Characterization of surface pressure field inducing Flow induced vibration/Acoustic induced vibration due to orifice flow inside pipes

Inseop Choi; Sangheon Lee; Cheolung Cheong; Myengkab Seo; Sangkyung Sung

doi:10.7776/ASK.2024.43.5.557

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2024 Vol.43, Issue 5 Preview Page Next Page

Research Article

Characterization of surface pressure field inducing Flow induced vibration/Acoustic induced vibration due to orifice flow inside pipes 배관 내부 오리피스 유동에 의한 유동 유기 진동/음향 유기 진동 유발 표면압력장 특성에 대한 고찰

30 September 2024. pp. 557-569

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Abstract

Recently, the operating speed of pressure devices is increased for high performance. It lead to the increase of flow rate. Consequently, the results in the high relative contribution of flow borne noise to the noise from pipe. Analyzing the characteristics of flow-borne noise is essential for evaluating noise performance during the design stage of the piping system. Therefore, in this paper, the noise generation mechanism and transfer characteristic was numerically investigated. The wall pressure induced by the fluid moving through the orifice was predicted using the compressible Large Eddy Simulation (LES). The Wavenumber–Frequency Analysis (WFA) was employed to decompose the wall pressure into incompressible and compressible component, which are to cause Fluid Induced Vibration (FIV) and Acoustic Induced Vibration (AIV). The propagation and contribution characteristics were analyzed using the separated incompressible and compressible wall pressure components. Additionally, the correlation between these pressure components and the internal flow within the piping was investigated through flow field analysis, which elucidated the mechanisms and propagation characteristics of flow-induced noise. From these results, it was confirmed that the contribution of the incompressible wall pressure component was high near the noise source and that the contribution of the compressible wall pressure component increased as it propagated long distances upstream and downstream direction of the noise source.

Keywords

Pipe system

Wall pressure fluctuation

Fluid Induced Vibration (FIV)

Acoustic Induced Vibration (AIV)

최근 유체와 에너지의 전달 성능을 향상시키기 위해 가압 장치의 작동 속도가 증가하고 있으며, 이는 유체의 이송 속도를 증가시켜 유체에 의한 소음의 상대적 기여를 높이고 있다. 배관계의 설계 단계에서 소음 성능을 평가하기 위해서는 유동소음의 특성에 대한 분석이 필수적이다. 따라서, 본 논문에서는 배관에서 발생하는 소음의 발생 메커니즘 및 전파 특성에 대하여 수치적으로 분석하였다. 압축성 대 와류 모사 기법을 이용하여 오리피스 배관 요소를 지나는 유체에 의해 발생하는 벽면 압력 가진력을 예측하였다. 이후, 파수-주파수 분석법을 이용하여 유동 기인 진동과 음향 기인 진동의 가진력으로 알려진 비압축성 및 압축성 압력 성분으로 분리하였다. 분리된 비압축성 및 압축성 벽면 압력 성분을 이용하여 각 압력 성분의 전파 및 기여도 특징을 분석하였으며, 유동장 분석을 통해 비압축성 및 압축성 압력 성분과 배관 내부 유동의 상관성을 분석하여 유동소음의 발생 메커니즘과 전파 특성을 규명하였다. 이를 통해 비압축성 벽면 압력 성분의 경우 소음원 인근 영역에서 기여도가 큼을 확인하였으며, 압축성 벽면 압력 성분의 경우 소음원 상류 및 하류 방향으로 장거리 전파됨에 따라 기여도가 증가함을 정량적 및 시각적으로 확인하였다.

키워드

배관계

벽면 압력 가진력

유동 유기 진동

음향 유기 진동

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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 : 43
No :5
Pages :557-569
Received Date : 2024-09-02
Accepted Date : 2024-09-23
DOI :https://doi.org/10.7776/ASK.2024.43.5.557

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

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