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Research Papers: Gas Turbines: Turbomachinery

Numerical Analysis on the Impact of Interstage Flow Addition in a High-Pressure Steam Turbine

[+] Author and Article Information
Soo Young Kang

Industrial Science and Technology Research Institute,
Inha University,
Incheon 22212, Korea
e-mail: koeier@naver.com

Jeong Jin Lee

Graduate School Inha University,
Incheon 22212, Korea
e-mail: stgo89@naver.com

Tong Seop Kim

Mem. ASME
Department of Mechanical Engineering,
Inha University,
Incheon 22212, Korea
e-mail: kts@inha.ac.kr

Seong Jin Park

Turbine/Generator Performance Team,
Doosan Heavy Industries & Construction,
Changwon 51711, Korea
e-mail: seongjin.park@doosan.com

Gi Won Hong

Gas Turbine Development Team,
Doosan Heavy Industries & Construction,
Changwon 51711, Korea
e-mail: giwon.hong@doosan.com

1Present address: Doosan Heavy Industries & Construction, Changwon, Korea.

2Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 20, 2017; final manuscript received October 24, 2017; published online February 21, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(6), 062604 (Feb 21, 2018) (9 pages) Paper No: GTP-17-1522; doi: 10.1115/1.4038769 History: Received September 20, 2017; Revised October 24, 2017

This study analyzes the fluid dynamic characteristics of an ultrasupercritical (USC) high-pressure turbine with additional steam supplied through an overload valve between the second and third stages. The mixing between the main and admission flows causes complex flow phenomena such as swirl and changes of velocity vectors of the main flow. This causes a pressure drop between the second-stage outlet and third-stage inlet, which could potentially affect the performance of the turbine. First, a single-passage computational analysis, which is usually preferred in predicting the performance of multistage turbomachines, was performed using a simple model of an admission flow path and a single passage (SP) for the second and third stages of the turbine. However, the actual flow in the overload valve is supplied through the admission flow path, which has the shape of a casing that circumferentially surrounds the turbine, after flowing in two directions perpendicular to the turbine axis. This necessitates full-passage computational analyses of the two stages and the flow paths of the admission flow. To achieve this, we implemented a full three-dimensional (3D) geometric model of the admission flow path and conducted a full-passage computational analysis for all the flow paths, including those of the second and third stages of the turbine. The focus of analysis was on the pressure drop due to the admission flow. The results of the single and full-passage analyses were compared, and the effects of two different methods were analyzed.

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References

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Figures

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Fig. 11

Velocity profile of the third stage for a flow ratio of 0% (midspan, SP analysis)

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Fig. 12

Velocity profile of the third stage for a flow ratio of 19.5% (midspan, SP analysis)

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Fig. 13

Static pressure contour of the third stage inlet for a flow ratio of 0% (SP analysis)

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Fig. 14

Static pressure contour of the third stage inlet for a flow ratio of 19.5% (SP analysis)

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Fig. 15

Entropy contour of the third stage inlet for a flow ratio of 0% (SP analysis)

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Fig. 16

Entropy contour of the third stage inlet for a flow ratio of 19.5% (SP analysis)

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Fig. 10

Velocity vectors for a flow ratio of 19.5% (SP analysis)

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Fig. 9

Velocity vectors for a flow ratio of 0% (SP analysis)

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Fig. 8

Pitch angle dependence test for the FP analysis of the third stage

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Fig. 7

Validation of CFD results

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Fig. 6

Grid dependence test for the FP analysis

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Fig. 5

Grid dependence test for the SP analysis

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Fig. 4

Computational grid of the FP analysis

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Fig. 3

Computational grid of the SP analysis

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Fig. 2

Configuration of the second and third stages and the admission flow path for the full passage analysis (stator vanes are omitted)

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Fig. 1

Configuration of the second and third stages and the admission flow path for the single passage analysis

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Fig. 17

Velocity vectors for a flow ratio of 0% (FP analysis)

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Fig. 18

Velocity vectors for a flow ratio of 19.5% (FP analysis)

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Fig. 19

Velocity profile of the third stage for a flow ratio of 0% (midspan, FP analysis)

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Fig. 20

Velocity profile of the third stage for a flow ratio of 19.5% (midspan, FP analysis)

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Fig. 21

Static pressure contour of the third stage inlet for a flow ratio of 0 and 19.5% (FP analysis)

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Fig. 22

Entropy contour of the third stage inlet for a flow ratio of 0 and 19.5% (FP analysis)

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Fig. 23

Pressure variations at the second stage outlet and the third stage inlet

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Fig. 24

Variation in pressure loss

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Fig. 25

Variation in mass flow rate of each stage

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