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灌溉系统的均匀度对于灌溉效率、农作物产量和经济效益都至关重要。而风对均匀度则具有强烈的影响。本文介绍了模拟喷灌系统在风中运行的方法。给出了描述水滴在空中运动的公式,使得从喷头喷出的水滴的运动轨迹可用数学方法计算出来。而根据各个计算结果就可预测喷水的图形。利用其喷洒水滴大小的组成来预测喷头周围的喷水图形。将这样水量分布图形进行叠加,其结果就代表一个非连续移动系统的灌水状态。然后即可计算出均匀系数,将预测的和实测的灌水图形进行比较,证实了模型的合理性。并对单喷头和多喷头的试验作了比较,这种模拟系统看来是预报在风中喷灌性能的有效工具。使用这类模型,可以改进喷头的设计。然而风向的变化会影响预报的精度。
The uniformity of the irrigation system is crucial for irrigation efficiency, crop yield and economic efficiency. The wind on the evenness has a strong impact. This article describes the method of simulating a sprinkler system operating in the wind. The formula describing the movement of water droplets in the air is given, so that the trajectories of water droplets ejected from the nozzles can be calculated mathematically. According to the results of each calculation can predict the water spray graphics. Use the composition of the sprayed droplet size to predict the spray pattern around the sprayhead. Stacking this pattern of water distributions results in the irrigation of a discontinuous moving system. The uniform coefficient can then be calculated, comparing the predicted and measured irrigation patterns, confirming the rationality of the model. A comparison was also made between the single-nozzle and multi-nozzle tests, which appears to be an effective tool to predict sprinkler performance in the wind. Using this type of model, you can improve the nozzle design. However, the change of wind direction will affect the accuracy of prediction.