Development And Performance Analysis Of Aerodynamic Design Program For Supercritical Carbon Dioxide Centrifugal Compressor

Due to the rapid growth of the current demand for energy and the increasing demand for environmentally friendly energy,the supercritical carbon dioxide Brayton power cycle is based on these characteristics,and the current research on the Brayton cycle is also developing rapidly.Since the centrifugal compressor,a key component of the Brayton cycle,has an important impact on the overall cycle,it is meaningful to study the centrifugal compressor.Based on the one-dimensional design theory of centrifugal compressors with traditional working medium,the aerodynamic design method for centrifugal compressors with supercritical carbon dioxide as the working medium is introduced in detail,and the design procedure of supercritical carbon dioxide centrifugal compressors is developed,combined with mathematical loss The model completes the development of the variable working condition performance prediction program on the original basis,and verifies the developed program.Completed the design of supercritical carbon dioxide centrifugal compressor and the performance estimation under variable working conditions.The calculated results and the numerical simulation results are verified,which proves the reliability of the one-dimensional aerodynamic design program and performance prediction program developed in this paper.In this paper,based on the numerical simulation analysis,based on the NUMECA software platform,the research and verification of the numerical simulation method of the supercritical carbon dioxide centrifugal compressor is completed.Taking the main compressor of Sandia National Laboratory as the research object,the comparison between the three-dimensional numerical simulation results and the experimental results proves that the three-dimensional numerical simulation method in this paper has high reliability.By exploring the changes of tip clearance and blade back bend angle,the performance of supercritical carbon dioxide centrifugal compressor is affected.It is concluded that the increase of tip clearance will reduce the efficiency and pressure ratio of the supercritical carbon dioxide centrifugal compressor under small flow conditions and design conditions,but the blocked flow of the compressor will increase under large clearance.Among the impellers with three different blade back bend angles,the centrifugal compressor impeller efficiency is better when the blade back bend angle is48 degrees,and the increase or decrease of the back bend angle will lead to a larger flow loss inside the impeller.