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Research Papers: Gas Turbines: Heat Transfer

Influence of Hot Streak Temperature Ratio on Low 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 100080, Chinaqingjunzhao@163.com

Tang Fei

 Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100080, China; Graduate School of the Chinese Academy of Sciences, P.O. Box 2706, Beijing 100080, China

Wang Huishe, Du Jianyi, Zhao Xiaolu, Xu Jianzhong

 Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100080, China

J. Eng. Gas Turbines Power 130(3), 031901 (Apr 02, 2008) (10 pages) doi:10.1115/1.2836615 History: Received June 13, 2007; Revised October 28, 2007; Published April 02, 2008

In order to explore the influence of hot streak temperature ratio on the low pressure stage of a vaneless counter-rotating turbine, three-dimensional multiblade row unsteady Navier–Stokes simulations have been performed. The predicted results show that hot streaks are not mixed out by the time they reach the exit of the high pressure turbine rotor. The separation of colder and hotter fluids is observed at the inlet of the low pressure turbine rotor. After making interactions with the inner-extending and outer-extending shock waves in the high pressure turbine rotor, the hotter fluid migrates toward the pressure surface of the low pressure turbine rotor, and most of the colder fluid migrates to the suction surface of the low pressure turbine rotor. The migrating characteristics of the hot streaks are dominated by the secondary flow in the low pressure turbine rotor. The results also indicate that the secondary flow intensifies in the low pressure turbine rotor when the hot streak temperature ratio is increased. The effects of the hot streak temperature ratio on the relative flow angle at the inlet of the low pressure turbine rotor are very remarkable. The isentropic efficiency of the vaneless counter-rotating turbine decreases as the hot streak temperature ratio is increased.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Three-dimensional grid topology of the VCRT

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Figure 2

Turbine inlet radial temperature profile

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Figure 3

Critical velocity ratio at the hub of the vane

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Figure 4

Critical velocity ratio at the midspan of the vane

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Figure 5

Critical velocity ratio at the tip of the vane

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Figure 6

Total pressure distribution at the outlet of the turbine

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Figure 7

Total temperature distribution at the outlet of the turbine

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Figure 8

Inlet hot streak profiles

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Figure 9

Instantaneous temperature contours on the midspan of the HPT rotor and LPR

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Figure 10

Span distributions of static temperature dissipated degree in the LPR

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Figure 11

Time-averaged static temperature contours on the LPR

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Figure 12

Instantaneous static temperature and limiting streamlines on the SS of the LPR in the case with a hot streak temperature ratio of 2.0

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Figure 13

Span distributions of time and pitch averaged static temperature at the inlet of the LPR

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Figure 14

Span distributions of time and pitch averaged relative axial velocity at the inlet of the LPR

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Figure 15

Span distributions of time and pitch averaged relative flow angle at the inlet of the LPR

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Figure 16

Span distributions of time and pitch averaged relative flow angle at the outlet of the LPR

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Figure 17

The influence of the hot streak temperature ratio on the total-total efficiency of the VCRT

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