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| Field combination experiment on impact sprinklers with aerating jet at low working pressure |
| XU Zhengdian, XIANG Qingjiang*, WAQAR A Q, LIU Jun |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to examine effects of irrigation uniformity improvement between aeration sprinkler and impact sprinkler, the performances of two kinds of sprinklers were compared by field combination experiment when the sprinklers were working at low pressure. An aeration sprinkler was designed based on the structure of existing impact sprinklers by involving an air-liquid two phase jet. The combination sprinkler irrigation was evaluated by using average sprinkler irrigation intensity(including measured and theoretical values)and Christiansen uniformity coefficient. Particularly, effects of working pressure and sprinkler combination space on Cu were discussed. The experimental data show that the difference in average sprinkler irrigation intensity between theory and measurement was less than around 5% for both the types of sprinkler. It means that the wind evaporation and drift loss was small under the low pressure and breeze wind condition, and the performances of two types of sprinklers are comparable under this condition. When the sprinkler combination space is equal to one jet range, the experimental irrigation uniformity coefficient is increased in the aeration sprinkler, especially, the coefficient has reached and exceeded 75% that is specified in a national technical standard of China. When the combination spaces are 1.0, 1.1 and 1.2 times the jet range, respectively, the experimental irrigation uniformity coefficient of the aeration sprinkler is better by about 2.2%-5.8% than the impact sprinkler in the same model size.
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Received: 10 May 2018
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