Abstract
A numerical simulation of the flow in axial fans with single and tandem geometrically equivalent blade rows was carried out. During the research, the sound power level of the fans was calculated. The acoustic characteristics of the single fan obtained in the numerical experiment were compared with the results of the physical experiment. The divergence between the results of the physical and numerical experiments on the sound power level for the first harmonic is 0.08 %, for the second harmonic – 0.35 %. In order to reduce the acoustic emission, a 3D model of the axial fan with the geometrically equivalent tandem row was constructed. The results showed that at the fan rotation frequency of 900 rpm, the sound power level on the first two harmonics is reduced by more than 7 dB. Also, the change in the total sound power level for axial single and tandem fans in the rotation frequency range of 900 to 1,500 rpm was investigated. The fan with the geometrically equivalent tandem blade row has the total sound power level by 6.9...7.4 dB lower than the single fan. The use of the tandem axial fan allows improving acoustic characteristics
Highlights
The main trends in the development of aero-engine manufacturing provide for the solution of the main problem – increasing the fuel efficiency of gas turbine engines (GTE)
The aim of the paper is to evaluate the efficiency of using the tandem blade row for reducing the axial fan noise
The low-frequency maximum of the one-third octave-band spectrum corresponds to broadband emission with a continuous frequency spectrum [1]. This is evidenced by the joint consideration of the one-third octave-band and narrow-band radiation spectra of the axial fan
Summary
The main trends in the development of aero-engine manufacturing provide for the solution of the main problem – increasing the fuel efficiency of gas turbine engines (GTE). The main solutions to these problems are based on: – aerodynamic improvement of elements in the engine air-gas channel; – use of new methods of influence on processes in GTE elements; – use of control systems that provide optimum coordination of the geometric parameters of the engine elements with kinematic and thermodynamic parameters of the flow inside the engine. The use of tandem blade rows with optimum geometric parameters allows reducing the loss level and non-uniformity of the flow caused by aerodynamic trails. A comprehensive research of the flow in the tandem fan is an urgent task in solving the problem of increasing the acoustic perfection of gas-turbine engines
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