风扇三维设计阶段宽频噪声快速评估方法及运用

doi:10.7527/S1000-6893.2023.28606

Abstract

Abstract:

In this study， a fast broadband noise prediction method was developed for the three-dimensional design stage of fans to predict the fan rotor-stator interaction broadband noise. The main purpose is to quickly obtain the broadband noise spectrum and characteristics after obtaining the aerodynamic characteristics in the fan three-dimensional design stage. The three-dimensional stage broadband noise model of the fan in this paper is a semi-analytical model based on the steady Reynolds Average Navier-Stokes equation （RANS）， which extracts the upstream blade wake turbulence information of the sound source through the steady Computational Fluid Dynamics （CFD） calculation results， and then couples the turbulence information with the analytical model to quickly predict the fan broadband noise level. In this paper， the established fast broadband noise prediction model is firstly introduced， followed by verification of the analytical method part of the broadband noise model by the experimental data of an annular cascade acoustic experimental platform， and finally， the prediction and evaluation of aerodynamic performance and acoustic performance of a single-stage axial fan and a two-stage axial fan are conducted using the established fast broadband noise prediction model. The results show that the distribution of upstream turbulence of the sound source is directly related to the secondary flow of the upstream blades. In addition， the level of broadband noise increases significantly when the actual operating state of the fan deviates from the design operating state.

Key words: fan, aeroacoustics, duct acoustics, rotor-stator interaction broadband noise, semi-analytical method, aerodynamic and acoustic integration design

CLC Number:

V211.3

Hang TONG, Liangji ZHANG, Ruibiao GAO, Weijie CHEN, Weiyang QIAO. Broadband noise fast evaluation method and its application in three dimensional design stage of fan[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(24): 128606-128606.

Figures/Tables 24

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Parameter	Value
Rotor blade number	19
Stator blade number	18
Shroud diameter/m	0.5
Hub diameter/m	0.285
Massflow/（kg·s^-1）	6.38
Design speed/（r·min^-1）	3 000
Total pressure ratio	1.02
Airfoil shape	NACA-65
Rotor tip clear/mm	0.6

Parameter	Value
Chord length of R₁/m	0.122
Chord length of S₁/m	0.106
Chord length of R₂/m	0.130
Chord length of S₂/m	0.117
Shroud diameter/m	0.9
Hub diameter/m	0.540
Massflow/（kg·s^-1）	25
Design speed/（r·min^-1）	1 500
Total pressure ratio	1.035
Airfoil shape	NACA-65-010

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Broadband noise fast evaluation method and its application in three dimensional design stage of fan

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