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| Performance analysis of “bypass suction” mode of parallel four-venturi tube fertilizer applicator |
| WANG Yongtao1,2, LIU Jian1*, LI Jiachun3, CAI Jiabin3, LI Jixue3, YANG Tao3 |
| 1. State Key Laboratory of Advanced Design and Manufacturing For Vehicle Body, Hunan University, Changsha, Hunan 410082, China; 2. Guizhou Institute of Water Resources Science, Guiyang, Guizhou 550002, China; 3. School of Mechanical Engineering, Guizhou University, Guiyang, Guizhou 550025, China |
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Abstract In order to understand the performance of “bypass suction fertilizer” mode of Venturi tube fertilizer applicator,on the base of its working principle, four venturi tube parallel fertilizer applicators are designed.Some of the parameters are La=105 mm, Lb=55 mm, the length on both sides of the four-way T-shaped outlet is L1~L8=36 mm. The inner diameter of the inner tube channel is 50 mm. In the parallel four Venturi tube fertilizer applicator, the suction inlet is 1 atmospheric pressure, the nutrient solution outlet is 0.1 MPa, and the pressure at the water inlet is 0.15 MPa, 0.25 MPa, 0.35 MPa, 0.45 MPa, 0.55 MPa, 0.65 MPa. The FloEFD software is used to simulate and analyze the amount of ferti-lizer absorbed by the fertilizer applicator, and the working characteristics of the fertilizer absorption of each channel and the pressure difference between the inlet and outlet are positively correlated. Based on the analysis results, a fertilizer suction pump was further added to the outlets of the four Venturi tube parallel fertilizer applicators to form four fertilizer suction channels + bypass fertilizer suction type pipeline fertilizer applicator(“bypass suction fertilizer” mode). The performance simulation results show that the “bypass suction” mode of the four-Venturi tube fertilizer applicator in parallel can improve the overall fertilizer absorption by more than 31.08%, reduce the variance by 74.12%, and rea-lize the pressure output of the nutrient solution. Furthermore, the performance test of the “bypass ferti-lizer absorption” mode of the parallel four-Venturi tube fertilizer applicator is carried. The average measured fertilizer capacity was 693.25 L/h, and the average relative error with the simulation analysis data was only 4%, which verified the simulation results. The research laid a foundation for the development of the “bypass suction” mode of the parallel four-Venturi tube fertilizer applicator.
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Received: 22 July 2019
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