引黄滴灌系统离心过滤器泥沙去除规律试验研究OA

The effective removal of sediment is the key in solving clogging issues and improving irrigation quality for the Yellow River diversion drip irrigation systems.This study investigates the influence pat-terns of centrifugal filters on sediment removal efficiency under different flow rate conditions and sediment characteristics.This method adjusts core parameters such as flow velocity and sediment concentration in physical model tests for a better removal efficiency.The results indicate that the relationship curve be-tween sediment removal rate and flow velocity of the Yellow River water exhibits a U-shaped pattern.The removal rate is high(up to 60%)in both the low-velocity(1.0-1.4 m/s)and high-velocity(2.2-2.7 m/s)ranges,but low in the 1.5-1.7 m/s range.At low velocities,the removal of fine particles(≤75 μm)is primarily dominated by gravity settling;whereas at high velocities,the enhanced centrifu-gal force favors the separation of coarse particles(>100 μm).Sediment concentration significantly af-fects removal efficiency.When sediment concentration increases to 4 kg/m3,the entrainment effect im-proves the removal rate of particles in the range of 50-100 μm;however,when concentration becomes excessively high(5 kg/m3),increased inter-particle collisions cause interference,leading to a decline in removal efficiency.Regarding to the Yellow River water which is dominated by sediment of fine particles,it is advisable to operate the filter at low velocities(1.0-1.4 m/s)to reduce energy consumption;whereas high velocities(2.2-2.7 m/s)are required under conditions of coarse particles or high con-centration to intensify centrifugal separation.This study provides a reference for optimizing operational parameters and filter structure design in practical applications.