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Effects of inlet circumferential fluctuation on the sweep aerodynamic performance of axial fans/compressors

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Abstract

Swept blades have been widely used in the transonic fan/compressor of aircraft engines with the aids of 3D CFD simulation since the design concept of controlling the shock structure was firstly proposed and successfully tested by Dr. Wennerstrom in the 1980s. However, some disadvantage phenomenon has also been induced by excessively 3D blade geometries on the structure stress insufficiency, vibration and reliability. Much confusion in the procedure of design practice leading us to recognize a new view on the flow mechanism of sweep aerodynamical induction: the new radial equilibrium established by the influence of inlet circumferential fluctuation (CF) changes the inlet flows of blading and induces the performance modification of axial fans/compressors blade. The view is verified by simplified models through numerical simulation and circumferentially averaged analysis in the present paper. The results show that the CF source items which originate from design parameters, such as the spanwise distributions of the loading and blading geometries, contribute to the changing of averaged incidence spanwise distribution, and further more affect the performance of axial fans/compressors with swept blades.

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Abbreviations

L.E. :

leading edge

T.E. :

trailing edge

x :

axial coordinate(m)

r :

radial coordinate(m)

m :

streamline coordinate(m)

w :

relative velocity(m/s)

v :

absolute velocity(m/s)

p :

static pressure(Pa)

e:

total energy per mass(j/kg)

i:

enthalpy per mass(j/kg)

q :

heat flux(j/kg)

N :

number of blades

ρ :

density(kg/m3)

τij :

viscous stress tensor (kg/m2/s2)

φ :

circumferential angle(rad)

ω:

angular speed(rad/s)

σ :

streamline lean angle(rad)

x :

axial direction

r :

radial direction

u :

circumferential direction

m :

streamline direction

p :

pressure surface

s :

suction surface

″:

circumferential fluctuation

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Authors and Affiliations

  1. Aero-Engine Simulation Research Center, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    Xingmin Gui, Fang Zhu, Ke Wan & Donghai Jin

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  1. Xingmin Gui
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  2. Fang Zhu
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Financially supported by National Natural Science Foundation of China (grant number: 51236001).

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Gui, X., Zhu, F., Wan, K. et al. Effects of inlet circumferential fluctuation on the sweep aerodynamic performance of axial fans/compressors. J. Therm. Sci. 22, 383–394 (2013). https://doi.org/10.1007/s11630-013-0640-z

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  • DOI: https://doi.org/10.1007/s11630-013-0640-z

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