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Experimental study on flow characteristics of a large-scale open jet wind tunnel for outdoor pool fire research
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2021-01-18 , DOI: 10.1016/j.jweia.2021.104522
Jiao Lei , Pengcheng Huang , Linhe Zhang , Yukui Yuan , Wenyang Deng , Shaohua Mao , Jun Zhang

An open jet wind tunnel with an exit area of 23 ​× ​9 ​m2 has been built to study the behaviors of large-scale pool fires under controlled wind conditions. A series of measurements on the mean and fluctuating wind velocities, using arrays of hot-wire probes and ultrasonic anemometers, were extensively performed in the transverse planes at the leading and trailing edges of the pool (28 ​m and 48 ​m to the exit). The entire pool was located in the potential core of the central jet flow region, and the longitudinal velocity (U) and turbulence intensity (Iu) exhibited acceptable uniform distributions within the two vertical planes. The mean turbulence intensities in the two planes were close to those in the flat open grassland and sea (7%–10%). The longitudinal velocity spectra were in good agreement with the Von Kármán spectrum at all levels, and the onset frequency for isotropy was about 1.5–3.0 ​Hz. In the central flow region, the turbulence dissipation rates (ε) were fitted well by ε ​= ​0.067U2.69Iu1.90, and the best-fit line for the turbulent diffusivity (νt) was νt ​= ​0.21U0.95Iu0.98. The detailed mean flow and turbulence characteristics provided the necessary information for the pool fire tests and numerical model verification.



中文翻译:

大型露天射流风洞用于室外游泳池火灾研究的流动特性试验研究

已建立了出口面积为23×9 m 2的开放式射流风洞,以研究在受控风条件下的大型水池火灾的行为。使用热线探针和超声波风速计阵列对池的平均速度和波动风速进行了一系列测量,测量池的前缘和后缘(到出口28 m和48 m处)的横向平面)。整个池位于中央射流区域的潜在核心,纵向速度(U)和湍流强度(I u)在两个垂直平面内均显示出可接受的均匀分布。在这两个平面上的平均湍流强度接近于平坦开阔的草地和海洋中的湍流强度(7%-10%)。纵向速度谱在所有水平上均与VonKármán谱良好吻合,各向同性的起始频率约为1.5–3.0 Hz。在所述中心流动区,湍流耗散速率(ε)通过拟合良好ε  = 0.067 Ü 2.69ù 1.90,而对于湍流扩散(最佳拟合线ν)为ν = 0.21 û 0.95ü 0.98。详细的平均流量和湍流特性为池火测试和数值模型验证提供了必要的信息。

更新日期:2021-01-20
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