氦低温透平膨胀机的设计和内部流动特性研究

Design and flow performance study of a helium cryogenic turbo-expander

为验证氦低温膨胀机叶片设计的有效性,利用了NUMECA和CFX软件对设计透平流道进行设计工况下的数值模拟计算及分析,其中分别对工作轮流道、喷嘴流道和整体流道进行计算分析,获得了较好的温度场、压力场、相对速度场分布和较高的等熵效率,结果表明了数值计算结果是可信的,叶型设计是合理的。

The main structural parameters of the blade for a high-speed radial-axial flow helium cryo- genic turbo-expander were obtained through a design method based on one-dimension steady flow. The non- developable ruled parabolic shaping method was used to design the leaf type. In order to verify the effective- ness of the design, the numerical simulation and detailed analysis were carried out based on the designed turbine with given working condition using NUMECA and CFX software, and working wheel passage, nozzle passage and overall passage were separately analyzed. At last the reasonable temperature field, pressure field,distribution of relative velocity and high isentropic efficiency were obtained. The results show that the numerical result is credible and the impeller design is desirable.