Study of the flow field characteristics and pressure prediction of jet fans in the tunnel with building beams

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL Journal of Wind Engineering and Industrial Aerodynamics Pub Date : 2024-09-11 DOI:10.1016/j.jweia.2024.105873

Zihan Yu , Jiaming Zhao , Zhisheng Xu , Shiyi Chen , Baochao Xie

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Abstract

The tunnel with building beams is a new type of tunnel that combines an above-ground building with an underground tunnel to save space in the city. These tunnels have dense beams on the tunnel ceiling for load-bearing. When jet fans work, a large resistance is generated in the tunnels with building beams. In this study, numerical simulation models of tunnels with different beam sizes were built and used to obtain the velocity and pressure distributions. The results show that the pressure of jet fans is lower. The tunnel velocity affects the air entrained in the fan inlet section. Depending on the ratio of beam height to beam spacing, three different flow regimes are produced. The dimensionless beam size L* is introduced to describe the flow regime in the tunnel. When L* <20, skimming flow and wake interference flow are dominant， which has little influence on jet fans. When L* >20, isolated roughness flow is dominant. The velocity and pressure in the tunnel are maintained at a low level, which has a negative impact on jet fans. Results can help engineers estimate the impact of beam size on jet fans and improve tunnel ventilation systems.

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带建筑横梁隧道中喷气扇的流场特性和压力预测研究

带建筑梁的隧道是一种新型隧道，它将地面建筑与地下隧道相结合，以节省城市空间。这种隧道的天花板上有密集的梁，用于承重。当喷射风机工作时，带建筑梁的隧道内会产生很大的阻力。本研究建立了不同梁尺寸的隧道数值模拟模型，并利用该模型获得了速度和压力分布。结果表明，射流风机的压力较低。隧道速度会影响风扇入口部分的夹带空气。根据横梁高度与横梁间距的比例，会产生三种不同的流动状态。引入无量纲梁尺寸 L* 来描述隧道内的流动状态。当 L* <20 时，撇流和尾流干扰流占主导地位，对射流风机影响很小。当 L* >20时，孤立粗糙流占主导地位。隧道内的速度和压力保持在较低水平，对射流风机有负面影响。研究结果可帮助工程师估算梁尺寸对射流风机的影响，并改进隧道通风系统。

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来源期刊

Journal of Wind Engineering and Industrial Aerodynamics 工程技术-工程：土木

CiteScore

8.90

自引率

22.90%

发文量

306

审稿时长

4.4 months

期刊介绍： The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.