The Design of Curved Endwall with Leading-edge Deformation

Zhang Xuyang

doi:doi:10.11648/j.ijepe.20200901.11

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The Design of Curved Endwall with Leading-edge Deformation

Zhang Xuyang

Published in International Journal of Energy and Power Engineering (Volume 9, Issue 1)

Received: 22 December 2019 Accepted: 30 December 2019 Published: 27 January 2020

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Abstract

The inlet boundary layer separates in front of the leading edge of the blade on the endwall and forms the pressure side leg of horseshoe vortex and the suction side one. The pressure side leg of the horseshoe vortex immediately moves toward to the suction side and form a stronger vortex, ”passage vortex”, in the cascade. These vortices mentioned above are called secondary flows which will result in an increase of secondary flow losses and a reduction of stage efficiency. In this paper, the flow characteristics are analyzed in the leading edge region and inside the cascade based on the numerical simulation results of the Langston cascade. A new type endwall design method, curved endwall structure combined with the deformation in the leading edge region, is established and optimized. It can be observed that the new structure can efficiently reduce the strength of the horseshoe vortex and suppress the generation of the leading edge separation line and saddle point. The uses of the new structure also decrease the pressure gradient between the pressure side and the suction side in the streamline direction, which suppresses the deviation of the pressure side horseshoe vortex from the pressure side of the endwall to the suction side and delays the formation position of the passage vortex. The rate of increase in the total pressure loss coefficient along the mainstream direction also decreases 25.34% in the exit of the cascade.

Published in	International Journal of Energy and Power Engineering (Volume 9, Issue 1)
DOI	10.11648/j.ijepe.20200901.11
Page(s)	1-10
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2020. Published by Science Publishing Group

Keywords

NURBS, Secondary Flow, Leading-edge Position, Curved Endwall

References

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[7]	SAUER H, MÜLLER R, VOGELER K. Reduction of Secondary Flow Losses in Turbine Cascades by Leading Edge Modifications at the Endwall [J]. Journal of Turbomachinery, 2001, 123 (2): 207-13.
[8]	SHIH T I P, LIN Y L. Controlling Secondary-Flow Structure by Leading-Edge Airfoil Fillet and Inlet Swirl to Reduce Aerodynamic Loss and Surface Heat Transfer [J]. Journal of Turbomachinery, 2003, 125 (1): 48-56.
[9]	WEI Z J, QIAO W Y, LIU J, et al. Reduction of endwall secondary flow losses with leading-edge fillet in a highly loaded low-pressure turbine [J]. Proceedings of the Institution of Mechanical Engineers Part A Journal of Power & Energy, 2016, 230 (2).
[10]	SANGSTON K, LITTLE J, LYALL M E, et al. End Wall Loss Reduction of High Lift Low Pressure Turbine Airfoils Using Profile Contouring—Part II: Validation; proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, F, 2014 [C].
[11]	LYALL M E, KING P I, CLARK J P, et al. Endwall Loss Reduction of High Lift Low Pressure Turbine Airfoils Using Profile Contouring: Part I — Airfoil Design; proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, F, 2014 [C].
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[15]	TAREMI F, SJOLANDER S A, PRAISNER T J. Application of Endwall Contouring to Transonic Turbine Cascades: Experimental Measurements at Design Conditions; proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, F, 2011 [C].
[16]	ROSE M G. Non-Axisymmetric Endwall Profiling in the HP NGV’s of an Axial Flow Gas Turbine; proceedings of the ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, F, 1994 [C].
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[18]	BERGH J, SNEDDEN G, MEYER C. Optimization of Non-Axisymmetric End Wall Contours for the Rotor of a Low Speed, 1 1/2 Stage Research Turbine With Unshrouded Blades; proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, F, 2012 [C].
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APA Style

Zhang Xuyang. (2020). The Design of Curved Endwall with Leading-edge Deformation. International Journal of Energy and Power Engineering, 9(1), 1-10. https://doi.org/10.11648/j.ijepe.20200901.11

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ACS Style

Zhang Xuyang. The Design of Curved Endwall with Leading-edge Deformation. Int. J. Energy Power Eng. 2020, 9(1), 1-10. doi: 10.11648/j.ijepe.20200901.11

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AMA Style

Zhang Xuyang. The Design of Curved Endwall with Leading-edge Deformation. Int J Energy Power Eng. 2020;9(1):1-10. doi: 10.11648/j.ijepe.20200901.11

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@article{10.11648/j.ijepe.20200901.11,
  author = {Zhang Xuyang},
  title = {The Design of Curved Endwall with Leading-edge Deformation},
  journal = {International Journal of Energy and Power Engineering},
  volume = {9},
  number = {1},
  pages = {1-10},
  doi = {10.11648/j.ijepe.20200901.11},
  url = {https://doi.org/10.11648/j.ijepe.20200901.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20200901.11},
  abstract = {The inlet boundary layer separates in front of the leading edge of the blade on the endwall and forms the pressure side leg of horseshoe vortex and the suction side one. The pressure side leg of the horseshoe vortex immediately moves toward to the suction side and form a stronger vortex, ”passage vortex”, in the cascade. These vortices mentioned above are called secondary flows which will result in an increase of secondary flow losses and a reduction of stage efficiency. In this paper, the flow characteristics are analyzed in the leading edge region and inside the cascade based on the numerical simulation results of the Langston cascade. A new type endwall design method, curved endwall structure combined with the deformation in the leading edge region, is established and optimized. It can be observed that the new structure can efficiently reduce the strength of the horseshoe vortex and suppress the generation of the leading edge separation line and saddle point. The uses of the new structure also decrease the pressure gradient between the pressure side and the suction side in the streamline direction, which suppresses the deviation of the pressure side horseshoe vortex from the pressure side of the endwall to the suction side and delays the formation position of the passage vortex. The rate of increase in the total pressure loss coefficient along the mainstream direction also decreases 25.34% in the exit of the cascade.},
 year = {2020}
}

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TY  - JOUR
T1  - The Design of Curved Endwall with Leading-edge Deformation
AU  - Zhang Xuyang
Y1  - 2020/01/27
PY  - 2020
N1  - https://doi.org/10.11648/j.ijepe.20200901.11
DO  - 10.11648/j.ijepe.20200901.11
T2  - International Journal of Energy and Power Engineering
JF  - International Journal of Energy and Power Engineering
JO  - International Journal of Energy and Power Engineering
SP  - 1
EP  - 10
PB  - Science Publishing Group
SN  - 2326-960X
UR  - https://doi.org/10.11648/j.ijepe.20200901.11
AB  - The inlet boundary layer separates in front of the leading edge of the blade on the endwall and forms the pressure side leg of horseshoe vortex and the suction side one. The pressure side leg of the horseshoe vortex immediately moves toward to the suction side and form a stronger vortex, ”passage vortex”, in the cascade. These vortices mentioned above are called secondary flows which will result in an increase of secondary flow losses and a reduction of stage efficiency. In this paper, the flow characteristics are analyzed in the leading edge region and inside the cascade based on the numerical simulation results of the Langston cascade. A new type endwall design method, curved endwall structure combined with the deformation in the leading edge region, is established and optimized. It can be observed that the new structure can efficiently reduce the strength of the horseshoe vortex and suppress the generation of the leading edge separation line and saddle point. The uses of the new structure also decrease the pressure gradient between the pressure side and the suction side in the streamline direction, which suppresses the deviation of the pressure side horseshoe vortex from the pressure side of the endwall to the suction side and delays the formation position of the passage vortex. The rate of increase in the total pressure loss coefficient along the mainstream direction also decreases 25.34% in the exit of the cascade.
VL  - 9
IS  - 1
ER  -

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Author Information

Zhang Xuyang

CSIC 704 Research Institute, Shanghai, China

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Plain Text BibTeX RIS

APA Style

Zhang Xuyang. (2020). The Design of Curved Endwall with Leading-edge Deformation. International Journal of Energy and Power Engineering, 9(1), 1-10. https://doi.org/10.11648/j.ijepe.20200901.11

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ACS Style

Zhang Xuyang. The Design of Curved Endwall with Leading-edge Deformation. Int. J. Energy Power Eng. 2020, 9(1), 1-10. doi: 10.11648/j.ijepe.20200901.11

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AMA Style

Zhang Xuyang. The Design of Curved Endwall with Leading-edge Deformation. Int J Energy Power Eng. 2020;9(1):1-10. doi: 10.11648/j.ijepe.20200901.11

Copy | Download

@article{10.11648/j.ijepe.20200901.11,
  author = {Zhang Xuyang},
  title = {The Design of Curved Endwall with Leading-edge Deformation},
  journal = {International Journal of Energy and Power Engineering},
  volume = {9},
  number = {1},
  pages = {1-10},
  doi = {10.11648/j.ijepe.20200901.11},
  url = {https://doi.org/10.11648/j.ijepe.20200901.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20200901.11},
  abstract = {The inlet boundary layer separates in front of the leading edge of the blade on the endwall and forms the pressure side leg of horseshoe vortex and the suction side one. The pressure side leg of the horseshoe vortex immediately moves toward to the suction side and form a stronger vortex, ”passage vortex”, in the cascade. These vortices mentioned above are called secondary flows which will result in an increase of secondary flow losses and a reduction of stage efficiency. In this paper, the flow characteristics are analyzed in the leading edge region and inside the cascade based on the numerical simulation results of the Langston cascade. A new type endwall design method, curved endwall structure combined with the deformation in the leading edge region, is established and optimized. It can be observed that the new structure can efficiently reduce the strength of the horseshoe vortex and suppress the generation of the leading edge separation line and saddle point. The uses of the new structure also decrease the pressure gradient between the pressure side and the suction side in the streamline direction, which suppresses the deviation of the pressure side horseshoe vortex from the pressure side of the endwall to the suction side and delays the formation position of the passage vortex. The rate of increase in the total pressure loss coefficient along the mainstream direction also decreases 25.34% in the exit of the cascade.},
 year = {2020}
}

Copy | Download

TY  - JOUR
T1  - The Design of Curved Endwall with Leading-edge Deformation
AU  - Zhang Xuyang
Y1  - 2020/01/27
PY  - 2020
N1  - https://doi.org/10.11648/j.ijepe.20200901.11
DO  - 10.11648/j.ijepe.20200901.11
T2  - International Journal of Energy and Power Engineering
JF  - International Journal of Energy and Power Engineering
JO  - International Journal of Energy and Power Engineering
SP  - 1
EP  - 10
PB  - Science Publishing Group
SN  - 2326-960X
UR  - https://doi.org/10.11648/j.ijepe.20200901.11
AB  - The inlet boundary layer separates in front of the leading edge of the blade on the endwall and forms the pressure side leg of horseshoe vortex and the suction side one. The pressure side leg of the horseshoe vortex immediately moves toward to the suction side and form a stronger vortex, ”passage vortex”, in the cascade. These vortices mentioned above are called secondary flows which will result in an increase of secondary flow losses and a reduction of stage efficiency. In this paper, the flow characteristics are analyzed in the leading edge region and inside the cascade based on the numerical simulation results of the Langston cascade. A new type endwall design method, curved endwall structure combined with the deformation in the leading edge region, is established and optimized. It can be observed that the new structure can efficiently reduce the strength of the horseshoe vortex and suppress the generation of the leading edge separation line and saddle point. The uses of the new structure also decrease the pressure gradient between the pressure side and the suction side in the streamline direction, which suppresses the deviation of the pressure side horseshoe vortex from the pressure side of the endwall to the suction side and delays the formation position of the passage vortex. The rate of increase in the total pressure loss coefficient along the mainstream direction also decreases 25.34% in the exit of the cascade.
VL  - 9
IS  - 1
ER  -

Copy | Download