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PIV experimental study of the large-scale dynamic airflow structures in an aircraft cabin: Swing and oscillation

机译：机舱内大型动态气流结构的PIV实验研究：摆动和振荡

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摘要

The dynamic behaviors of airflows, which are common in aircraft cabins with mixing ventilations, significantly influence the thermal sensation of passengers and contaminant transmissions. In this paper, to analyze the large-scale dynamic characteristics in aircraft cabins, a series of long-term large-scale particle image velocimetry (PIV) measurements were performed in an aircraft cabin mockup to provide necessary basic data. Two typical airflow fields, jet zones characterized as large-scale circulations and collision zones featured as interactions of two lateral jets, were selected as the research objects of the dynamic behaviors in the cabin. In collision zones, the temporal characteristics of the swing motions were presented via proper orthogonal decomposition (POD) method, and the swing periods were 25.2 s-29.8 s and 13.0 s-19.8 s under isothermal and cooling conditions, respectively. By analyzing the occurrence probability of swings, the swing-induced contaminant transmission regularity was presented. In jet zones, the dynamic behavior of large-scale circulation was revealed by identifying the circulation center of each instantaneous flow field. However; the center oscillated in a small range near the breath zone of the passenger seating in the middle of one side, and the plumes under cooling conditions further reduced the range, which explained the lock-up phenomenon founded in contaminant transmission studies in the cabin. Finally, several vortex identification methods with raw and reconstructed instantaneous airflow fields were compared, and their practicalities were discussed. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在具有混合通风的飞机机舱中常见的气流动态行为会显着影响乘客的热感觉和污染物传播。在本文中，为了分析飞机机舱的大规模动态特性，在飞机机舱模型中进行了一系列长期的大规模粒子图像测速（PIV）测量，以提供必要的基本数据。选择了两个典型的气流场，以大尺度环流为特征的射流区和以两个侧向射流相互作用为特征的碰撞区，作为机舱内动态行为的研究对象。在碰撞区，通过适当的正交分解（POD）方法给出了摆动运动的时间特性，在等温和冷却条件下，摆动周期分别为25.2 s-29.8 s和13.0 s-19.8 s。通过分析摆动的发生概率，提出了摆动引起的污染物传播规律。在射流区，通过识别每个瞬时流场的循环中心，揭示了大规模循环的动力学行为。然而;中心在一侧中间的乘客座位呼吸区附近小范围内振荡，冷却条件下的羽流进一步缩小了范围，这解释了在机舱污染物传播研究中出现的锁定现象。最后，比较了几种利用原始和重建的瞬时气流场进行涡旋识别的方法，并讨论了其实用性。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Building and Environment》 |2017年第11期|180-191|共12页
  • 作者

    Li Jiayu; Liu Junjie; Wang Congcong; Wesseling Mark; Mueller Dirk;

  • 作者单位

    Tianjin Univ, Sch Environm Sci & Engn, Tianjin Key Lab Indoor Air Environm Qual Control, Tianjin 300072, Peoples R China|Rhein Westfal TH Aachen, EON Energy Res Ctr, Inst Energy Efficient Bldg & Indoor Climate, Mathieustr 10, Aachen, Germany;

    Tianjin Univ, Sch Environm Sci & Engn, Tianjin Key Lab Indoor Air Environm Qual Control, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Environm Sci & Engn, Tianjin Key Lab Indoor Air Environm Qual Control, Tianjin 300072, Peoples R China;

    Rhein Westfal TH Aachen, EON Energy Res Ctr, Inst Energy Efficient Bldg & Indoor Climate, Mathieustr 10, Aachen, Germany;

    Rhein Westfal TH Aachen, EON Energy Res Ctr, Inst Energy Efficient Bldg & Indoor Climate, Mathieustr 10, Aachen, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Unsteady airflow; POD; Vortex identification; Contaminant transmission; Cabin environment;

    机译：不稳定气流;POD;涡流识别;污染物传播;客舱环境;

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