Prediction of Flow Noise for Air Handling Piping System

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  • DOSHIDA Suguru
    Research & Development Center, Technical Supervision Division, Shinryo Corporation
  • MIKAMI Hideto
    Research & Development Center, Technical Supervision Division, Shinryo Corporation
  • MIKUNI Tsunebumi
    Research & Development Center, Technical Supervision Division, Shinryo Corporation
  • MINORIKAWA Gaku
    Department of Mechanical Engineering, Faculty of Science and Engineering, HOSEI University

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Other Title
  • 空調設備における流体音予測に関する研究
  • 空調設備における流体音予測に関する研究(第1報)分岐管・合流管の流体音実験と数値解析
  • クウチョウ セツビ ニ オケル リュウタイオン ヨソク ニ カンスル ケンキュウ(ダイ1ポウ)ブンキカン ・ ゴウリュウカン ノ リュウタイオン ジッケン ト スウチ カイセキ
  • 第1報−分岐管・合流管の流体音実験と数値解析
  • Part 1-Experimental and Numerical Analysis of Flow Noise in Branch and Merging Pipes

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Abstract

<p>For air conditioning systems in buildings or facilities, reduction of flow noise is an important requirement. Flow noise is generated not only by turbomachinery, such as fans or pumps, but also by piping or valves, and causes a serious problem. In this report, a unique experimental setup, which produces a flow without a fan, was installed in an anechoic room to measure flow noise from a piping element, such as a branch and merging pipe, and the effectiveness of the flow noise prediction was examined using computational fluid dynamics. First, calculation methodologies, such as RANS and LES, for the flow field were examined. Moreover, calculation conditions were established for flow noise prediction. Second, acoustic analysis was conducted by using a sound source obtained from unsteady flow analysis and compared with that obtained through the experiment. The result shows that acoustic resonance in piping is considered and the methodology is applicable to quantitative prediction of flow noise.</p>

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