由室内试验资料推求有风条件下的喷灌均匀度

The uniformity calculation of sprinkler irrigation under wind condition using indoor experimental data

喷灌均匀度是衡量喷灌系统性能好坏的一项重要参数。通过对有风条件下喷洒水滴运行规律的研究,得出了水滴在空气中运行轨迹的微分方程,再根据喷头做旋转运动时某一方向上的喷水总量固定不变的规律,对室内无风条件下获得的试验资料进行修正,最终得到有风条件下的单喷头等雨深线图。将该成果用于组合均匀度的计算并与实测值进行比较,结果表明:计算值与实测值的相对误差最大为3.80%,平均相对误差为2.26%,因此该计算模型可以用于指导喷灌工程实践。

The uniformity of sprinkler irrigation is an important parameter which can be used to measure the property of sprinkler irrigation system. A differential equation of moving trace of droplet in the air was obtained through the research of spray droplet moving rule under wind condition. Then corrected experimental data were obtained from calm condition （indoor） based on the rule of spray water fixed for certain directions when nozzle rotated and got the water depth contour map of single nozzle under wind condition. Combinatorial sprinkler uniformity calculation and its comparison with the measured values showed that the maximal relative errors between the calculated values and measured values was 3.80% with an average value of 2.26%. Therefore, the calculation model can be used to supervise practice of sprinkler irrigation pro- jects.