| Water ring vacuum pump uses liquid as the intermediate medium for energy conversion,belongs to the fluid machinery pumping gas,has the advantages of simple structure,isothermal compression and so on,is widely used in metallurgy,mining and other industries.Due to the complex gas-liquid two-phase flow inside,the internal flow field is unsteady flow,resulting in low inspiratory capacity and energy efficiency.The main factors affecting hydraulic performance of water ring vacuum pump include impeller structure,shell shape line,radial clearance and axial clearance.Impeller is an important part of energy conversion,and its structural parameters determine the shape of the flow channel of the water ring vacuum pump,which has an important influence on the hydraulic performance of the water ring vacuum pump.In this paper,2BEA-703water ring vacuum pump was taken as an example,and the optimization method design and mechanism analysis were carried out on the impeller parameters and blade profile,so as to improve the suction capacity,isothermal compression efficiency and energy efficiency.In this paper,numerical simulation,Bezier curve optimization and response surface experiment model are used to study the high energy efficiency design method of impeller blade of water ring vacuum pump.The main research conclusions are as follows:(1).Based on Sketch Up Pro 2022 software,the blade profile of water ring vacuum pump was parameterized,and the influence of blade envelope Angle on the performance of water ring pump was studied,which provided method support for the optimization of parameter combination.Firstly,five-point quadric Bezier spline curve blade profile was selected to achieve fitting control.Secondly,based on the prototype pump size,the control points of Bezier curves are changed to achieve the optimal deformation of blade profile.(2).Fluent 18.0 was used for numerical simulation,and the suction capacity of the CFD numerical model of the water ring vacuum pump was studied,and the simulation calculation of the water ring vacuum pump was realized.The flow law of the flow field inside the pump is obtained by analyzing the cloud diagram of the internal flow field,which provides a theoretical basis for optimizing the size and structural parameters of the pump.By comparing the vacuum degree and point gas volume between the actual working conditions and the simulated data,it is concluded that the reliability of this method for the simulation of 2BEA-703 water ring vacuum pump VOF is up to 97%.(3).Based on the response surface method theory,the BBD optimization experiment was designed,and the inspiratory volume of water ring pump was taken as the optimization objective to calculate and analyze,and the optimal parameter combination was selected.Firstly,by calculating the sensitivity of seven structural parameters of impeller blade,five parameters with great influence were selected as the experimental variables of response surface.Through the response surface surface,the interaction between various parameters was obtained,the changes of internal phase state,pressure and turbulent kinetic energy were analyzed,the changes of internal flow field and external characteristics were observed,and the optimal combination of impeller blade structural parameters was determined.(4).Based on the response surface diagram and the regression equation model,the results verify the inevitable relationship and law between the impeller blade parameter combination and the hydraulic performance of the water ring vacuum pump.The optimization results show that the work of the working liquid on the gas is more sufficient,and the gas volume is increased by 77.43m~3/min.Inspiratory capacity per unit power is energy efficiency increased by 5.84m~3/(kw·h).The results show that the research method in this paper can obtain the optimal combination design of the structure parameters of the impeller blade of the water ring vacuum pump,which provides the method support for the deformation of the vane profile of the water ring vacuum pump,and provides the parameter index for the further improvement of the design of the impeller blade of the water ring vacuum pump. |
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