摘要
根据相似理论,分析了盐水模型实验在自然通风研究中的可行性,讨论了空气中的热羽流和盐水溶液羽流的相似条件。建立了自然通风盐水模型实验台,以盐水和清水之间的密度差模拟空气的温度差,用盐水在清水中的运动模拟实际建筑中热羽流的运动。实验过程中在盐水中加入染料,可以清晰地观察到羽流的发生和发展过程,运动规律以及相互作用。研究了风口,热源及羽流等因素对通风效果的影响,准确地预测热分层高度、温度分布和通风量的变化规律。
A laboratory method for studying natural ventilation was analyzed and the feasibility was proved. Experimental study was performed in a scaled-down salt-bath model. The ratio between model and prototype was discussed based on similarity theory. Temperature difference in the prototype building was modeled by density difference of brine and fresh water in the scaled model. The height of the interface could be seen clearly and the density profile which simulates the temperature profile in the prototype building could be measured using conduct meter in the model. The movement and interacting of the plume could be observed by adding pigment into the brine. The effect of vent, heat source and plumes could also be studied using the salt-bath model.
出处
《建筑热能通风空调》
2007年第5期20-24,54,共6页
Building Energy & Environment
关键词
自然通风
相似理论
盐水实验
羽流
热分层高度
natural ventilation, similarity theory, salt-bath experiment, plume, height of the interface
