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Research Papers

Tip Clearance Effects on Inlet Hot Streak Migration Characteristics in High Pressure Stage of a Vaneless Counter-Rotating Turbine

[+] Author and Article Information
Zhao Qingjun

Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100190, Chinazhaoqingjun@mail.etp.ac.cn

Du Jianyi, Wang Huishe, Zhao Xiaolu, Xu Jianzhong

Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100190, China

J. Turbomach 132(1), 011005 (Sep 15, 2009) (8 pages) doi:10.1115/1.3103925 History: Received June 17, 2008; Revised February 18, 2009; Published September 15, 2009

In this paper, three-dimensional multiblade row unsteady Navier–Stokes simulations at a hot streak temperature ratio of 2.0 have been performed to reveal the effects of rotor tip clearance on the inlet hot streak migration characteristics in high pressure stage of a vaneless counter-rotating turbine. The numerical results indicate that the migration characteristics of the hot streak in the high pressure turbine rotor are dominated by the combined effects of secondary flow, buoyancy, and leakage flow in the rotor tip clearance. The leakage flow trends to drive the hotter fluid toward the blade tip on the pressure surface and to the hub on the suction surface. Under the effect of the leakage flow, even partial hotter fluid near the pressure surface is also driven to the rotor suction surface through the tip clearance. Compared with the case without rotor tip clearance, the heat load of the high pressure turbine rotor is intensified due to the effects of the leakage flow. And the results indicate that the leakage flow effects trend to increase the low pressure turbine rotor inlet temperature at the tip region. The air flow with higher temperature at the tip region of the low pressure turbine rotor inlet will affect the flow and heat transfer characteristics in the downstream low pressure turbine.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Meridional section of the VCRT with rotor tip clearance

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Figure 2

H–O–H grid topologies of the VCRT

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Figure 3

Turbine inlet radial temperature profile

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Figure 4

Critical velocity ratio at the hub of the vane

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Figure 5

Critical velocity ratio at the midspan of the vane

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Figure 6

Critical velocity ratio at the tip of the vane

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Figure 7

Total pressure distribution at the outlet of the turbine

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Figure 8

Total temperature distribution at the outlet of the turbine

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Figure 9

Inlet hot streak profile (cases 1 and 2)

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Figure 10

Instantaneous Mach number contours on the midspan section of the HPT rotor

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Figure 11

Instantaneous static temperature contour on the midspan section of the HPT—case 1

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Figure 12

HPT rotor blade tip leakage flow

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Figure 13

Instantaneous temperature contour on a cross section (S3 section) of the HPT rotor passage—case 2

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Figure 14

Time-averaged static temperature contour on the HPT rotor (case 1)

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Figure 15

Secondary flow streamline distributions on a S3 section of the HPT rotor passage

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Figure 16

Time-averaged static temperature contour on the HPT rotor (case 2)

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Figure 17

Time-averaged relative total temperature contours on some S3 sections of the HPT rotor passage

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Figure 18

Time-averaged relative total temperature contours on three S3 sections of the HPT rotor passage—case 2

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Figure 19

Instantaneous temperature contour at the LPR inlet—case 1

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Figure 20

Instantaneous temperature contour at the LPR inlet—case 2

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