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并联四文丘里管施肥器“旁路吸肥”模式性能分析

Performance analysis of ″bypass suction fertilizer″ mode of parallel four-Venturi tube fertilizer applicator

  • 摘要: 为了了解文丘里管施肥器"旁路吸肥"模式的性能,在其工作原理的基础上,设计了4个文丘里管并联的施肥器,其部分参数为La=105 mm,Lb=55 mm,四通T型出口两侧长度L1~L8=36 mm,文丘里管通道内径均为50 mm.在并联四文丘里管施肥器吸肥口为1个大气压力,营养液出口为0.10 MPa,进水端入口压力分别为0.15,0.25,0.35,0.45,0.55,0.65 MPa的边界条件下,运用FloEFD软件对施肥器吸肥量进行仿真分析,得到了各通道吸肥量与进出口压差呈正相关的工作特性.基于该分析结果,进一步在4个文丘里管并联施肥器的出口增设吸肥泵,构成四吸肥通道+旁路吸肥式管路施肥器("旁路吸肥"模式),通过性能仿真表明:并联四文丘里管施肥器"旁路吸肥"模式,可提高吸肥量整体提高31.08%以上,方差降低74.12%,同时实现将营养液有压输出.进一步开展并联四文丘里管施肥器"旁路吸肥"模式吸肥量性能试验,得出实测平均吸肥量为693.25 L/h,与仿真分析数据平均相对误差仅为4%,验证了仿真分析结果.该研究为并联四文丘里管施肥器"旁路吸肥"模式整机的研制奠定了基础.

     

    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 fertilizer applicators were designed. Some of the parameters are La= 105 mm,Lb= 55 mm,the length on both sides of the fourway 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 0.10 MPa,and the pressure at the water inlet is 0.15,0.25,0.35,0.45,0.55 and0.65 MPa. The FloEFD software was used to simulate and analyze the amount of fertilizer absorption by the fertilizer applicator,and the working characteristics of the fertilizer absorption of each channel and the pressure difference between the inlet and outlet were positively correlated. Based on the analysis results,a fertilizer suction pump was further added to the outlets of the parallel four-Venturi tube 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 fertilizer″ 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 realize the pressure output of the nutrient solution. Furthermore,the performance test of the ″bypass suction fertilizer″ mode of the parallel four-Venturi tube fertilizer applicator is carried. The average measured fertilizer capacity is 693.25 L/h,and the average relative error with the simulation analysis data is only 4%,which verifies the simulation results. The research lays a foundation for the development of the ″bypass suction fertilizer″ mode of the parallel four-Venturi tube fertilizer applicator.

     

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