Abstract: To analyze the effect of solid-liquid mixture on the performance of double-channel delivery pump, hydraulic performance test of double-channel pump delivering solid-liquid media with different concentration and flow rate is carried out and the wear of pump is analyzed. The average diameters of solid used in the test are 10 and 36 mm. The hydraulic test results show that at a certain flow rate the inlet pressure, outlet pressure, head and efficiency of pump decrease with the increase of concentration of solid in the delivered mixture. Compared with delivering clear water, when solid-liquid medium is delivered the shaft power rises quickly, while the head drop is almost the same at different flow rate. The efficiency at different flow rate is lower than that in delivering clear water, and the difference of efficiency increases with the increase of flow rate. At same flow rate and concentration ratio, the inlet and outlet pressure, head and cavitation performance of pump decrease obviously in delivering relatively big diameter solid. The analysis on the wear of double-channel pump shows that the worn positions of impeller are outer edge of front shroud, channel surface on the front shroud side, inlet edge of pressure surface. The wear zone of pressure face shows a triangle. The worn sections of pump casing are volute periphery, volute tongue and casing ring. This research provides test basis for the theoretical research, design and application of solid-liquid double-channel centrifugal pump.

Key words: Double-channel pump, Hydraulic experiment, Solid-liquid, Wear