送风井位于隧道中部的半横向分区段通风特性研究
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摘要
为了确定一种送风井位于隧道中部,隧道内需风量存在分区段变化的半横向通风方式计算方法,以厦门海沧疏港通道-芦澳路城市地下互通隧道工程为依托,采用理论分析和数值模拟研究方法对风道内的压力分布进行研究,并对比送风井位置对风机压力的影响。研究通过在风道末端与风道内任意断面建立一元伯努利方程推导风道末端风速为0和风速不为0 2种情况下风道内的压力分布求解公式,数值计算结果验证了公式的正确性。根据研究结果,送风井位于隧道中部时,两侧风道始端全压可以视为相等,送风机提供满足通风压力较大一侧所需全压即可实现整个隧道的有效通风,该通风方式在增大通风长度适应性以及减小风机功率,以及提高经济性方面具有显著的优势。
In this paper, a special form of semi-transverse ventilation applied in Xiamen Shugang-Luao underground overpass was studied. Different from ordinary ones, inclined shaft was built at the middle of the tunnel and the requirement of fresh air per meter along this tunnel is not constant in this ventilation. According to the fresh air requirement standard per meter, air duct was divided into different sections. Based on an assumption that air was evenly supplied in each section, flow rate of the air duct was obtained. With energy conservation equations built between the cross sections internal and at the end of duct sections, two formulas for calculating static pressure along the air duct were derived and the theoretical calculations was verified with numerical results.In this kind of ventilation, air flow from the inclined shaft separates into two directions and research reveals that the two sections nearly have same total pressure at the separation point, which leads to a great reduction of fan power when compared with those in which shaft built at the end of a tunnel.
In this paper, a special form of semi-transverse ventilation applied in Xiamen Shugang-Luao underground overpass was studied. Different from ordinary ones, inclined shaft was built at the middle of the tunnel and the requirement of fresh air per meter along this tunnel is not constant in this ventilation. According to the fresh air requirement standard per meter, air duct was divided into different sections. Based on an assumption that air was evenly supplied in each section, flow rate of the air duct was obtained. With energy conservation equations built between the cross sections internal and at the end of duct sections, two formulas for calculating static pressure along the air duct were derived and the theoretical calculations was verified with numerical results.In this kind of ventilation, air flow from the inclined shaft separates into two directions and research reveals that the two sections nearly have same total pressure at the separation point, which leads to a great reduction of fan power when compared with those in which shaft built at the end of a tunnel.
引文
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[14]张恒,林放,孙建春,等.基于典型壁面粗糙模型的隧道施工通风效果CFD分析[J].中国铁道科学,2016,37(5):58-65.ZHANG Heng,LIN Fang,SUN Jianchun,et al.CFDanalysis of tunnel construction ventilation effect based on typical roughness model[J].China Railway Science,2016,37(5):58-65.
[2]Choi J S,Kim M B,Choi D H.Experimental investigation on smoke propagation in a transversely ventilated tunnel[J].Journal of Fire Sciences,2005,23(6):469-483.
[3]LI J S M,Chow W K.Numerical studies on performance evaluation of tunnel ventilation safety systems[J].Tunneling&Underground Space Technology Incorporating Trenchless Technology Research,2003,18(5):435-452.
[4]Lesser N,Horowitz F,King K.Transverse ventilation system of the Holland tunnel evaluated and operated in semi-transverse mode[J].Transportation Research Record,1987.
[5]《中国公路学报》编辑部.中国隧道工程学术研究综述·2015[J].中国公路学报,2015,28(5):1-65.Editorial Department of China Journal of Highway and Transport.Review on China's tunnel engineering research:2015[J].China Journal of Highway and Transport,2015,28(5):1-65.
[6]王亚琼,谢永利,刘洪洲,等.海底隧道半横向通风孔物理模型试验[J].中国公路学报,2010,23(3):76-82.WANG Yaqiong,XIE Yongli,LIU Hongzhou,et al.Physical model experiment on semi-transverse ventilation air inletand outlet of subsea tunnel[J].China Journal of Highway and Transport,2010,23(3):76-82.
[7]Jo H J,Min K M,Daiki Min,et al.A fundamental study for optimizing the supply and exhaust port opening ratio in road tunnels with transverse ventilation system[J].Journal of the Korean Society of Mineral and Energy Resources Engineering,2016,53(2):140-145.
[8]Hyeong-Je Jo,Kyu-Myung Chun,Dea-Kee Min,et al.Astudy on the program development for optimizing the supply and exhaust port opening ratio in road tunnels with transverse ventilation system[J].Journal of Korean Tunneling and Underground Space Association,2017,19(3):517-532.
[9]JTG/T D70/2-02-2014,公路隧道通风设计细则[S].JTG/T D70/2-02-2014,Guidelines for design of ventilation of highway tunnels[S].
[10]陈德芳.半横向通风方式分析研究和计算[J].地下工程与隧道,1996(2):24-35.CHEN Defang.Study on semi-transvers ventilation[J].Underground and Tunnel Engineering,1996(2):24-35.
[11]夏永旭,赵峰.特长公路隧道纵向-半横向混合式通风方式研究[J].中国公路学报,2005,18(3):80-83.XIA Yongxu,ZHAO Feng.Research on the combined longitudinal and semi-transverse ventilation system in lengthy highway tunnels[J].China Journal of Highway and Transport,2005,18(3):80-83.
[12]刘健.隧道通风安全与照明[M].重庆:重庆大学出版社,2015.LIU Jian.Tunnel ventilation safety and lighting[M].Chongqing:Chongqing University Press,2015.
[13]石喜,吕宏兴,朱德兰,等.PVC三通管水流阻力与流动特征分析[J].农业机械学报,2013,44(1):73-79.SHI Xi,LüHongxing,ZHU Delan,et al.Flow resistance and characteristics of PVC tee pipes[J].Transactions of the China Society for Agricultural Machinery,2013,44(1):73-79.
[14]张恒,林放,孙建春,等.基于典型壁面粗糙模型的隧道施工通风效果CFD分析[J].中国铁道科学,2016,37(5):58-65.ZHANG Heng,LIN Fang,SUN Jianchun,et al.CFDanalysis of tunnel construction ventilation effect based on typical roughness model[J].China Railway Science,2016,37(5):58-65.
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