Investigation On The Optimization Of The Liquid-ring Pump Case Based On Direct Free Form Deformation Method

Liquid-ring pump is widely used in chemical industry,coal mine,pharmaceutical industry,petrochemical,power generation,food and waste gas recovery,etc.,because it has simple structure,isothermal compression,easy to use and convenient for sucking and compressing flammable and explosive gas.Because of its extensive use of performance,the researchers have done in-depth and detailed analysis of the study,through the study that the performance of liquid-ring pump has a lot of structural parameters,such as impeller,shell line,shape size,the location of the exhaust port shape and ejector,etc.,which may seriously affect the performance of liquid-ring pump.But these years,domestic and foreign researchers mostly only on the liquid-ring pump internal flow numerical calculation and the impact of the ejector,done a lot of researches,but the shell line on the performance of liquid-ring pump,this research is not enough.Therefore,the main work of this paper is to optimize the liquid-ring pump shell line,in order to achieve the purpose of optimizing the performance of liquid-ring pump.A new deformation control method of liquid-ring pump housing profile is proposed,and the optimization of the shell line of liquid-ring pump is carried out by using the response surface method.The main work content and results are as follows:1.A new deformation control method of liquid-ring pump shell line is proposed.Based on the direct free surface deformation of the liquid-ring pump shell line deformation control method,according to the experimental design requirements,combined with the direct free surface deformation method of mathematical principles,to construct an effective deformation function,in order to achieve the shell line direct,accurate parametric deformation control.2.According to response surface analysis.In the control variable space,the shell line is experimentally designed and combined with the direct free-surface deformation method to control the deformation of the shell line.The relationship between the vacuum and the efficiency of the inlet ring and the inlet vacuum is obtained,and the vacuum degree and efficiency of the inlet ring pump are optimized.The calculation case shows that the pump case profile has a greatly effect on hydraulic performance of liquid-ring pump.The pump efficiency and inlet vacuum pressure can be improved within a certain range.The pump case profile with higher area expansion ratio for the suction zone would result in the higher inlet vacuum pressure,and the pump efficiency is on the contrary.With the increase of pump inlet vacuum,the pump efficiency is approximately linear decreasing in the design variable space.3.According to the proposed method of direct free surface deformation control,a deformation control calculation program of liquid ring pump shell line based on direct free surface deformation method is developed.The method can realize the shape deformation of the object ideally.And the preparation of the liquid ring pump shell line response surface optimization analysis program,you can quickly and easily achieve the liquid ring pump shell line optimization。4.The results show that the inlet vacuum of the liquid ring pump is reduced at the beginning of the suction zone with the increase of the distance between the impeller and the inner wall of the shell,and the distance between the impeller and the inner wall of the shell and the inlet vacuum increases with the ratio of the flow path area between the beginning and the end of the suction zone.The opposite is true of the change in efficiency.