Physical Model Experimental Analysis Of Bidirectional Shaft Tubular Pump Device

Based on the two-way cross flow pump station of Dingbo water conservancy project in Jiangyin City, the energy characteristics, cavitation characteristics and runaway characteristics of the model device of the two-way shaft cross flow pump are tested, and the performance test data of the two-way shaft cross flow pump device in the forward and reverse operation are obtained. The results show that the flow pattern of the two-way cross flow pump is stable without vortex and the operation of the pump is stable. When the blade angle is - 4 degrees, the physical model efficiency of the two-way Shaft Tubular pump is 70.95% under the condition of 3.05 m forward design head and 57.39% under the condition of 1.43 m reverse design head; the cavitation performance of the pump near the forward and reverse design heads is the best, and the critical necessary NPSH is less than 8 m. When the maximum positive net head is 2.99 m, the maximum runaway speed of the prototype pump is 1.50 times of the rated speed of the pump; when the maximum negative net head is 2.57 m, the maximum runaway speed of the prototype pump is 1.13 times of the rated speed of the pump; the smaller the blade angle, the higher the unit runaway speed.