一种新型滑片式膨胀机性能的CFD研究

CFD Research on the Performance of a New Type Sliding Vane Expander

提出了一种新型滑片式膨胀机,其气缸随转子转动能有效减小缸内磨损和摩擦,转子缩小能增大工作容积,增加导流叶片能改善流动状况。为探究转子结构对膨胀机性能的影响,选取RNG k-ε湍流模型,采用FLUENT软件并结合动态网格技术对不同转子尺寸的4种方案进行模拟计算,得出其内部流场特征,以及排气流量、温度、泄漏流量的变化规律。结果表明:最小间隙比由0.03增大至0.06,排气的连续性和稳定性增强,平均排气质量流量提高80.66%,平均排气温度降低11.21 K,平均泄漏质量流量降低2.13%,等熵效率提高5.08百分点。

A new type sliding vane expander was proposed,in which the air cylinder rotating with the rotor can effectively reduce the wear and friction in the cylinder,the working volume can be increased by reducing the rotor,and the flow condition can be improved by adding guide vanes.In order to explore the influence of rotor structure on the performance of expander,the RNG k-ε turbulence model was selected and four schemes with different rotor sizes were simulated by FLUENT software and dynamic grid technology,and the characteristics of internal flow field,as well as the change rules of exhaust flow,temperature and leakage flow were obtained.The results show that the minimum clearance ratio increases from 0.03 to 0.06,the continuity and stability of exhaust are enhanced,the average exhaust flow is increased by 80.66%,the average exhaust temperature is decreased by 11.21 K,the average leakage is decreased by 2.13%,and the isentropic efficiency is increased by 5.08 percentage points.