An in-depth discussion was conducted on the leakage problem that occurred during the operation of a hose pump.A simplified two-dimensional Newtonian fluid creep flow model with a single sine wave passing through was adopted to derive the axial velocity distribution of the flow field inside the hose.At the same time,it was found that there is a negative correlation between the leakage amount and the hose gap,pressure difference,deformation section length of the hose,and rotor speed,while there is a positive correlation between the leakage amount and the deformation length of the hose in the x direction and the fluid dynamic viscosity.A detailed analysis was conducted on the flow field of a hose pump with squeezing gaps using a bidirectional fluid structure coupling method.Under the conditions of inlet flow rates of 0.32 m/s and 0.6 m/s,and outlet pressure of 0 MPa,the flow field pressure,flow velocity,and vortex intensity of water and liquid fertilizer,two liquids with significantly different Reynolds numbers,were analyzed in a 180° bend with a curvature radius to hose inner diameter ratio of 4.6.The location of the extreme value of leakage was determined,and the flow field characteristics and their impact on leakage were analyzed.The causes of secondary flow inside the hose were analyzed,and it was found that the fluid inside the hose exhibited symmetric spiral motion.The periodic variation law of flow field vortex intensity and secondary flow intensity was obtained,as well as the conclusion that leakage was positively correlated with axial vortex intensity and negatively correlated with secondary flow intensity.A foundation was laid for reducing the adverse effects of this phenomenon in the future.
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