摘要
离心压缩机广泛应用于商用空调系统中,气悬浮技术是离心式制冷压缩机重要发展方向之一,但需承载压缩机轴向力的气体轴承的承载能力较小。因此,以离心式制冷压缩机闭式叶轮为研究对象,采用数值方法对叶轮在全工况下的轴向力进行了模拟分析。研究结果表明:当压缩机运行于稳定工况范围时,叶轮轴向力随压比的增大而减小,随流量的减小而减小,但当压缩机工作点接近喘振区和阻塞区时,轴向力明显增大;叶轮轴向力随转速的增大而减小,密封直径对叶轮所受轴向力影响较大;设计工况下的轴向力数值计算与理论计算的误差为4.4%。
Centrifugal refrigeration compressors are widely used in commercial air-conditioning systems,and the gas suspension of rotor is an important development direction of centrifugal compressors in the future.But the bearing capacity of gas bearings,which bear the axial force on impeller,is smaller than that of traditional bearings.Therefore,the axial force of the shrouded impeller under full working conditions is simulated with the CFD numerical method.The numerical results are verified by the theoretical results.The influences of pressure ratio,flow rate,rotating speed,and seal diameter on the axial force are analyzed.The results show that when the compressor is operated in the steady working conditions,the axial force of impeller decreases with the increase of pressure ratio and the decrease of flow rate.But when the working point of the compressor is near the surge and the choked areas,the axial force of impeller increases.The axial force of impeller decreases with the increase of rotation speed.The error between the numerical calculation and theoretical calculation of the axial force under design conditions is only 4.4%,indicating that the CFD numerical method can be used as a reliable method for the calculation of the axial force of the centrifugal compressor impeller.
作者
衣可心
赵远扬
王春
Yi Kexin;Zhao Yuanyang;Wang Chun(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao,266061)
出处
《制冷与空调(四川)》
2021年第3期371-376,共6页
Refrigeration and Air Conditioning