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Synergy Methodology for Internal Flow of Turbomachinery

  • Xin Zhou
  • Zhitao ZuoEmail author
  • Qi Liang
  • Hucan Hou
  • Hongtao Tang
  • Haisheng Chen
Article

Abstract

The complex curvature of turbomachinery rotor blade channels combined with strong rotational effect and clearance leakage brings on intricate internal flow phenomenon. It is necessary to study the internal flow and energy loss mechanism to reveal the influence law of the key parameters and to achieve its optimal design. Considering features of flow and temperature fields in rotor passage, the concept of synergy analysis derived from equation of energy conservation was put forward. Typical NASA low-speed centrifugal compressor (LSCC) rotor was chosen for analysis using CFD. Numerical results showed remarkable agreement with experiment datum in both the tendency of the performance characteristics and quantitative pressure values. Under different flow rates and inlet total temperatures conditions, thermal-fluid interaction effect and losses were studied by synergy analysis. Results showed that peak synergy positive value zones located around blade leading edge, across the shroud wall and hub wall, and at the position where tip-leakage flow was mixing with the bulk flow and high entropy zones existed. Increasing flow rate from design condition, positive and negative synergy areas both changed tiny around leading edge and trailing edge. Reducing flow rate, positive synergy areas tended to increase and negative areas decreased at same positions. The relationship between flow separation, heat transfer and losses in turbomachinery rotor can be revealed based on synergy analyses.

Keywords

thermal-fluid interaction internal flow turbomachinery energy losses numerical simulation 

Nomenclature

A

area/m2

Cp

specific heat at constant pressure/J·kg−1·K−1

J

position of section

k

thermal conductivity/W·m−1·K−1

m

meridional coordinal/mm

n

face normal vector

P

pressure/Pa

Pr

pressure ratio

Q

mass flowrate/kg·s−1

\({\dot q}\)

internal heat source/W·m−3

r

radius/m

T

temperature/K

t

time/s

u

velocity vector

u

velocity in x direction/m·s−1

V

volume/m3

Vm

meridional velocity/m·s−1

v

velocity in y direction/m·s−1

w

velocity in z direction/m·s−1

Greek symbols

α

synergy angle/°

γ

ratio of specific heats

λ

bulk viscosity coefficient/Pa·s

μ

kinetic viscosity coefficient/Pa·s

ρ

density/kg·m−3

Φ

dissipation term

ω

rotation speed/s−1

Subscripts

1

inlet

2

outlet

i

index, 1, 2, 3

s

blade span

+

positive area

negative area

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Notes

Acknowledgements

The present research was carried out under the support from the National Key R&D Plan (Grant No. 2017YFB0903602), the Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA21070200), the Frontier Science Research Project of CAS (Grant No. QYZDB-SSW-JSC023), and International Partnership Program, Bureau of International Cooperation of Chinese Academy of Sciences (Grant No. 182211KYSB20170029).

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Xin Zhou
    • 1
  • Zhitao Zuo
    • 1
    Email author
  • Qi Liang
    • 1
  • Hucan Hou
    • 1
  • Hongtao Tang
    • 1
  • Haisheng Chen
    • 1
  1. 1.Institute of Engineering ThermophysicsChinese Academy of SciencesBeijingChina

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