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Study on ventilation performance of lateral exhaust hood under the influence of two high-temperature buoyant jets

机译：两种高温浮动喷气机影响下横向排气罩通风性能的研究

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摘要

Two high-temperature buoyant jets widely exist during the pouring process of molten metal. The lateral exhaust hood is usually used to capture contaminated airflow considering production process. However, the current flow ratio design method for the lateral exhaust hood is in consideration of a single pollution source. In this study, the applicability of the current flow ratio design method for controlling two high-temperature buoyant jets is analyzed. And the performance of lateral exhaust hood influenced by these two buoyant jets is investigated through model experiment and numerical simulation. Investigated factors are distances between two high-temperature buoyant jets, initial velocity ratios, and initial temperature ratios. The results show that the maximum capture efficiency is less than 60% when the optimal exhaust flow rate for controlling the single-buoyant jet is doubled to control the two buoyant jets. Besides, with the distance ratio between the two buoyant jets increasing to 0.75, the two jets merge into one jet. Then, compared with that when the velocity ratio is 0.4, the dimensionless installation height of the lateral exhaust hood should be increased by about 0.04 when the velocity ratio is 1.0 and by about 0.12 when the velocity ratio is 1.4. Finally, with the temperature ratio increasing, the lateral exhaust hood flowrate should be increased to improve the capture efficiency instead of exhaust hood installation heights. In summary, the obtained conclusions could help develop high-efficiency ventilation systems and reduce the energy consumption of the industrial buildings.
机译：在熔融金属的浇注过程中，两种高温浮力喷气机广泛存在。侧向排气罩通常用于考虑生产过程的污染气流。然而，侧向排气罩的电流流量比设计方法考虑了单一污染源。在该研究中，分析了对控制两个高温浮动喷射的电流流量比设计方法的适用性。通过模型实验和数值模拟来研究由这两个浮动喷射器影响的侧向排气罩的性能。调查的因素是两个高温浮气喷射，初始速度比和初始温度比之间的距离。结果表明，当控制单浮标射流的最佳排气流量加倍以控制两个浮动喷射时，最大捕获效率小于60％。此外，在两个浮动喷射器之间的距离比率增加到0.75之间，两个喷射器合并成一个喷射。然后，与当速度比为0.4时，当速度比为1.0且速度比为1.4时，横向排气罩的无量子安装高度应增加约0.04。最后，随着温度比增加，应增加横向排气罩流量以提高捕获效率而不是排气罩安装高度。总之，所获得的结论可以有助于开发高效通风系统，并降低工业建筑的能源消耗。

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  • 来源
    《Building and Environment》 |2020年第6期|106849.1-106849.15|共15页
  • 作者

    Huang Yanqiu; Lu Ke; Guo Junwei; Wang Yi; Zhao Chunxiao; Zhai Yingni;

  • 作者单位

    Xian Univ Architecture & Technol State Key Lab Green Bldg Western China Xian 710055 Peoples R China|Xian Univ Architecture & Technol Sch Bldg Serv Sci & Engn 13 Yanta RD Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol Sch Bldg Serv Sci & Engn 13 Yanta RD Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol Sch Bldg Serv Sci & Engn 13 Yanta RD Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol State Key Lab Green Bldg Western China Xian 710055 Peoples R China|Xian Univ Architecture & Technol Sch Bldg Serv Sci & Engn 13 Yanta RD Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol Sch Bldg Serv Sci & Engn 13 Yanta RD Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol State Key Lab Green Bldg Western China Xian 710055 Peoples R China|Xian Univ Architecture & Technol Sch Mech & Elect Engn 13 Yanta RD Xian 710055 Shaanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Flow field characteristics; Capture efficiency; Lateral exhaust hood; Two high-temperature buoyant jets; Model experiment and numerical simulation;

    机译：流场特征;捕获效率;侧向排气罩;两个高温浮力喷射;模型实验和数值模拟;

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