Centrifugal Compressor Flow Field For Hydrogen-burning Turbine Range Extender Characteristic Analysis

With the development of new energy vehicles,many disadvantages of traditional fuel powered vehicles in environmental protection have gradually emerged,such as insufficient power,high fuel consumption,emission pollution and other problems.Hydrogen fired turbine range extender can solve these problems well.The main component of the hydrogen fired turbine range extender is the centrifugal compressor,which plays an important role in increasing the pressure ratio and reducing consumption.However,due to the complexity of the impeller structure and internal flow field in a centrifugal compressor,its design and calculation are difficult.To further improve the performance of a centrifugal compressor,it is necessary to conduct simulation analysis and optimization design of the centrifugal compressor impeller based on its impeller inlet parameters.The main research content of this article is as follows:(1)This paper describes the working principle of the hydrogen burning turbine range extender and the centrifugal compressor,introduces the relevant research on the internal flow field characteristics of the centrifugal compressor,and summarizes the optimal design method of the centrifugal compressor.(2)Taking a certain type of centrifugal compressor as an example,a threedimensional model of the centrifugal compressor was established using finite element analysis software ANSYS.On this basis,the single channel model is meshed and the flow field of the channel is numerically simulated using ANSYS-CFX.(3)The performance and internal flow characteristics of centrifugal compressor impeller were studied and analyzed according to different trailing edge configurations and different inlet angles of shunt blades.(4)The influence mechanism of coupling effects of different trailing edge configurations and different inlet angles on impeller characteristics and internal flow field was studied.Aiming at the three types of blades with high isentropic efficiency and high pressure,the variation rules of centrifugal compressor impeller performance and internal flow characteristics were analyzed under different impeller edge inlet angles and blade trailing edge configurations.(5)Using Opti SLang software to parameterize the modeling of the impeller,with the aim of improving pressure ratio and isentropic efficiency as optimization objectives,combined with the integrated Latin high cube method,parameter sensitivity analysis based on Co P matrix and Co P response surface,and the optimal predictive metamodel MOP,multi-objective optimization of the impeller was carried out.