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
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.
王海涛, 陈晏育, 王建东, 杨彬, 莫彦. 微灌用文丘里施肥器综合性能试验研究[J]. 排灌机械工程学报, 2018, 36(4): 340-346.
WANG Haitao, CHEN Yanyu, WANG Jiandong*, YANG Bin, MO Yan. Experimental study on comprehensive working performance of Venturi injector. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(4): 340-346.
[1]彭世彰, 丁加丽. 国内外节水灌溉技术比较与认识[J]. 水利水电科技进展, 2004, 24(4):49-52. PENG Shizhang, DING Jiali. Comparison and understanding of water saving irrigation technology at home and abroad[J]. Advances in science and technology of water resources, 2004, 24(4):49-52.(in Chinese)[2]韩启彪,冯绍元,黄修桥,等. 我国节水灌溉施肥装置研究现状[J]. 节水灌溉, 2014(12): 76-79. HAN Qibiao,FENG Shaoyuan,HUANG Xiuqiao,et al.Research on fertilizer injection units in saving-water irrigation in China[J]. Water saving irrigation, 2014(12): 76-79.(in Chinese)[3]严海军,初晓一. 喉管直径对文丘里施肥器性能影响的数值模拟[J]. 排灌机械工程学报, 2011,29(4): 359-363. YAN Haijun,CHU Xiaoyi. Numerical simulation for influence of throat diameter on Venturi injector perfor-mance[J]. Journal of drainage and irrigation machinery engineering, 2011,29(4): 359-363.(in Chinese)[4]冯瑞珏,洪添胜,李加念,等. 文丘里施肥器控制性能试验分析[J]. 灌溉排水学报, 2011,30(6): 11-14. FENG Ruiyu,HONG Tiansheng,LI Jianian,et al.Expe-riment and analysis on control performance of Venturi injector[J]. Journal of irrigation and drainage, 2011,30(6): 11-14.(in Chinese)[5]韩启彪,黄兴法,刘洪禄,等. 6种文丘里施肥器吸肥性能比较分析[J]. 农业机械学报, 2013,44(4): 113-117. HAN Qibiao,HUANG Xingfa,LIU Honglu,et al. Comparative analysis on fertilization performance of six Venturi injectors[J]. Transactions of the CSAM, 2013,44(4): 113-117.(in Chinese) [6]孔令阳,范兴科. 文丘里施肥器吸肥性能试验研究[J]. 节水灌溉, 2013(7): 4-6. KONG Lingyang,FAN Xingke. Experimental study on fertilizer suction performance of Venturi injector[J]. Water saving irrigation, 2013(7): 4-6.(in Chinese)[7]张晓明,鲍安红,谢守勇,等. 基于 Fluent 的文丘里管结构参数对吸肥性能的影响[J]. 江苏农业科学,2017,45(18): 208-210. ZHANG Xiaoming,BAO Anhong,XIE Shouyong,et al. Effect of structural parameters of Venturi tube on absorption properties of a fertilizer based on Fluent[J]. Jiangsu agricultural sciences, 2017, 45(18): 208-210.(in Chinese)[8]王淼,黄兴法,李光永. 文丘里施肥器性能数值模拟研究[J]. 农业工程学报, 2006,22(7): 27-31. WANG Miao,HUANG Xingfa,LI Guangyong. Numerical simulation of characteristics of Venturi injector [J]. Transactions of the CSAE, 2006, 22(7): 27-31.(in Chinese)[9]严海军,王子君,陈燕. 文丘里施肥器空化过程高速摄像分析[J]. 排灌机械工程学报, 2014,32(10): 901-905. YAN Haijun,WANG Zijun,CHEN Yan.High-speed photography analysis on cavitation of Venturi injector[J]. Journal of drainage and irrigation machinery engineering, 2014,32(10): 901-905.(in Chinese)[10]GHASSEMI H, FASIH H F. Application of small size cavitating venturi as flow controller and flow meter[J]. Flow measurement & instrumentation, 2011, 22(5):406-412.[11]GONCALVES E, DECAIX J, PATELLA R F. Unsteady simulation of cavitating flows in Venturi[J]. Journal of hydrodynamics(Ser B), 2010, 22(5):753-758.[12]DITTAKAVI N, CHUNEKAR A, FRANKEL S. Large eddy simulation of turbulent-cavitation interactions in a Venturi nozzle[J]. Journal of fluids engineering, 2010, 132(12):121301.[13]SAYYAADI H. Instability of the cavitating flow in a venturi reactor[J]. Fluid dynamics research, 2010, 42(5):055503.[14]全国塑料标准化技术委员会.热塑性塑料注射成型收缩率的测定:GB/T 15585—1995 [S].上海:机械工业部上海材料研究所,1995.
