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單煤堆封閉煤棚內瞬態自然對流的數值研究

王文玥 崔會敏 韓智銘 劉慶寬

王文玥, 崔會敏, 韓智銘, 劉慶寬. 單煤堆封閉煤棚內瞬態自然對流的數值研究[J]. 工程力學, 2023, 40(10): 237-246. doi: 10.6052/j.issn.1000-4750.2022.01.0077
引用本文: 王文玥, 崔會敏, 韓智銘, 劉慶寬. 單煤堆封閉煤棚內瞬態自然對流的數值研究[J]. 工程力學, 2023, 40(10): 237-246. doi: 10.6052/j.issn.1000-4750.2022.01.0077
WANG Wen-yue, CUI Hui-min, HAN Zhi-ming, LIU Qing-kuan. NUMERICAL STUDY ON TRANISENT NATURAL CONVECTION IN COAL SHED ENCLOSED OF SINGLE COAL PILE[J]. Engineering Mechanics, 2023, 40(10): 237-246. doi: 10.6052/j.issn.1000-4750.2022.01.0077
Citation: WANG Wen-yue, CUI Hui-min, HAN Zhi-ming, LIU Qing-kuan. NUMERICAL STUDY ON TRANISENT NATURAL CONVECTION IN COAL SHED ENCLOSED OF SINGLE COAL PILE[J]. Engineering Mechanics, 2023, 40(10): 237-246. doi: 10.6052/j.issn.1000-4750.2022.01.0077

單煤堆封閉煤棚內瞬態自然對流的數值研究

doi: 10.6052/j.issn.1000-4750.2022.01.0077
基金項目: 國家自然科學基金項目( 5177838,11802186);河北省自然科學基金項目(E2018210113,E2018210044);河北省青年拔尖人才項目(BJ2019004)
詳細信息
    作者簡介:

    王文玥 (1996?),女,河北人,碩士生,主要從事大跨結構、高層建筑內對流傳熱研究(E-mail: wwy13103255557@163.com)

    韓智銘 (1987?),男,河北人,講師,博士,碩導,主要從事高速鐵路氣動荷載、節理巖體各向研究(E-mail: hanzhiming@stdu.edu.cn)

    劉慶寬 (1971?),男,河北人,教授,博士,博導,主要從事橋梁與結構的風荷載、風致振動與控制研究(E-mail: lgk@stdu.edu.cn)

    通訊作者:

    崔會敏 (1987?),女,河北人,講師,博士,碩導,主要從事大跨結構、高層建筑內對流傳熱研究(E-mail: huimincui@stdu.edu.cn)

  • 中圖分類號: O368

NUMERICAL STUDY ON TRANISENT NATURAL CONVECTION IN COAL SHED ENCLOSED OF SINGLE COAL PILE

  • 摘要: 近年來環境友好型的封閉式煤棚被廣為采用,而煤堆放熱會造成環境局部過熱進而影響舒適度及作業人員身體健康,隨之煤棚內對流換熱問題成為關注重點。為了降低煤堆放熱帶來的危害,需要了解煤堆放熱過程中傳熱流動機理,該文采用CFD數值模擬方法,對存儲單煤堆的封閉式大跨度煤棚內的自然對流現象進行研究。在非定常條件下,研究了固定瑞利數下煤堆附近傳熱特點和流動轉捩情況;研究了不同瑞利數下煤棚內流動結構的對稱性和非對稱結構出現時間,以及在充分發展階段流動表現出的非定常特性。結果表明,煤棚內瞬態流動會經歷三種不同發展階段:初始階段、演化階段和充分發展階段。在演化階段,羽流分離脫落會推動煤棚內非對稱流動結構形成,非對稱現象出現的時間會隨瑞利數增大而提前。在充分發展階段,煤棚內流動呈現無規則的非定常湍流狀態,且達到充分發展狀態的時間隨瑞利數增大而推遲。
  • 圖  1  二維煤棚模型示意圖 /m

    Figure  1.  Schematic diagram of two-dimensional coal shed model

    圖  2  網格劃分示意圖

    Figure  2.  Diagram of grid division

    圖  3  煤棚內兩對稱監測點上溫度時間序列

    Figure  3.  Time series of temperature at two symmetric points in coal shed

    圖  4  初始階段煤棚內等溫線圖和流線圖

    Figure  4.  Evolution of temperature field and velocity field in coal shed at initial stage

    圖  5  羽流發展初期煤棚內等溫線圖和流線圖

    Figure  5.  The isothermal and streamline in coal shed in the early stage of plume development

    圖  6  羽流發展中期煤棚內溫度場和速度場演化情況

    Figure  6.  Evolution of temperature field and velocity field in coal shed during plume development

    圖  7  不同等溫線增長速度時間序列

    Figure  7.  Time series of growth rates of some isothermals

    圖  8  總渦量大小的時間發展序列

    Figure  8.  Time evolution series of vorticity size

    圖  9  羽流發展后期煤棚內等溫線圖和流線圖

    Figure  9.  The isothermal and streamline in coal shed during late plume development

    圖  10  充分發展階段煤棚內等溫線圖和流線圖

    Figure  10.  The isothermal and streamline in coal shed during full development stage

    圖  11  Ra=5.22×1011煤堆附近對稱監測點P2、P2*溫度時間序列

    Figure  11.  Ra=5.22×1011 temperature time series of symmetrical monitoring at point P2、P2*near coal pile

    圖  12  不同時刻監測線(y=0.5)上垂向速度分布

    Figure  12.  The vertical velocity distribution on the monitoring line (y=0.5) at different times

    圖  13  不同瑞利數下兩對稱監測點P1和P1*的溫差時間序列

    Figure  13.  Temperature difference time series of two symmetric monitoring points P1 and P1* under different Rayleigh number

    圖  14  不同瑞利數下對稱監測點P1、P1*溫度時間序列和頻譜分析

    Figure  14.  Time series and spectral analysis of temperature of P1 and P1* at symmetric monitoring points under different Rayleigh numbers

    表  1  網格無關性驗證

    Table  1.   Grid independence verification

    編號 網格尺寸 網格數量 P3點時均溫度
    相對誤差/(%)
    P4點時均溫度
    相對誤差/(%)
    1 180×490 87 366 3.860 8.80
    2 220×495 108 000 ? ?
    3 250×670 160 000 0.058 0.68
    下載: 導出CSV

    表  2  時間步長無關性驗證

    Table  2.   Step size independence verification

    編號 時間步長 P1點時均溫度
    相對誤差/(%)
    P4點時均溫度
    相對誤差/(%)
    1 0.2 ? ?
    2 0.4 1.2 2.06
    3 0.6 28.9 16.50
    4 1.0 2.5 5.10
    下載: 導出CSV

    黑人大屌丝逼逼
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  • 收稿日期:  2022-01-17
  • 修回日期:  2022-06-07
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  • 刊出日期:  2023-10-10

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