Numerical Simulation And Optimzation Of The Flow Field For 150S-50 Double Suction Centrifugal Pump

Centrifugal Pump is a hydraulic machinery which has been used widely in industry, and plays a very important role in the national economy, such as Power generation, Mining, Metallurgy, Steel, Machinery, Paper making, Construction, Aerospace. Recent decade, Technology of numerical simulation in flow field, which is based on computational fluid dynamic (CFD), is a useful tool to reveal the internal mechanism of turbo machine, and also a effective means for modification and for shorten the developing cycle of turbo machine. Its'the developing trend of computer aided design (CAD) in turbo machine.The main works are as follows:1. Based on a number of documents, the development course of CFD and the application of numerical simulation in centrifugal pump is introduced, so as the present deficiency and development direction.2. A comparison of different coupling models and different simulating methods were taken, and ensure the coupling model and simulating methods for the research of this thesis. Commercial code Pro-E was employed to build the 3D model of 150S-50 suction centrifugal pump, and commercial CFD package Fluent with it's preprocessing code GAMBIT was used to generate the grid and to conduct numerical simulation.3. Calculating methods of disc friction and volumetric loss were summarized, and disc friction and volumetric loss correction scheme were determined on it. The correction scheme was used to calculate the performance data of pump from the flow field information of different simulations. In comparison with the test curve, ensure the loss correction scheme. Then, characteristic curves were drawn. A depth analysis of impeller and volute were also taken.4. Based on the analysis of Numerical simulation result and Flow field, propose the optimization scheme of suction centrifugal pump, modification was taken for saving energy. In the optimization process, propose the method that establish the losses in the impeller as the objective optimization function, then construct objective optimization function and constraints, based on genetic algorithm, using matlab programming, optimization of the objective function for optimal searching, after got the key parameters of the optimized pump, then re-establish the three-dimensional model, using unsteady numerical simulation method, An exam were also taken place to determine if the modification was successful. The results show that energy was saved, and the necessary head of pump was also reached.