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Flows in Complex Systems

Flow Analysis and Assessment of Loss Models in the Symmetric Volute of a Turbo-Blower

[+] Author and Article Information
Semi Kim

Department of Mechanical Engineering,  Pohang University of Science and Technology (POSTECH), San31, Hyoja-dong, Nam-gu, Pohang 790-784, Korea

Junyoung Park, Bumseok Choi

KIMM, Sinseongno, Yuseong-gu, Daejeon 305-343, Korea

Jehyun Baek1

Department of Mechanical Engineering,  Pohang University of Science and Technology (POSTECH), San31, Hyoja-dong, Nam-gu, Pohang 790-784, Koreajhbaek@postech.ac.kr

1

Corresponding author.

J. Fluids Eng 134(1), 011101 (Feb 09, 2012) (9 pages) doi:10.1115/1.4005670 History: Received June 23, 2011; Revised November 24, 2011; Published February 08, 2012; Online February 09, 2012

The objectives of the present study were to investigate the flow structure and assess the accuracy of loss correlations in the symmetric volute of a turbo-blower using 3D steady flow analysis methods. To accurately model the flow field in the volute, an impeller with a single blade, a diffuser with 13 vanes, and a volute were used as the calculation domains for the computational fluid dynamics (CFD) simulations. Numerical results were validated by comparison with experimental results for the performance of a turbo-blower operated under three operating conditions: high (0.38 kg/s), normal (0.3 kg/s), and low (0.23 kg/s) mass flow rates. The accuracy of the loss correlation sets reported in four previous studies was compared with the CFD simulation predictions. These comparisons showed that the correlation sets did not accurately represent the total pressure loss in the symmetric volute of a turbo-blower, and a modified correlation set that included adjustments for the loss coefficients was proposed. Detailed investigations of the simulated flow fields were compared to understand the flow characteristics in the volute under the designed operating conditions.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Meridional view of a turbo-blower

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Figure 2

Front view of a turbo-blower

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Figure 3

Circumferential variations in the ratio of the volute cross-sectional area to the diffuser exit area (Area ration), and the ratio of the volute centroid radius to the diffuser exit radius (Radius ratio)

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Figure 4

Surface grid of a turbo-blower

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Figure 5

Cross-sectional grid in the volute exit plane

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Figure 7

Comparisons of the total pressure ratios in the experiment and CFD simulation

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Figure 8

Cp , ω, and 1−(ω + Cp ) as a function of the mass flow rate

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Figure 9

Total loss by the correlation sets and CFD simulations, as a function of the mass flow rate

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Figure 10

Meridional velocity dump and friction losses

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Figure 11

Tangential velocity dump loss

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Figure 13

Total pressure losses predicted by the correlation sets, the CFD simulation, and the suggested correlation set

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Figure 14

Swirl velocity vectors at 8 planes for M77%, M100%, and M127%

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Figure 15

Throughflow velocity contours at 8 planes for M77%, M100%, and M127%

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Figure 16

Cp contours at 8 planes for M77%, M100%, and M127%

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Figure 17

ω contours at 8 planes for M77%, M100%, and M127%

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