{"title":"带建筑横梁隧道中喷气扇的流场特性和压力预测研究","authors":"Zihan Yu , Jiaming Zhao , Zhisheng Xu , Shiyi Chen , Baochao Xie","doi":"10.1016/j.jweia.2024.105873","DOIUrl":null,"url":null,"abstract":"<div><p>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 <em>L*</em> 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.</p></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"254 ","pages":"Article 105873"},"PeriodicalIF":4.2000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study of the flow field characteristics and pressure prediction of jet fans in the tunnel with building beams\",\"authors\":\"Zihan Yu , Jiaming Zhao , Zhisheng Xu , Shiyi Chen , Baochao Xie\",\"doi\":\"10.1016/j.jweia.2024.105873\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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 <em>L*</em> 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.</p></div>\",\"PeriodicalId\":54752,\"journal\":{\"name\":\"Journal of Wind Engineering and Industrial Aerodynamics\",\"volume\":\"254 \",\"pages\":\"Article 105873\"},\"PeriodicalIF\":4.2000,\"publicationDate\":\"2024-09-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Wind Engineering and Industrial Aerodynamics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0167610524002368\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CIVIL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Wind Engineering and Industrial Aerodynamics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167610524002368","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
Study of the flow field characteristics and pressure prediction of jet fans in the tunnel with building beams
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.
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.
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