New Inverse Method Of Centrifugal Pump Blade Based On Dynamic Mesh

In recent years,continuous efforts by the researchers and the continuous development of CFD numerical calculation ability raise,numerical analysis capacity for internal flow field of centrifugal pump capacity is also obtained a rapid development,more and more on the study of centrifugal pump,more and more widely,to do this,in the field of research on the direct problem of centrifugal pump is made of a series of scientific research,allow researchers to internal flow of centrifugal pump have deeper understanding.But researchers and scholars have been on the studies of the inverse problem of a centrifugal pump has not been made gratifying achievements,the studies of the inverse problem also more difficult to undertake.This is because the internal flow field in centrifugal pump is very complex,at the current scientific research personnel's experience and numerical calculation method is not entirely familiar with and master the internal turbulence flows,the internal flow field in the geometric shape of no better way to control.Based on the current relevant institute of centrifugal pump blade inverse problem facing the difficulty,in this paper,the main research contents and work are built around the inverse problem method,to this end,this paper proposes a new inverse problem research methods.The main work and achievements are as follows:1.A new method of centrifugal pump blade inverse problem is proposed.The inverse method for centrifugal pump blade based on dynamic mesh and UDF technology,the method of dynamic mesh deformation combine with the UDF technology of Fluent software,achieve control for the centrifugal pump blade.Understand the basic principle and characteristics of dynamic mesh deformation method,control the deformation of the blade every time step by the blade total pressure(load),build control deformation as a function of blade by load,thus through flow field variables can achieve control of the blade shape.This in the study of the inverse problem method to explore new field of research.2.Put forward the dynamic mesh inverse problem method actually belong to the positive and negative iterative method for the inverse problem.According to blade target load and the difference between the actual load of current blade as control variables to control the deformation from one time to the next,achieve automatic deformation of the blade and blade deformation in the process of the remeshing.3.According to the inverse problem method is proposed,based on the inverse problem of dynamic mesh method of centrifugal pump blade through the UDF write calculation program,the program is simple,save calculation time,at the same time have good stability.4.Because of the distribution of load on the impeller blades are not rules,if direct application load on the blade control blade deformation,lead to blade not suitable after deformation,thus affecting the accuracy of the numerical simulation,so in the UDF program to add the function of curve fitting,to load on the blade is pre-processing by least square method,after fitting of the blade deformation results showed:Blade become smooth after using the least squares method fitting of the blade load,the flow field calculation is reasonable.5.Comparisons of the hydraulic performance between the objective blade and the inverse method blade can be seen:Lift and efficiency almost unanimously between the objective blade and the inverse method blade,shows that the proposed centrifugal impeller dynamic mesh inverse method is accurate and rational.