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| Experimental study on comprehensive working performance of Venturi injector |
| WANG Haitao1, CHEN Yanyu2, WANG Jiandong1*, YANG Bin1, MO Yan1 |
| 1.Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 2.Beijing IWHR Corporation, China Institute of Water Resources and Hydropower Research, Beijing 100048, China |
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Abstract In order to obtain some suggestions for optimal structure design of Venturi injector, some comprehensive indicators of working performance for Venturi injector were evaluated. Based on diffe-rent inlet pressure and pressure differences between inlet and outlet conditions, six DN 20 Venturi injectors of different materials were systematically studied for pressure loss, efficiency in absorbing fertili-zer, cavitation-vibration and so on. The results showed that critical pressure difference has an ob-viously positive correlation with inlet pressure. With the same inlet pressure, the maximum rate of flow in absorbing fertilizer for homemade Venturi injector is less than that for the foreign same product universally, and the cavitation and vibration of homemade Venturi injector are sensitive to the variation of pressure. For the same mold size, the material with low mold shrinkage performance has smaller manufacturing error, and its suction performance is better. UPVC could be recommended as one of the pro-per raw materials for the manufacture of Venturi injector. In addition, each Venturi injector has the theoretic upper limit of the suction amount corresponding with its internal structure parameters. The cavitation was strengthened with pressure difference increasing, which was one of the important reasons for the not further improving of the efficiency in absorbing fertilizer.
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Received: 30 July 2017
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