Closure to “Aerated flow characteristics of skimming flow over stepped chutes”
Closure to “Aerated flow characteristics of skimming flow over stepped chutes”
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关闭“阶梯式溜槽撇流的曝气流动特性”
DOI：
10.1080/00221686.2013.861365
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发表时间：
2013
影响因子：
2.3
通讯作者：
I. Ohtsu
中科院分区：
文献类型：
--
作者：
M. Takahashi;I. Ohtsu
图 D3 (a) 校正系数 CP 和 (b) Cv，θ= 26.6°，台阶高度 s1= 4.4 cm，s2= 8.9 cm，溜槽宽度 B1= 178.8 cm，B2= 111.1 cm，所有模型尺寸均一流动区域。对于这些数据，S= s/dc 的影响并不显着，因为分散度很大（图 D2）。请注意，除了发生过渡流的两次实验（在图 D2 中标记）之外，所有实验均处于撇渣流状态。对于 θ= 26.6°、30° 和 50°，数据结果分别为 Vave/Vw= 1.189±0.084、1.117±0.048 和 1.072±0.041（平均值±标准差）。与作者的发现相反，速度比随着溜槽角度的增加而减小。对于给定的 θ，该比率随着 S 的增加而减小，与作者类似。当值高达 1.3 时，讨论者数据的速度比远高于作者图 9 中的速度比。请注意，Wood (1985) 提出，对于 θ= 45° 的阿维莫尔大坝的平滑溢洪道，Vave/Vw= 1.20。
Figure D3 (a) Correction coefficient CP and (b) Cv with θ= 26.6◦ for step heightss1= 4.4 cm, s2= 8.9 cm, and chute widthsB1= 178.8 cm, B2= 111.1 cm, all model dimensions uniform flow regions. The effect of S= s/dc is not prominent for these data, as the scatter is significant (Fig. D2). Note that all experimental runs were in the skimming flow regime except for two where transition flow occurred (marked in Fig. D2). The data result in Vave/Vw= 1.189±0.084, 1.117±0.048, and 1.072±0.041 (mean±standard deviation) for θ= 26.6◦, 30◦, and 50◦, respectively. In contrast to the authors’ findings, the velocity ratio decreases with increasing chute angle. For a given θ, the ratio decreases with increasing S in analogy to the authors. With values up to 1.3, the velocity ratios of the discussers’ data are considerably higher than from the authors’ Fig. 9. Note that Wood (1985) proposed Vave/Vw= 1.20 for the smooth spillway of the Aviemore Dam with θ= 45◦.