|
|
Injection performance of Venturi injector in micro-irrigation system |
Yan Haijun1, Chu Xiaoyi1, Wang Min1, Ma Zeyuan2 |
(1.College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Beijing East Interlink Eco-tech Co.Ltd., Beijing 100084, China) |
|
|
Abstract In order to study the relationship between the injection performance and the structural parameters of Venturi injector used in micro-irrigation system, injection performance tests of a kind of Venturi injector with four types of replaceable throat parts were conducted under inlet pressures of 0.10, 0.15, 0.20, 0.25 and 0.30 MPa, respectively. The results show that both the critical and maximum pressure differences are in positively linear relation with the inlet pressure. The inlet flow rate of the Venturi injector increases with the increasing of the inlet pressure or the difference between inlet and outlet pressures. As the ratio of outlet pressure to inlet pressure is less than 0.4, the ratio of injection rate to outlet flow rate increases with the decrease of the throat diameter and the increase of both the contraction and diffusion angles. As the ratio of outlet pressure to inlet pressure is greater than 0.4, the ratio of injection rate to outlet flow rate changes in an opposite trend. The established regression models describing the relationship between injection performance, throat geometry and working parameters can be used for design and operation of Venturi injector.
|
Received: 03 November 2009
Published: 30 May 2010
|
|
|
|
[1]封俊, 沈雪民, 刘春和, 等. 文丘里滴灌施肥器水力性能的研究[J]. 节水灌溉,1992(1):41-43.Feng Jun, Shen Xuemin, Liu Chunhe, et al. Research on the hydraulic performance of Venturi injector in drip irrigation[J]. Water Saving Irrigation, 1992(1):41-43.(in Chinese)[2]沙毅, 侯素娟. 并联式文丘里管施肥器试验研究[J]. 排灌机械, 1995, 13(2):37-39.Sha Yi, Hou Sujuan. Experimental research on applying fertilizer apparatus of parallel Venturi tubes[J]. Drainage and Irrigation Machinery, 1995, 13(2):37-39. (in Chinese)[3]侯素娟. 两段式文丘里泵施肥器的设计[J]. 排灌机械, 1995, 13(4):44-46.Hou Sujuan. Design of Venturi injector with two components [J]. Drainage and Irrigation Machinery, 1995, 13(4):44-46. (in Chinese)[4]李百军, 毛罕平, 李凯. 并联文丘里管吸肥装置的研究及其参数选择[J]. 排灌机械, 2001, 19(1): 42-45. Li Baijun, Mao Hanping, Li Kai. A study on the parallel connection Venturi tube and its parameter selection[J]. Drainage and Irrigation Machinery, 2001, 19(1): 42-45. (in Chinese)[5]金永奎, 夏春华, 方部玲. 文丘里施肥器系列的研制[J]. 中国农村水利水电, 2006(5):14-16.Jin Yongkui, Xia Chunhua, Fang Buling. Rearch and development of Venturi fertilizer applicator series[J]. China Rural Water and Hydropower, 2006(5):14-16. (in Chinese)[6]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)[7]Lima Neto I E, De Melo Porto R. Performance of low-cost ejectors[J]. Journal of Irrigation and Drainage Engineering, 2004, 130(2):122-128.[8]龙新平, 程茜, 韩宁, 等. 射流泵空化流动的数值模拟[J]. 排灌机械工程学报, 2010, 28(1):7-11.Long Xinping, Cheng Qian, Han Ning, et al. Numerical simulation on cavitating flow within jet pump[J]. Journal of Drainage and Irrigation Machinery Engineering, 2010, 28(1):7-11. (in Chinese)[9]Reader-Harris M J, Brunton W C, Gibson J J, et al. Discharge coefficients of Venturi tubes with standard and non-standard convergent angles[J]. Flow Measurement and Instrumentation, 2001, 12(2): 135-145. [10]Kranz W L, Eisenhauer D E, Parkhurst A M. Calibration accuracy of chemical injection devices[J]. Applied Engineering in Agriculture, 1996, 12(2):189-196.[11]Ozkan F, Ozturk M, Baylar A. Experimental investigations of air and liquid injection by venturi tubes[J]. Water and Environment Journal, 2006, 20(3):114-122.[12]Steven R. A dimensional analysis of two phase flow through a horizonally installed Venturi flow meter[J]. Flow Measurement and Instrumentation, 2008, 19(6):342-349. |
|
|
|