Numerical comparative study on high-fidelity prediction of aerodynamic noise from centrifugal fan system

Seo-Yoon Ryu; Minseung Jung; Younguk Song; Cheolung Cheong

doi:10.7776/ASK.2022.41.6.713

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2022 Vol.41, Issue 6 Preview Page Next Page

Research Article

Numerical comparative study on high-fidelity prediction of aerodynamic noise from centrifugal fan system 원심팬 시스템의 공력소음 고신뢰 예측을 위한 수치 비교 연구

30 November 2022. pp. 713-722

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Abstract

In this paper, the flow performance and aero-acoustic noise generated by the target centrifugal fan system were investigated numerically and experimentally. Also, the numerical method for Computational Aero-Acoustics were evaluated by comparing each method. To analyze the performance of the centrifugal fan experimentally, the acoustic power level was measured in the semi-anechoic chamber using microphones, and the active frequency range for the noise performance was identified and that frequency range was applied for Computational Aero-Acoustics (CAA) techniques as sampling frequency. Then, Navier-Stokes equation and the Ffowcs Williams&Hawking equations were used to analyze the flow and sound power numerically, respectively, and a virtual acoustic radiation plane was designed and used for the implementation of the sound field. The accuracy and numerical characteristics of the numerical methods were validated by comparing simulated acoustic power levels with acoustic power levels measured.

Keywords

Centrifugal fan system

Computational Fluid Dynamics (CFD)

Computational Aero-Acoustics (CAA)

Large Eddy Simulation (LES)

Acoustic power

본 연구에서는 대상 원심팬 시스템에서 발생하는 유동 현상과 공력 음향 성능을 수치적/실험적으로 분석하고 다양한 수치 기법을 비교하여 평가하고자 하였다. 먼저 원심팬의 성능을 실험적으로 분석하기 위해 반무향실에서 음향 파워를 측정하였으며, 실험 결과를 통해 대상 원심팬 시스템에서 방사되는 소음 성능에 대한 유효 주파수 범위를 파악하고 이에 대한 수치 모사를 실시하였다. 수치적으로 유동 및 음향 파워를 분석하기 위해 Navier-Stokes 방정식과 Ffowcs Williams&Hawkings 방정식을 각각 유동장과 음향장의 지배방정식으로 사용하였으며, 음향장의 구현을 위해 가상의 음향 방사면을 설계하여 사용하였다. 고차 3차원 전산유체역학(Computational Fluid Dynamics, CFD)와 연계된 Hybrid-CAA 기법을 사용하여 모사한 음향 파워 레벨과 소음 실험을 통해 측정한 음향 파워 레벨의 비교를 통해 사용된 수치 기법의 정확도 및 수치적 특성을 평가하였다.

키워드

원심팬 시스템

전산유체역학

전산음향학

대와류모사법

음향 파워

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 41
No :6
Pages :713-722
Received Date : 2022-10-25
Revised Date : 2022-11-14
Accepted Date : 2022-11-16
DOI :https://doi.org/10.7776/ASK.2022.41.6.713

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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