Experimental Investigation of Aerodynamic Performance due to Blade Tip Clearance in a Gas Turbine Rotor Cascade

CHUNG Jinmoo, BAEK Seungchan, HWANG Wontae

热科学学报 ›› 2022, Vol. 31 ›› Issue (1) : 173-178.

PDF(10588 KB)
PDF(10588 KB)
热科学学报 ›› 2022, Vol. 31 ›› Issue (1) : 173-178. DOI: 10.1007/s11630-022-1554-4  CSTR: 32141.14.JTS-022-1554-4
气动

Experimental Investigation of Aerodynamic Performance due to Blade Tip Clearance in a Gas Turbine Rotor Cascade

  • CHUNG Jinmoo1, BAEK Seungchan1, HWANG Wontae1,2,3*
作者信息 +

Experimental Investigation of Aerodynamic Performance due to Blade Tip Clearance in a Gas Turbine Rotor Cascade

  • CHUNG Jinmoo1, BAEK Seungchan1, HWANG Wontae1,2,3*
Author information +
文章历史 +

Abstract

This study examines how the complex flow structure within a gas turbine rotor affects aerodynamic loss. An unshrouded linear turbine cascade was built, and velocity and pressure fields were measured using a 5-hole probe. In order to elucidate the effect of tip clearance, the overall aerodynamic loss was evaluated by varying the tip clearance and examining the total pressure field for each case. The tip clearance was varied from 0% to 4.2% of blade span and the chord length based Reynolds number was fixed at 2×105. For the case without tip clearance, a wake downstream of the blade trailing edge is observed, along with hub and tip passage vortices. These flow structures result in profile loss at the center of the blade span, and passage vortex related losses towards the hub and tip. As the tip clearance increases, a tip leakage vortex is formed, and it becomes stronger and eventually alters the tip passage vortex. Because of the interference of the secondary tip leakage flow with the main flow, the streamwise velocity decreases while the total pressure loss increases significantly by tenfold in the last 30% blade span region towards the tip for the 4.2% tip clearance case. It was additionally observed that the overall aerodynamic loss increases linearly with tip clearance.

Key words

gas turbine / turbine cascade / aerodynamic loss / tip clearance / tip leakage

引用本文

导出引用
CHUNG Jinmoo, BAEK Seungchan, HWANG Wontae. Experimental Investigation of Aerodynamic Performance due to Blade Tip Clearance in a Gas Turbine Rotor Cascade[J]. 热科学学报, 2022, 31(1): 173-178 https://doi.org/10.1007/s11630-022-1554-4
CHUNG Jinmoo, BAEK Seungchan, HWANG Wontae. Experimental Investigation of Aerodynamic Performance due to Blade Tip Clearance in a Gas Turbine Rotor Cascade[J]. Journal of Thermal Science, 2022, 31(1): 173-178 https://doi.org/10.1007/s11630-022-1554-4

参考文献

[1] Nho Y.C., Park J.S., Lee Y.J., Kwak J.S., Effects of turbine blade tip shape on total pressure loss and secondary flow of a linear turbine cascade. International Journal of Heat and Fluid Flow, 2012, 33: 92–100.
[2] Wang T., Xuan Y., Han X., The effects of tip gap variation on transonic turbine blade tip leakage flow based on VLES approach. Aerospace Science and Technology, 2021, 111: 106542.
[3] Yamamoto A., Interaction mechanisms between tip leakage flow and the passage vortex in a linear turbine rotor cascade. Journal of Turbomachinery, 1988, 110(3): 329–338.
[4] Yamamoto A., Production and development of secondary flows and losses in two types of straight turbine cascades: Part 2―A rotor case. Journal of Turbomachinery, 1987, 109(2):186–193.
[5] Ainley D.G., Mathieson G.C.R., A method of performance estimation for axial flow turbines. British ARC, 1951.
[6] Dunham J., Came P.M., Improvements to the Ainley-Mathieson method of turbine performance prediction. Journal of Engineering for Power, 1970, 92: 252–256.
[7] Yaras M.I., Sjolander S.A., Prediction of tip-leakage losses in axial turbines. Journal of Turbomachinery, 1992, 114: 204–210.
[8] Sjolander S.A., Cao D., Measurements of the flow in an idealized turbine tip gap. Journal of Turbomachinery, 1995, 117(4): 578–584.
[9] Williams R., Gregory-Smith D., He L., Ingram G., Experiments and computations on large tip clearance effects in a linear cascade. Proceedings of ASME Turbo Expo, 2008.
[10] Matsunuma T., Effects of Reynolds number and freestream turbulence on turbine tip clearance flow. Journal of Turbomachinery, 2006, 128(1): 166–177.
[11] Bi Z., Shao X., Zhang L., Numerical study of tip leakage vortex around a NACA0009 hydrofoil. Journal of Fluids Engineering, 2021, 143: 051203.
[12] Tallman J., Lakshminarayana B., Numerical simulation of tip leakage flows in axial flow turbines, with emphasis on flow physics: Part 1―Effect of tip clearance height. Journal of Turbomachinery, 2001, 123(2): 314–323.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
PDF(10588 KB)

51

Accesses

0

Citation

Detail

段落导航
相关文章

/