Numerical and experimental analysis of aerodynamics and aeroacoustics of high-speed train using compressible Large Eddy Simulation

Kwongi Lee; Cheolung Cheong; Jaehwan Kim; Minseung Jung

doi:10.7776/ASK.2024.43.1.095

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2024 Vol.43, Issue 1 Preview Page Next Page

Research Article

Numerical and experimental analysis of aerodynamics and aeroacoustics of high-speed train using compressible Large Eddy Simulation 압축성 대와류모사를 이용한 고속열차의 공력 및 공력소음의 수치적/실험적 분석

31 January 2024. pp. 95-102

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Abstract

Due to technological advances, the cruising speed of high-speed trains is increasing, and aerodynamic noise generated from the flow outside the train has been an important consideration in the design stage. To accurately predict the flow-induced noise, high-resolution generation of sound sources in the near field and low-dissipation of sound propagation in the far field are required. This should be accompanied by a numerical grid and time resolution that can properly consider both temporal and spatial scales for each component of the real high-speed train. To overcome these challenges, this research simultaneously calculates the external flow and acoustic fields of five high-speed train cars of real-scale and at operational running speeds using a three-dimensional unsteady Large Eddy Simulation technique. To verify the numerical analysis, the measurements of the wall pressure fluctuation and numerical results are compared. The Ffowcs Williams and Hawking equation is used to predict the acoustic power radiated from the high-speed train. This research is expected to contribute to noise reduction based on the analysis of the aerodynamic noise generation mechanism of high-speed trains.

Keywords

High-speed train

Flow-induced noise

Aeroacoustics

External radiated noise

Large eddy simulation

기술 발전에 힘입어 고속열차의 운항속도는 증가하고 있으며, 고속열차 외부 유동장으로부터 발생하는 공력소음은 설계 단계에서 매우 중요한 고려 대상이 되어왔다. 이러한 고속열차의 유동기인소음을 정확하게 예측하기 위해서는 근거리 음향장에서 고해상도의 음원 발생과 원거리 음향장에서 수치적 소산이 적은 소음 전파가 요구된다. 이는 실제 고속열차의 구성요소 별로 시공간 스케일을 모두 적절하게 고려할 수 있는 수치격자 및 시간해상도가 동반되어야 한다. 이러한 도전점을 극복하기 위해, 본 연구는 실제 크기 및 실제 운행속도의 고속열차 5차량의 외부 유동장 및 음향장을 3차원 압축성 대와류모사(Large Eddy Simulation, LES) 기법을 이용하여 동시 계산하였다. 수치해석의 검증을 위해 벽면압력섭동 측정 결과와 수치해석 결과를 비교하였다. Ffowcs Williams and Hawkings 방정식을 이용하여 고속열차로부터 방사되는 음향파워를 예측하고 주행속도간 결과를 비교분석하였다. 본 연구는 고속열차의 공력소음 발생 메커니즘 분석을 바탕으로 한 소음 저감에 기여할 것으로 사료된다.

키워드

고속열차

유동기인소음

공력소음

외부방사소음

대와류모사

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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 :1
Pages :95-102
Received Date : 2023-12-14
Revised Date : 2024-01-04
Accepted Date : 2024-01-16
DOI :https://doi.org/10.7776/ASK.2024.43.1.095

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

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