新型高负荷氦气压气机的三维级性能研究

按照传统空气设计规律设计的氦气压气机存在级数较多的问题.为了提高氦气压气机的级压比以减少级数,采用适合于氦气压气机的新型基元级速度三角形理论进行高负荷氦气压气机的三维级气动设计,应用CFD软件对其三维级流场进行数值模拟,同时进行了与常规设计准则的对比研究.研究结果表明,高负荷基元级沿径积叠成三维级是可行的；相同条件下,高负荷设计三维级方案设计点的级压比达到1.138 8,级压比是常规设计的2倍多,且效率还能维持高达89.86％的较高水平.

A performance study on the three-dimensional stage of a new high-loaded helium compressor

According to the design rules of conventional air compressors,the number of stages necessary for the helium compressor is excessive.In order to increase the pressure ratio and thereby decrease the number of stages,an aerodynamic design for the three-dimensional stage of a high-loaded helium compressor was investigated by adopting the theory of new elementary stage velocity triangle.The three-dimensional stage flow field was numerically simulated with the computational fluid dynamics(CFD) software and a comparison study on its conventional design criteria was also presented.The results show that the high-loaded elementary stage radial stacking to three-dimensional stage is feasible.Under the same condition,the stage pressure ratio of a design point of the high-loaded three-dimensional stage design is 1.1388,which is more than twice that of the conventional design while still maintaining high efficiency(up to 89.86%).