Research On The Modern Design Method Of Centrifugal Pump And Project Realization

The purpose of this thesis is focused on the modern design method of centrifugal pump, which base on the improved traditional design method, experimental technology and Computational Fluid Dynamics (CFD) technology.The modern design method of centrifugal pump was produced by the analysis of the traditional design method and taking advantage of the rapid development of the CFD technology. Detailed contents and methods of modern design of centrifugal pump were studied, and it was used to design new pump models which took on better performance than the traditional products.The schemes to mend and improve affinity law and velocity coefficient method of centrifugal pump were analyzed, and the traditional design method was improved through three aspects as follows: 1) design on database of hydraulic model with excellent cavitation characteristic;2) design on the performance curve of pump without hump;3) design on non-overload pump.The structure of database of hydraulic model with excellent cavitation characteristic and the design process of the database are completely described, and the building of illustrational database of the single-stage pump and multi-stage pump were presented.With the analysis of forming mechanism of the actual Quantity - Head curve of centrifugal pump, the relation of slope and hump of theoretical Quantity - Head curve of centrifugal pump was derived mathematically, and the relation of specific speed and curve slope was presented.Through the analysis of the practical applications and overload phenomena of the centrifugal pump, the new thought of non-overload design method was presented, and the methods to precede the non-overload characteristic were studied.By taking advantage of the newly improvement of CFD technology, the basic theories and methods of numerical simulation of internal flow of the centrifugal pump were introduced.The internal flow of the centrifugal pump was simulated by applying the CFD software and the hydraulic performance and cavitation performance were predicted based on the numerical results of flow field. The results of prediction and the results of test are preferable similar.Finally, four different hydraulic models were designed by applying the modern design method of centrifugal pump presented in this paper. The test results show that the new development models achieve the requirements of design perfectly.The work of this paper builds the preliminary modern design method of centrifugal pump, points out the shortcomings of current research at the end of the paper, and forecasts the further improvement of correlative work.