脉动风单侧自然通风中湍流特征的影响

发布时间：2018-06-11 11:57

本文选题：单侧自然通风 + 动态　；参考：《浙江大学》2013年硕士论文

【摘要】：随着大家对能源和环境意识的提高,自然通风技术越来越受到重视和研究应用。在建筑设计中,通过仔细考虑和巧妙的设计,人们可以最大限度的利用自然通风。在过渡季节,不仅可以满足室内一定量的通风换气次数,保证室内空气品质,而且还可以充分带走室内热负荷,减少空调或机械通风的使用,有很高的节能潜力。尽管单侧开口房间的自然通风效率比双侧通风低,但是这种通风方式在现实生活中非常普遍。本文对国内外对单开口风压通风相关的理论进行了研究,并进行了单开口风压自然通风的实验、同时采用模拟仿真软件对单开口风压通风在不同条件下的通风效果和新风有效进深进行了分析。通过对比模拟值和实验数据,讨论了目前单侧自然通风计算模型的准确性。通过本文的研究,主要得出以下结论：建筑的通风效果与通风面积、风速大小、风向和风速波动情况均有着密切关系,通风面积的影响相对较大；对于动态风,在本实验设定的条件下,当周期较短时通风效果低于静态风,当周期高于某一临界值时通风效果高于静态风。研究中数值模拟和实验情况较符合,建立的模型是比较合理的,从而证明了数值模拟的有效性。随着风速的增大实测值和模拟值的差别变大,可能是由于实测的房间的体积较小而单侧通风的湍流引起的气流交换比重加大,而湍流本身的不确定性大,在不同不同位置的浓度值差别很大,所以使得实测值和模拟值的差距变大。本文还存在一些不足之处：由于时间和实验条件的诸多限制,实验测试工况不够多；只对理论通风量公式进行了讨论,并没有提出可行的修正公式；由于时间和计算机能力的限制,单开口风压自然通风的研究仅仅停留在定性研究的阶段。
[Abstract]:With the increasing awareness of energy and environment, natural ventilation technology has been paid more and more attention and applied. In architectural design, people can maximize the use of natural ventilation by careful consideration and clever design. In the transition season, the number of ventilation and ventilation can be met not only in the interior of the room, but also in the indoor air quality. It also can fully take away the indoor heat load, reduce the use of air conditioning or mechanical ventilation, and has a high energy saving potential.
Although the natural ventilation efficiency of one side open room is lower than that of bilateral ventilation, this ventilation mode is very common in real life. In this paper, the theory of single opening wind pressure ventilation is studied at home and abroad, and a single open air pressure natural ventilation experiment is carried out. At the same time, the single open air pressure ventilation is used in the simulation software. The ventilation effect and the effective fresh air depth under different conditions are analyzed. By comparing the simulated value and the experimental data, the accuracy of the present single side natural ventilation calculation model is discussed. Through this study, the main conclusions are drawn as follows: the ventilation effect of the building and the ventilation area, the wind speed, the wind direction and the wind velocity fluctuate. In close relation, the effect of ventilation area is relatively large; for dynamic wind, under the condition of the experiment, the ventilation effect is lower than that of static wind when the period is shorter. When the cycle is higher than a certain critical value, the ventilation effect is higher than that of the static wind. The effectiveness of numerical simulation. As the difference between the measured and simulated values of the wind speed increases, it is possible to increase the specific gravity of the air flow caused by the small volume of the measured room and the turbulence of the single side ventilation, and the uncertainty of the turbulence itself is large, and the concentration values in different positions are very different, so the measured values and the simulated values are made. The gap is bigger.
There are also some shortcomings in this paper: because of the limitations of time and experimental conditions, the experimental test conditions are not enough; the formula of theoretical ventilation is discussed only, and the feasible correction formula is not put forward. Because of the time and computer ability, the study of the single open air pressure self ventilation is only in qualitative research. Stage.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU834

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