Effect of Radial Location of Nozzles on Heat Transfer in Pre-Swirl Cooling System

Kakade, Vinod; Lock, Gary; Wilson, Mike; Owen, J. Michael; Mayhew, James E.

doi:10.1115/gt2009-59090

Cited by 5 publications

(3 citation statements)

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“…Modified and extended versions of this model have been presented and used by Chew et al [8] and Javiya et al [10]. Heat transfer measurements on the rotor disk obtained with the thermochromic liquid crystal technique at the University of Bath have been published by Lock et al [11] and Kakade et al [12][13][14][15]. Corresponding numerical investigations are given by Yan et al [15], Farzaneh et al [16], Lewis et al [17] and Javiya et al [18].…”

Section: Introductionmentioning

confidence: 95%

Evaluation of Computational Fluid Dynamics and Coupled Fluid-Solid Modeling for a Direct Transfer Preswirl System

Javiya¹,

Chew²,

Hills

et al. 2013

Journal of Engineering for Gas Turbines and Power

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The prediction of the preswirl cooling air delivery and disk metal temperature are important for the cooling system performance and the rotor disk thermal stresses and life assessment. In this paper, standalone 3D steady and unsteady computation fluid dynamics (CFD), and coupled FE-CFD calculations are presented for prediction of these temperatures. CFD results are compared with previous measurements from a direct transfer preswirl test rig. The predicted cooling air temperatures agree well with the measurement, but the nozzle discharge coefficients are under predicted. Results from the coupled FE-CFD analyses are compared directly with thermocouple temperature measurements and with heat transfer coefficients on the rotor disk previously obtained from a rotor disk heat conduction solution. Considering the modeling limitations, the coupled approach predicted the solid metal temperatures well. Heat transfer coefficients on the rotor disk from CFD show some effect of the temperature variations on the heat transfer coefficients. Reasonable agreement is obtained with values deduced from the previous heat conduction solution.

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Section: Introductionmentioning

confidence: 95%

Evaluation of Computational Fluid Dynamics and Coupled Fluid-Solid Modeling for a Direct Transfer Preswirl System

Javiya¹,

Chew²,

Hills

et al. 2013

Journal of Engineering for Gas Turbines and Power

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“…where is actual outlet flow angle. By equations (3) and (5), together with ignoring the difference between id and act , can be expressed as…”

Section: Theoretical Analysismentioning

confidence: 99%

“…There have been a large number of experimental and numerical studies on the pre-swirl nozzle as well as the pre-swirl system [1][2][3][4][5][6][7] to understand their flow and heat transfer processes. Meierhofer and Franklin 1 analyzed the influences of nozzle number, vane height and other factors on the flow characteristics in the pre-swirl nozzle, and they were the first to use the pre-swirl effectiveness to characterize the nozzle.…”

Section: Introductionmentioning

confidence: 99%

A new design of vane-shaped hole pre-swirl nozzle

Liu

Kong

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part A:

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Theoretical analysis shows that the temperature drop of a pre-swirl system directly relates to the pre-swirl effectiveness of the pre-swirl nozzle. Besides, increasing the discharge coefficient and reducing the actual flow angle are the main ways to increase the pre-swirl effectiveness. A new design of pre-swirl nozzle called vane-shaped hole nozzle was introduced and analyzed in this paper. By keeping the throat area, the radial location and the pre-swirl angle (15), numerical comparisons were carried out between the vane-shaped hole nozzle and other three typical nozzles, widely used in industry: simple drilled nozzle, aerodynamic nozzle and cascade vane nozzle. In order to involve the mixing and rotating effects in the pre-swirl cavity downstream of the nozzles, the rotating pre-swirl cavity and receiver hole were included in the computational models. Numerical results show that aerodynamic nozzle could alleviate the rapid acceleration and deflection at nozzle inlet, which results in 13.7% higher discharge coefficient than the simple drilled nozzle. The discharge coefficient of the cascade vane nozzle can be as high as 0.97 due to the aerodynamical design; however, the pre-swirl effectiveness is only 0.86 because of a large deviation angle (2.4). For the vane-shaped hole nozzle, the vane height/pitch ratio could be flexibly adjusted to an appropriate value, which makes its performance better than that of the traditional ones. Higher vane height/pitch ratio and close to zero trailing edge radius lead to a small deviation angle (0.56). Consequently, the pre-swirl effectiveness of the vane-shaped hole nozzle is about 8% higher than that of the cascade vane nozzle, though the discharge coefficient is about 5% lower. Additionally, the volume of the solid block in the vaneshaped hole nozzle is larger than that in the cascade vane nozzle, which could reduce the difficulty in manufacturing but increase the total weight.

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CFD Analysis of Flow and Heat Transfer in a Direct Transfer Preswirl System

Javiya

Chew

Hills

et al. 2011

Journal of Turbomachinery

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The accuracy of computational fluid dynamics (CFD) for the prediction of flow and heat transfer in a direct transfer preswirl system is assessed through a comparison of CFD results with experimental measurements. Axisymmetric and three-dimensional (3D) sector CFD models are considered. In the 3D sector models, the preswirl nozzles or receiver holes are represented as axisymmetric slots so that steady state solutions can be assumed. A number of commonly used turbulence models are tested in three different CFD codes, which were able to capture all of the significant features of the experiments. A reasonable quantitative agreement with experimental data for static pressure, total pressure, and disk heat transfer is found for the different models, but all models gave results that differ from the experimental data in some respect. The more detailed 3D geometry did not significantly improve the comparison with experiment, which suggests deficiencies in the turbulence modeling, particularly in the complex mixing region near the preswirl nozzle jets. The predicted heat transfer near the receiver holes was also shown to be sensitive to near-wall turbulence modeling. Overall, the results are encouraging for the careful use of CFD in preswirl-system design.

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Effect of Radial Location of Nozzles on Heat Transfer in Pre-Swirl Cooling System

Cited by 5 publications

References 0 publications

Evaluation of Computational Fluid Dynamics and Coupled Fluid-Solid Modeling for a Direct Transfer Preswirl System

Evaluation of Computational Fluid Dynamics and Coupled Fluid-Solid Modeling for a Direct Transfer Preswirl System

A new design of vane-shaped hole pre-swirl nozzle

CFD Analysis of Flow and Heat Transfer in a Direct Transfer Preswirl System

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