PIV Measurements of Air Distribution in a Reduced-Scale Model - Ventilation of a Busbar Corridor in a Hydropower Station
PIV Measurements of Air Distribution in a Reduced-Scale Model - Ventilation of a Busbar Corridor in a Hydropower Station
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DOI：
10.1080/14733315.2013.11684004
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发表时间：
2013-06
影响因子：
1.5
通讯作者：
Angui Li;Pengfei Tao;Xin Bao;Yujiao Zhao
中科院分区：
文献类型：
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作者：
Angui Li;Pengfei Tao;Xin Bao;Yujiao Zhao
摘要在相似理论建模的基础上，以阿基米德数Ar为相似参数，采用粒子图像测速（PIV）技术对某水电站母线走廊气流组织进行了分析。在1:50比例模型中进行了9种不同工况的测量，包括0.75G0、G0、1.25 G0三种送风率和0.75Q0、Q0、1.25 Q0三种放热率（G0和Q0为设计值）。从母线廊道内气流形态、能量利用效率、占用区风速和气温均匀性等方面分析评价了9种工况下的气流组织变化规律。实验结果表明，两个送风射流的合流形成附着在占领区地面上的冷气流，且随修正阿基米德数ArQ的增大，附着距离增大。送风方向温度升高时，最大温度升高出现在出口，为5℃，最小温度升高出现在进口，为2℃。工况5的能量利用系数η最大，说明在放热量为7.4 W时，选择0.2 m/s的送风速度可获得较好的经济性。本研究的实验数据为类似类型地下建筑的通风系统设计提供了有益的参考。
Abstract On the basis of modelling with similarity theory and by using the Archimedes number, Ar, as the similitude parameter, this paper analyzes the air distribution of a busbar corridor in a hydropower station by using the Particle Image Velocimetry (PIV) measurement technique. The measurements were conducted in a 1:50 scale model for nine different operating conditions, including three air supply rates: 0.75G0, G0, 1.25 G0 and three heat release rates: 0.75Q0, Q0, 1.25 Q0 (G0 and Q0 are design values). The variation regularity of air distribution for the nine conditions were analyzed and evaluated based on the following aspects: the airflow pattern in the busbar corridor, the efficiency of energy utilization and the uniformity of air velocity and air temperature in the occupied zone. The experimental results show that the confluence of two air supply jets forms a cold airflow attached on the ground of the occupied zone, and that the attached distance increases with larger modified Archimedes number ArQ. For air temperature increasing in the air supply direction, the maximum temperature increase appears at the outlet and is 5 °C, while the minimum temperature increase appears at the inlet and is 2 °C. Moreover, the energy utilization coefficient η in Case 5 is the largest compared with other cases, which illustrates that good economical efficiency in the model can be obtained by choosing 0.2 m/s as the air supply velocity when the heat release rate is 7.4 W. The experimental data of this research provide a useful reference for ventilation system design for similar types of underground buildings.