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Aeroacoustic characteristics of the axial compressor stage with tandem impeller

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Category: Geotechnical and mining mechanical engineering, machine building

Last Updated on 20 March 2019

Published on 03 March 2019

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Authors:

Е.V.Doroshenko, Cand. Sc. (Tech.), orcid.org/0000-0001-6495-3263, National Aviation University, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Yu.M.Tereshchenko, Dr. Sc. (Tech.), Prof., orcid.org/0000-0003-4367-3232, National Aviation University, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Yu.Yu.Tereshchenko, Cand. Sc. (Tech.), orcid.org/0000-0002-1908-0923, National Aviation University, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

А.O.Kushchinskiy, orcid.org/0000-0002-0175-8767, National Aviation University, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Comparative evaluation of aeroacoustic characteristics of the axial compressor stages with a single and equivalent tandem impeller.

Methodology. The research was performed using the numerical experiment. The flow parameters in the stage of the axial compressor were calculated by solving the non-stationary system of Navier – Stokes equations. The equations were closed by the model of turbulent viscosity SST. The stage of the compressor consisted of inlet guide vanes, the impeller and the guide vanes. The impeller of the modified axial compressor stage is designed as an equivalent tandem row. Acoustic sources of the axial compressor stage were calculated using the Ffowcs Williams – Hawkings equation.

Findings. The results of a comparative evaluation of the aeroacoustic characteristics of the axial compressor stages with a single and equivalent double-row impeller are obtained. The use of a tandem row instead of an equivalent single row in the impeller of the axial compressor stage makes it possible to increase the pressure ratio by 1‒15 %. In the design mode, the pressure ratio is increased by 8.5 %. A stage with a tandem impeller has greater acoustic efficiency than a compressor stage with a single impeller. The obtained results demonstrate a significant decrease in the acoustic pressure of the dipole source. In the design mode, the acoustic pressure of the dipole source decreases by more than 70 %, the acoustic pressure of the quadrupole source decreases by more than 10 %.

Originality. For the first time the results of a comprehensive study of the aerodynamic and acoustic characteristics of the axial compressor stage were obtained. The results allow estimating the efficiency of application of tandem row in the impeller of the low loaded subsonic stage of the axial compressor.

Practical value. The received recommendations can be used while designing impeller machines with a low level of acoustic emission.

References.

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