Numerical simulation on exploringinfluencing factors of wind-driven naturalventilation effect in large indoor dock

The shipbuilding industry is booming and the health problems of workers caused by the harsh indoor dock environmentforce us to explore efficient and reasonable ventilation methods suitable for large workshops.Due to the strongspecificity of large workshops,general or local ventilation methods cannot be universally applied.It has great potentialand good economy to improve indoor environment by changing natural ventilation design.Computational fluiddynamics(CFD)has gradually become a powerful tool for predicting indoor and outdoor airflow organization andoptimizing indoor ventilation.This paper adopts CFD to study the effect of the inflow wind speed,the position of theside wall shutters,the area ratio and form of roof ventilators on the effectiveness of natural ventilation in a large shipyarddriven by wind pressure.The results show that the influence on total ventilation volume is more obvious whenthe intake side is shaded than the exhaust side.Different incoming wind speeds will affect the wind pressure at theventilation position,which is the decisive external factor affecting the natural ventilation of docks.When the area ratioof roof ventilators increases to a certain extent,its continued increase has an insignificant effect on the total ventilationvolume.The influence of changing the arrangement of the roof ventilator on the natural ventilation effect can beneglected when the area ratio is kept constant.

我国造船行业方兴未艾,船舶行业大型车间室内环境质量差引起的工人健康问题日益受到重视,迫切需要研究适合于大型厂房的高效通风方式。自然通风具有通风量大、且无需风机动力能耗的优势,在大型船舶车间应用广泛。本文采用计算流体动力学方法探究自然通风来流风速、侧墙百叶位置、屋顶通风器面积比例和布置形式对于风压驱动的大型船坞内自然通风效果的影响。结果表明,进风侧受遮挡时对总通风量的影响比排风侧更为明显。不同的来流风速会影响通风位置的风压,这是影响船坞自然通风的决定性外部因素。当屋顶通风器的面积比例增加到一定程度时,继续增大面积对于提高总通风量的效果微弱。当面积比例固定时,改变屋顶通风器的布置形式对于改变自然通风效果的影响可以忽略。