugate Thermal Modellingmentioning

confidence: 87%

“…Assuming heat transfer via conductive laminar Ekman layers (see Tang and Owen [4]), the Type VIII boundary condition was used to approximate this heat transfer to a free convection boundary. An ambient adjacent cavity temperature was derived using core temperature correlations by Nicholas et al [27] and a cumulative heat transfer coefficient given by ℎ ′ 𝑑−𝑎𝑑 𝑗 in Equation 14:…”

Section: Description Of the Conjugate Modelmentioning

confidence: 99%

“…Figure 10 shows the radial variation of computed nondimensional wall heat flux given using Equation 23. Theoretical correlations from Nicholas et al [27] are presented for comparison. Near the shroud of the cavity, a positive heat flux shows the discs transferring heat to the cavity.…”

Section: Conjugate Thermal Modellingmentioning

confidence: 99%

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Conjugate Modelling of a Closed Co-Rotating Compressor Cavity

Parry,

Tang,

Scobie

et al. 2023

Volume 7B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Coo

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Robust methods to predict heat transfer are vital to accurately control the blade-tip clearance in compressors and the radial growth of the discs to which these blades are attached. Fundamentally, the flow in the cavity between the co-rotating discs is a conjugate problem: the temperature gradient across this cavity drives large-scale buoyant structures in the core that rotate asynchronously to the discs, which in turn governs the heat transfer and temperature distributions in the discs. The practical engine designer requires expedient computational methods and low-order modelling. A conjugate heat transfer methodology that can be used as a predictive tool is introduced here. Most simulations for rotating cavities only consider the fluid domain in isolation and typically require known disc temperature distributions as the boundary condition for the solution. This paper presents a novel coupling strategy for the conjugate problem, where unsteady Reynolds Averaged Navier-Stokes (URANS) simulations for the fluid are combined with a series of steady simulations for the solid domain in an iterative approach. This strategy overcomes the limitations due to the difference in thermal inertia between fluid and solid; the method retains the unsteady flow features but allows a prediction of the disc temperature distributions, rather than using them as a boundary condition. This approach has been validated on the fundamental flow configuration of a closed co-rotating cavity. Metal temperatures and heat transfer correlations predicted by the simulation are compared to those measured experimentally for a range of engine-relevant conditions.

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Section: Conjugate Thermal Modellingmentioning

confidence: 87%

Section: Description Of the Conjugate Modelmentioning

confidence: 99%

See 1 more Smart Citation

Conjugate Modelling of a Closed Co-Rotating Compressor Cavity

Parry,

Tang,

Scobie

et al. 2023

Volume 7B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Coo

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Analysis of transient heat conduction in tubes under convective boundary conditions

Camaraza‐Medina,

Hernandez‐Guerrero,

Luviano‐Ortiz

2024

Heat Trans

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In this work, six analytical solutions are given to estimate the energy exchange by transient conduction in pipes with convection conditions. The developed models were adjusted for an interval from 0.2 to 0.8, dimensionless Fourier (Fo) and Biot (Bi) numbers, from 0.05 to 50 and 0.005 to 50, respectively. In each case, 616 tests of temperature distributions were computed using the Heisler approximate method (HAM) and the exact models proposed, for different combinations of . For the comparison made between the analytical solutions and the HAM, 3696 tests were used, detecting that the HAM correlates with the analytical method with an average deviation of and for 71.2%, and 90.4% of the different values of combinations evaluated. The best fit was found for Case 5, with a mean deviation of and for 81.1% and 92.3% of the data used, respectively, while the weaker fit was detected for Case 2, with a mean deviation of and for 67.9% and 88.2% of the available tests.

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Analytical modelling of transient conduction heat transfer in tubes for industrial applications

Camaraza-Medina

2024

J Therm Anal Calorim

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Transient heat transfer and temperatures in closed compressor rotors

Cited by 10 publications

References 28 publications

Conjugate Modelling of a Closed Co-Rotating Compressor Cavity

Conjugate Modelling of a Closed Co-Rotating Compressor Cavity

Analysis of transient heat conduction in tubes under convective boundary conditions

Analytical modelling of transient conduction heat transfer in tubes for industrial applications

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