带导叶气缸随转滑片式膨胀机性能的数值模拟  

Numerical simulation on performance of sliding vane expander with synchronous rotating cylinder and guiding vanes

作　　者：蒋芸慧 陈亚平[1] 吴嘉峰[1] 顾花朵 Jiang Yunhui;Chen Yaping;Wu Jiafeng;Gu Huaduo(School of Energy and Environment, Southeast University, Nanjing 210096, China)

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2021年第5期889-895,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51776035,51976033).

摘　　要：为向中小型发电场合提供适宜动力部件,提出了一种新型带导叶的气缸随转滑片式膨胀机,其设有随转子转动的气缸以减小磨损摩擦,缩小转子以增大腔室容积,且在进、排气流道中增设用以改善流动的导叶结构.结合动网格技术,选取RNG k-ε湍流模型,采用FLUENT软件对滑片数目分别为6和12的膨胀机方案进行动态模拟,并分析其内部流场特征及排气质量流量、温度和泄漏流量的变化以优化各方案性能.结果表明:增加滑片数目有利于增强排气连续性,但膨胀机性能及效率略有下降;若将排气终边延后25°,则能减弱余隙容积的影响,使膨胀机性能提高,其平均排气质量流量增大2.42%,平均排气温度降低4.56 K,等熵效率提高2.08%,平均泄漏流量减少5.71%.To provide suitable power components for small and medium-sized power generation applications,a novel type of sliding vane expander is proposed with synchronous rotating cylinder and guiding vanes.The expander is equipped with a synchronous cylinder rotating with a rotor to reduce the wear and friction,and the rotor is reduced to increase the volume of chambers,and the guiding vanes in both intake and exhaust passages are set to improve flow.Combined with the dynamic grid technology,the RNG k-εturbulence model is selected,and the dynamic simulation is carried out by FLUENT software on the expander schemes with the number of slides of 6 and 12,respectively.The characteristics of the internal flow field and the changes of the exhaust mass flow rate,the temperature,and the leakage flow are analyzed to optimize the performance of each scheme.The results show that increasing the number of sliding vanes is beneficial to enhance the continuity of exhausting,but the performance and the efficiency of the expander are slightly reduced.If the exhaust end edge is delayed by 25°,the effect of the clearance volume can be weakened and the performance of the expander can be improved.The average exhaust mass flow rate increases by 2.42%,the average exhaust temperature decreases by 4.56 K,the isentropic efficiency increases by 2.08%,and the average leakage flow rate decreases by 5.71%.

关 键 词：气缸随转 滑片式膨胀机 导叶 数值模拟 

分 类 号：TK14[动力工程及工程热物理—热能工程]