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Parametric Design and Tentative Research of Blade in Centrifugal Pump

Author: JiangYunGuo
Tutor: YangJunHu
School: Lanzhou University of Technology
Course: Fluid Machinery and Engineering
Keywords: Centrifugal pump Impeller Wrap angle Placed corner Numerical Simulation
CLC: TH311
Type: Master's thesis
Year: 2010
Downloads: 172
Quote: 1
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Abstract


Centrifugal pumps have a wide range of applications in various sectors of the national economy , China's annual consumption of about 20% of the national power generation capacity in the pump product , and centrifugal pumps account for about 95% of the pump output value . The current national emphasis on energy saving , promotion of low-carbon economy expand more in-depth study of the pump , which requires the majority of the fluid mechanical workers , especially energy-saving principle of centrifugal pumps , methods to improve the efficiency of the centrifugal pump . Centrifugal pump impeller hydraulic efficiency is one of the key factors affecting the efficiency of the pump . Commonly used the conformal variation method designed centrifugal pump impeller has a large arbitrariness One blade wrap angle determined ; second impeller blades line placed in each axis angle value size , that is, in the Grid how to select the variation of the flow line on the expansion plan from the impeller inlet to outlet positioning of angle . Therefore, from these two points of departure . First, for the blade wrap angle . In case of out of the blade , the mouth placed angle has been determined , the proposed new method of a method of determining blade wrap angle . This paper that a unit designed to Q = 200m3 / h , H = 20m , speed n = 1450r/min the impeller diameter not greater than 260mm centrifugal pump , for example , is determined according to the method proposed in this paper leaves wrap angle of 70 °, 80 °, 90 °, respectively impeller design hydraulic model of the impeller , the above design impeller flow field simulation using FLUENT 6.1.22 software : wrap angle of 90 ° impeller efficiency than the wrapping angle 70 ° of about 2 % of the impeller , to prove the feasibility of this method . Secondly, the study Plane Grid axis surface placed angular variation of the centrifugal pump performance . Design a variation of different lines of type , choose 90 ° wrap angle for the optimal design of centrifugal pump impeller . The design of the impeller obtained through simulation verified : in the first half part of the blade , changes in the angle of the disposed angle of the respective axial surfaces ; in the latter half of the blade , the smaller changes in the angle of the disposed angle of the respective axial surfaces , in accordance with such variation compared to the design of a centrifugal pump in the other three variation designed centrifugal pump, its head is reduced by about 1.84m, and efficiency is improved by about 2% .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Pump > Vane pump > Centrifugal pump
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