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这种室内自动喷灌试验装置是用来研究量雨筒直径及试验持续时间对于集水深度值波动的影响。假定喷头附近处及湿润半径边缘处的水量较中间范围内的变差值大,分别是由于摇臂在喷头附近对喷水的影响以及射流的间断所引起的。水量分布的变差系数(CV)是随量雨筒口径的增大和试验持续时间的增加而减小的。变差量是随单个量雨筒里的集雨量(与试验持时及筒径大小有关)而减小的。因此,CV值能根据试验持时及筒径大小进行估算。此外,当采用较短的试验持时及较大的筒径时,能够获得稳定的CV值。因而为了维持其精度,建议试验中采用较大筒径,缩短试验时间并减少试验次数。
This indoor automatic sprinkler test device is used to study the influence of the diameter and length of the test tube on the fluctuation of catchment depth. It is assumed that the amount of water near the spray head and at the edge of the wet radius is larger than the variation in the middle range due to the influence of the rocker arm on the spray water near the spray head and the jet break. The coefficient of variation (CV) of the water distribution decreases with the increase of the caliber of the rain tube and the increase of the test duration. The amount of variation is reduced with the amount of rainwater collected in a single rain tube (related to the duration of the test and the size of the tube). Therefore, the CV value can be estimated based on the test duration and the diameter of the tube. In addition, stable CV values can be obtained with shorter test hold times and larger tube diameters. Therefore, in order to maintain its accuracy, it is recommended to use a larger test tube diameter, shorten the test time and reduce the number of tests.