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Research Papers

Experimental and Numerical Study of Honeycomb Tip on Suppressing Tip Leakage Flow in Turbine Cascade

[+] Author and Article Information
Yunfeng Fu

School of Energy Science and Engineering,
Harbin Institute of Technology,
P.O. Box 458, 92 West Dazhi Street,
Nan Gang District,
Harbin 150001, Heilongjiang, China
e-mail: Leefyyf@163.com

Fu Chen

School of Energy Science and Engineering,
Harbin Institute of Technology,
P.O. Box 458, 92 West Dazhi Street,
Nan Gang District,
Harbin 150001, Heilongjiang, China
e-mail: chenfu@hit.edu.cn

Huaping Liu

School of Energy Science and Engineering,
Harbin Institute of Technology,
P.O. Box 458, 92 West Dazhi Street,
Nan Gang District,
Harbin 150001, Heilongjiang, China
e-mail: hgdlhp@163.com

Yanping Song

School of Energy Science and Engineering,
Harbin Institute of Technology,
P.O. Box 458, 92 West Dazhi Street,
Nan Gang District,
Harbin 150001, Heilongjiang, China
e-mail: songyanping@hit.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received November 20, 2017; final manuscript received January 3, 2018; published online April 30, 2018. Editor: Kenneth Hall.

J. Turbomach 140(6), 061006 (Apr 30, 2018) (10 pages) Paper No: TURBO-17-1217; doi: 10.1115/1.4039049 History: Received November 20, 2017; Revised January 03, 2018

In this paper, the effect of a novel honeycomb tip on suppressing tip leakage flow in turbine cascade has been experimentally and numerically studied. Compared to the flat tip cascade with 1%H blade height, the relative leakage flow in honeycomb tip cascade reduces from 3.05% to 2.73%, and the loss also decreases by 8.24%. For honeycomb tip, a number of small vortices are rolled up in the regular hexagonal honeycomb cavities to dissipate the kinetic energy of the clearance flow, and the fluid flowing into and out the cavities create aerodynamic interceptions to the upper clearance flow. As a result, the flow resistance in the clearance increased and the velocity of leakage flow reduced. As the gap height increases, the tip leakage flow and loss changes proportionally, but the growth rate in the honeycomb tip cascade is smaller. Considering its wear resistance of the honeycomb seal, a smaller gap height is allowed in the cascade with honeycomb tip, and that means honeycomb tip has better effect on suppressing leakage flow. Part honeycomb tip structure also retains the effect of suppressing leakage flow. It shows that locally convex honeycomb tip has better suppressing leakage flow effect than the whole honeycomb tip, but locally concave honeycomb tip is slightly less effective.

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References

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Figures

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Fig. 8

Vorticity isosurface for case A (CFD): (a) 0%H gap height and (b) 1%H gap height

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Fig. 6

Distribution of measuring points (a) blade surface, (b) cascade exit, and (c) endwall

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Fig. 5

Honeycomb tip structures

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Fig. 4

Linear turbine cascade

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Fig. 15

Static pressure coefficient distribution along blade surface: (a) midspan and (b) tip

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Fig. 16

Secondary flow streamline in tip region (CFD): (a) 35%Cax, (b) 65%Cax, (c) 80%Cax, and (d) 99%Cax

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Fig. 3

Various structures of blade tip: (a) flat tip, (b) honeycomb tip, (c) locally concave honeycomb tip, and (d) locally convex honeycomb tip

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Fig. 2

Schematic of honeycomb tip

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Fig. 19

Variation of leakage flow rate with gap height (CFD)

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Fig. 1

Schematic of blade profile

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Fig. 9

Oil flow visualization of flat tip cascade (EXP): (a) 0%H gap height and (b) 1%H gap height

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Fig. 10

Distribution of energy loss coefficient and secondary flow streamline at 110%Cax (EXP): (a) 0%H gap height and (b) 1%H gap height

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Fig. 11

Three-dimensional streamline in blade tip region (CFD): (a) case A and (b) case B

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Fig. 23

Energy loss coefficient distribution at cascade exit (EXP): (a) case A, (b) case B, (c) case C, and (d) case D

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Fig. 12

Radial distribution of velocity on either side of the clearance (CFD): (a) pressure side and (b) suction side

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Fig. 13

Contours of static pressure coefficient on endwall (EXP): (a) case A and (b) case B

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Fig. 14

Contours of static pressure coefficient on endwall (CFD): (a) case A and (b) case B

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Fig. 17

Energy loss coefficient distribution at cascade exit of 110%Cax (EXP): (a) case A and (b) case B

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Fig. 18

Energy loss coefficient distribution at cascade exit of 130%Cax (EXP): (a) case A (b) case B

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Fig. 20

Variation of energy loss coefficient at exit with gap height (EXP)

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Fig. 21

Exit energy loss coefficient (EXP): (a) case A and (b) case B

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Fig. 22

Comparison of leakage flow and exit loss

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