Performance prediction of acid-resistant pumps

The key to performance prediction is the calculation of various losses in the pump. The hydraulic losses in centrifugal pumps are mainly losses in the impeller and pump casing (guide vanes). The methods used for performance prediction can be summarized into two types:
Loss model method. By analyzing the physical nature of some hydraulic losses and their influencing factors, the relationship between hydraulic losses and structural parameters is sought, and certain assumptions and simplifications are made on the flow field to establish a calculation model for hydraulic losses. The advantage of this method is that it can fully consider the influence of various factors such as secondary flow, inlet reflux, boundary layer separation, vortex and crisis, and has high practicality and accuracy for actual performance prediction. Therefore, most research institutions and scholars use this method to predict the performance of water pumps.
Numerical method, also known as numerical experiment or computational experiment method. At present, pure numerical methods are mainly based on computational fluid dynamics to simulate the flow field in the pump, obtain the flow field information in the pump (velocity field, pressure field, etc.), and then calculate the relationship between the pump head, power, efficiency and flow rate (performance curve), so as to predict the performance of the water pump. However, due to the limitation of the calculation software functions and the abnormal complexity of the flow, such as unsteady flow, separated flow, vortex flow, etc., the calculation of the internal flow field of the flow-passing components under design conditions is relatively accurate, but the error is large when calculating the flow field within the full flow range, especially the flow field under small flow conditions.