| 引用本文: | 谈明高,云天平,吴贤芳,等.喷头数量对光伏喷灌系统运行特性的影响[J].灌溉排水学报,2021,(9):79-84. |
| TAN Minggao,,YUN Tianping,W.1U Xianfang,et al.喷头数量对光伏喷灌系统运行特性的影响[J].灌溉排水学报,2021,(9):79-84. |
|
| 摘要: |
| 【目的】探讨喷头数量对无蓄电池光伏灌溉系统运行特性的影响。【方法】搭建光伏灌溉系统试验台，采用试验测量的方法获得不同喷头负载数量下的系统性能。【结果】①不同负载下的喷头压力均随着光照强度变化而变化，变化幅度随着光照强度区间增大而降低，2负载的饱和光照强度比4负载低了300 W/m2；②随着系统负载喷头数量增大，喷头饱和工作压力逐渐降低，2负载饱和压力约为450 kPa，4负载饱和压力约为435 kPa，喷头达到饱和压力所需光照强度逐渐升高；③随着喷头数量增大，喷头径向降水量逐渐减少，喷头各段之间降水量差值逐渐减小，2负载的径向水量分布结构为较差的“梯形分布”，4负载的径向水量分布结构为较好的“三角形分布”；④喷灌均匀系数随着负载喷头数量增加而增大，4喷头最大均匀系数比2喷头大2%。【结论】随着喷头负载数量增大，系统饱和光照强度增大，喷头饱和压力减小，泵扬程、转速、流量随光照强度瞬态变化的幅度逐渐减少，泵流量-扬程曲线与管路特性曲线的交点右移，系统在较大流量工况下运行，喷头工作压力降低，喷灌均匀性更好。 |
| 关键词: 光伏；喷灌；喷头数量；泵 |
| DOI：10.13522/j.cnki.ggps.2020662 |
| 分类号: |
| 基金项目: |
|
| The Effect of Nozzle Numbers on Operation of Photovoltaic Sprinkler Irrigation Systems |
|
TAN Minggao, YUN Tianping, W.0U Xianfang, MA Haochen, LIU Houlin
|
|
(1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China;
2.Zhenjiang Fluid Engineering Equipment Technology Research Institute, Jiangsu University, Zhenjiang 212013, China;
3.School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;
4.School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China)
|
| Abstract: |
| 【Objective】Photovoltaic has been increasingly used to power irrigation systems in China, but optimizing its power output and operating load is an issue that is poorly understood. This paper aims to address this by taking sprinkler irrigation systems powered by photovoltaic as an example.【Method】The photovoltaic system used in this work was battery-free, and the experiment was conducted in a test rig in which the operation of the system under different nozzle numbers was measured and compared.【Result】①Water pressure in the nozzles varied with light intensity, and the variation decreased as the duration of light intensity increased. The saturated light intensity under two loads was 300 W/m2, lower than that under four loads. ②With the increase in the number of sprinkler nozzles, the saturated working pressure in the nozzles decreases. The saturated water pressure in the sprinklers under two nozzles was about 450 kPa, and it reduced to 435 kPa when the nozzle numbers increased to four, indicating that the illumination intensity required to reach the saturated pressure in the sprinkler system increased as the number of nozzles increased. ③With the increases in sprinkler head numbers, the falling of water droplets in the radial direction and the difference in water droplets between the sprinkler sections both decreased. Water distribution under two nozzles was approximately trapezoidal, while under four nozzles the distribution became triangle from where the nozzles were to the far ends. ④The uniformity coefficient of the sprinkler irrigation system increased as the number of nozzles increased, and the maximum uniformity coefficient under four sprinkler nozzles was 2% larger than that under two nozzles.【Conclusion】Increasing the number of nozzles can increase the saturated light intensity of the system and reduced the saturated water pressure in the nozzles. The light-height of the pumps, rotational speed and flow rate all decreased as the light intensity transient amplitude increased. The pump flow, head curve and the pipeline characteristic curve move to the right of the intersection point, and the system running at fast flow condition can reduce nozzle pressure and improve sprinkler irrigation uniformity. |
| Key words: photovoltaic; sprinkler irrigation; nozzle numbers; pump |
