长距离地下综合管廊局部通风强化换热效果研究
摘要：现有的地下综合管廊通风散热方法主要为换气次数法。当管廊长度增加时，要满足规范规定的廊内温度不高于40℃的要求需要非常大的换气量，并会导致管廊前端区域过冷，整体散热效果并不好。本文提出了一种可用于长距离地下综合管廊的局部通风方式，使用CFD方法建立了局部通风数值模型，通过缩尺模型实验验证了其准确性。对增设射流风机后形成的局部通风气流组织进行了研究，结果表明，在总送风量相同的情况下，设置射流风机能够改善管廊局部热环境，在本文所研究工况下，局部截面平均温度降低了0.5℃。对比研究发现：管廊进口风量和射流风机风量之比对管廊内热环境影响不大；风机射流角度对管廊内热环境的优化具有显著影响，射流角度为90°时管廊后端截面平均温度相比0°、45°分别降低了0.41、0.33℃,90°为最优射流角度。
关键词：管廊气流组织局部控制通风散热数值模拟
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[12] 陈芬.城市特长隧道通风关键技术研究：以东湖通道工程为例[D].武汉：武汉工程大学，2018:19- 21.
[13] CHEN T,LI Y,XU Z,et al.Study of the optimal pitch angle of jet fans in road tunnels based on turbulent jet theory and numerical simulation[J].Building and environment,2019,165:106390.
[14] 林俊，丛北华，韩新，等.基于CFD模拟分析的城市综合管廊火灾特性研究[J].灾害学，2010,25(增刊1):374.
[15] 叶爽，张红永，王文新，等.模拟不同通风方式下综合管廊热力舱热力管道最佳通风区[J].科学技术与工程，2020,20(16):6606- 6612.
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Heat transfer enhancement effect of local ventilation in long-distance utility tunnels
Abstract: The ventilation and heat dissipation method of the existing utility tunnels is mainly the air exchange rate method. When the length of the utility tunnel increases, a very large amount of ventilation is required to meet the requirement that the temperature is not higher than 40 ℃ in the specification, the front end of the utility tunnel will be too cold, and the overall heat dissipation effect is not good. In this paper, a local ventilation method that can be used for long-distance utility tunnels is proposed, a numerical model of the local ventilation is established by CFD method, and its accuracy is verified by the scaled model experiment. The air distribution of local ventilation formed after the addition of jet fans is studied. The results show that the local thermal environment of the utility tunnel can be improved by setting the jet fan under the condition that the total air supply volume is the same, and the average temperature of the local section can be reduced by 0.5 ℃ under the working conditions studied in this paper. The comparative results show that the ratio between the inlet air volume of the utility tunnel and the air volume of the jet fan has little impact on the thermal environment in the utility tunnel. The jet angle of the jet fan has a significant impact on the optimization of the thermal environment in the utility tunnel, when the jet angle is 90°, the average temperature of the rear end section of the tunnel is reduced 0.41 ℃ and 0.33 ℃ compared with 0° and 45°, respectively, and 90° is the optimal jet angle.
Keywords: utility tunnel; air distribution; local control; ventilation and heat dissipation; numerical simulation;
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