| 引用本文: | 刘俊萍,江楠,许继恩,等.固定式太阳能喷灌系统喷洒水滴动能分布的研究[J].灌溉排水学报,0,():-. |
| Liu Junping,jiangnan,Xu Jien,et al.固定式太阳能喷灌系统喷洒水滴动能分布的研究[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】提高太阳能喷灌系统水力性能的稳定性和能量转换效率。【方法】采用激光雨滴谱仪测量技术，对225.7~1 145 W/m2之间不同光照强度下的固定式太阳能喷灌系统水力特性参数进行试验研究，分析了单个水滴动能、单位体积水滴动能及动能强度等参数的分布规律，并提出了系统能量转换效率的测量及计算方法。【结果】光照强度对单个水滴动能影响主要集中在距离较近处的直径1 mm以下的小水滴；单位体积水滴动能随光照强度的增大先增大后减小并趋于稳定，其径向分布与建立的四次多项式模型拟合较好；动能强度随径向距离的增大而增大，在射程末端迅速减为0，光照强度为300.8~1 018.8 W/m2时波动幅度较小；太阳能喷灌系统能量转换效率在24.59%~37.21%波动，光照强度为225.7~416 W/m2时，系统能量强度转换效率较高，稳定在36%左右。【结论】在光照强度为300.8~416 W/m2时，动能强度波动幅度最小，能量分布更均匀，能量转换效率更高。 |
| 关键词: 太阳能喷灌系统；光照强度；水滴分布；动能强度；能量转换 |
| DOI： |
| 分类号:S277.9 |
| 基金项目:国家重点研发计划项目(2016YFC0400202)；国家自然科学基金项目(51679109)。 |
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| Droplet kinetic energy distribution of fixed solar sprinkler irrigation |
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Liu Junping1, jiangnan2, Xu Jien2, Li Jipeng2, Zhang Qing2
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1.Research Center of Fluid Machinery Engineering and Technology,Jiangsu University;2.jiangsu university
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| Abstract: |
| 【Objective】The existing solar sprinkler irrigation system has problems such as unstable hydraulic performance, uneven energy distribution and low conversion efficiency. The light intensity directly affects the spray performance of the sprinkler irrigation system.【Method】In this paper, laser raindrop spectrometer measurement technology was used to test hydraulic performance parameters under different light intensities between 225.7~1145 W/m2. Experimental research revealed the distribution of the droplet kinetic energy, the kinetic energy per unit volume and the kinetic energy intensity. The measurement and calculation methods of system energy conversion efficiency were proposed. 【Result】The results showed that the influence of light intensity on droplet kinetic energy was mainly concentrated in the small droplets with diameter of less than 1 mm at a short distance. As the light intensity increased, the kinetic energy per unit volume increased first, then decreased and tended to be stable. The kinetic energy per unit volume fit well with the fourth-degree polynomial model established in this paper. With the increase of the radial distance, the kinetic energy intensity got larger and reduced to 0 at the end of the range. When the light intensity changed between 300.8~1018.8 W/m2, the fluctuation range of kinetic energy intensity was small. The energy conversion efficiency of the solar sprinkler irrigation system was between 24.59%~37.21%. When the light intensity is 225.7~416 W/m2, the conversion efficiency of the system energy intensity is highest and stable at about 36%.【Conclusion】In general, when the light intensity is 300.8~416 W/m2, the kinetic energy intensity fluctuation range is the smallest, the energy distribution is more uniform, and the energy conversion efficiency is higher. It provides a theoretical basis for improving the spray performance and energy conversion rate of the solar sprinkler irrigation system, and the optimal configuration of operating parameters in different regions. |
| Key words: solar sprinkler irrigation system; light intensity; droplet distribution; kinetic energy intensity; energy conversion |
