Operation practice shows that the axial flow pump, the outer edge of the impeller part due to cavitation and damage, which is caused by the gap cavitation, cavitation phenomenon of two airfoil cavitation.
1. Clearance cavitation:
The liquid in the face and the back of the pressure difference, the gap from the working face to back along the outer edge of 3, in the process of rapid flow, because the pressure drop caused by cavitation. This kind of cavitation has little effect on the performance of the pump, but the gap will increase, which will increase the leakage. According to the experience of the blade coved, can reduce the cavitation.
2. Airfoil cavitation:
On the back of the cavitation often occurs in the outer edge of the airfoil import later. The reason for this kind of cavitation may be due to the anti cavitation performance of the airfoil itself is not good (such as the head of the airfoil is too large or too small, etc.), the external reason is that the device cavitation margin is small.
