A Study on the Effects of Porosity on Discharge Coefficient in Cross-Ventilated Buildings Based on Wind Tunnel Experiments
A Study on the Effects of Porosity on Discharge Coefficient in Cross-Ventilated Buildings Based on Wind Tunnel Experiments
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基于风洞实验的交叉通风建筑孔隙率对流量系数的影响研究
DOI：
10.1080/14733315.2006.11683725
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发表时间：
2006
影响因子：
1.5
通讯作者：
M. Kamata
中科院分区：
文献类型：
--
作者：
T. Kurabuchi;Y. Akamine;M. Ohba;T. Endo;T. Goto;M. Kamata
摘要采用风洞实验和CFD分析相结合的方法，研究了均匀来流直接面对和进入开孔时，开孔率对流量系数和气流特性的影响。对0.4% -64%范围内的孔隙率进行评价。风洞实验结果表明，多孔介质的流量系数随孔隙率的增大而增大。CFD分析结果表明，气流通过开口时的收缩与流量系数有关，当气流不收缩时，流量系数增大。当孔隙率增加时，开口上游区域不再发生流管阻滞，从而消除了流动收缩，从而增加了流量系数。当我们评估的应用局限性的局部动力相似模型的孔隙度，该模型的有效性得到证实，以及当孔隙度为16%或更低，无论风向。即使在孔隙率为36%以上的情况下，在气流到达开口之前也沿着壁面流动的条件下，也确认了模型的有效性。
Abstract A study was performed on the effects of porosity on discharge coefficient and airflow characteristics under the condition where uniform approaching flow directly faces to and enters the opening by using wind tunnel experiment and CFD analysis. The evaluation was performed on porosities in the range 0.4% - 64%. The results of wind tunnel experiments suggest that the discharge coefficient increases when the porosity is higher. The results of CFD analysis reveal that the contraction of airflow when it passes through the opening is correlated with discharge coefficient, and that the discharge coefficient increases when flow contraction does not occur. When porosity increases, the retardment of the streamtube ceases to occur in the region upstream of the opening, and this leads to the elimination of flow contraction, hence the increase of discharge coefficient. When we evaluated the limitation of application of the local dynamic similarity model on porosity, the effectiveness of the model was confirmed well when the porosity was 16% or lower regardless of wind direction. The validity of the model was also confirmed under the condition where airflow goes along the wall surface before reaching the opening even when the porosity was 36% or more.
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影响因子：
1.5
作者：
T. Sawachi;N. Ken-ichi;Nobuyoshi Kiyota;H. Seto;S. Nishizawa;Y. Ishikawa
通讯作者：
T. Sawachi;N. Ken-ichi;Nobuyoshi Kiyota;H. Seto;S. Nishizawa;Y. Ishikawa
局部动态相似概念在交叉通风建筑流量系数评估中的应用第2部分
DOI：
--
发表时间：
2005
期刊：
Proceeding of Passive and Low energy cooling for built environment(Palenc 2005) (発表予定)
影响因子：
--
作者：
T.Goto;T.Kurabuchi;et al.
通讯作者：
et al.
交叉通风的局部动态相似模型第2部分局部动态相似模型的应用
DOI：
--
发表时间：
2004
期刊：
The International Journal of Ventilation Vol.2 Num.4
影响因子：
--
作者：
M.Ohba;T.Kurabuchi;M.Kamata;et al.
通讯作者：
et al.
局部动态相似概念在交叉通风建筑流量系数评估中的应用第2部分局部动态相似概念的适用性
DOI：
--
发表时间：
2005
期刊：
Passive and Low Energy Cooling for the Built Environment Vol.I
影响因子：
--
作者：
T.Goto;M.Ohba;T.Kurabuchi;et al.
通讯作者：
et al.