A quantitative analysis of aerodynamic noise by sound sources from a nozzle inflow

Kwongi Lee; Cheolung Cheong; Kyeonghun Park

doi:10.7776/ASK.2022.41.6.698

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2022 Vol.41, Issue 6 Preview Page Next Page

Research Article

A quantitative analysis of aerodynamic noise by sound sources from a nozzle inflow 노즐 내부 유동 소음원에 의한 공력 소음의 정량적 분석

30 November 2022. pp. 698-704

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Abstract

In this paper, the radiated aerodynamic noise generated from sound sources of a nozzle inflow is quantitatively investigated and compared with experimental results of externally radiated noise. A high-resolution unsteady compressible Large Eddy Simulation (LES) technique is used to accurately predict the internal and external flow of three types of nozzle shape. Through using the vortex sound source for sound sources, the geometry of nozzle neck is identified as most significant aerodynamic noise sources. For validation of quantitative analysis, the vortex sound source intensity of internal nozzle flow is compared with results of external radiated noise of calculation and experiment.

Keywords

Sound source of nozzle internal flow

External radiated noise

Vortex sound source

Large Eddy Simulation (LES)

본 논문에서는 노즐 내부 유동의 소음원으로부터 발생되어 방사되는 공력 소음을 정량적으로 분석하였으며, 이를 외부 방사소음 결과와 비교하였다. 세가지 종류의 노즐 형상에 대해 내부 및 외부 유동을 정확히 예측하기 위해 고해상도 수치해석 기법인 비정상 압축성 대와류모사(Large Eddy Simulation, LES) 기법을 사용하였다. 와류소음원(Vortex Sound Source)을 통해 유동소음원을 확인하였으며, 이를 통해 노즐 내부 형상에서 주요 유동소음원의 분포를 확인하였다. 노즐 내부 유동의 와류소음원 레벨과 외부 방사 소음의 예측결과 및 측정결과와 비교하였으며, 이를 통해 정량적 분석을 검증하였다.

키워드

노즐 내부 유동

외부 방사 소음

와류소음원

대와류모사 (Large Eddy Simulation, LES)

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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 :698-704
Received Date : 2022-10-25
Revised Date : 2022-11-15
Accepted Date : 2022-11-21
DOI :https://doi.org/10.7776/ASK.2022.41.6.698

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

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