叶轮入口叶片角对向心透平膨胀机流场和性能的影响  

Effect of impeller inlet blade angle on the flow field and performance of centrifugal turbine expanders

作　　者：王志文 刘正杨 宋永兴 朱相源 WANG Zhi-wen;LIU Zheng-yang;SONG Yong-xing;ZHU Xiang-yuan

机构地区：[1]山东建筑大学热能工程学院,山东济南250101

出　　处：《节能》2024年第9期54-58,共5页Energy Conservation

基　　金：压缩机技术国家重点实验室(压缩机技术安徽省实验室)开放基金项目(项目编号:SKL-YSJ202108);山东省自然科学基金(项目编号:ZR2021QE157)。

摘　　要：向心透平膨胀机是压缩空气储能系统释能阶段的关键部件,叶轮入口叶片角度对膨胀机流动特性具有较大影响。根据设计工况选择合适的叶片角,可以改善流场的分布情况,减小能量损失,提高透平膨胀机的性能。通过数值模拟方法,对不同入口叶片角的透平膨胀机进行研究。结果显示,入口叶片角主要对叶轮与导叶交汇处流场、叶轮喉部和出口流场有影响。入口叶片角偏小时,叶轮入口喉部能量损失较大,涡流明显,膨胀机透平效率较低。叶片角为100°时,叶轮内流场没有涡流,动叶叶片压力分布更均匀,流场分布相对更好,透平效率为80.75%,输出功率为142.77 kW,透平膨胀机整体性能较好。The centrifugal turbine expander is a key component in the energy release phase of compressed air energy storage systems.The inlet blade angle of the impeller has a significant impact on the flow characteristics of the expander.Choosing the appropriate blade angle according to the design conditions can improve the distribution of the flow field,reduce energy loss,and enhance the performance of the turbine expander.A numerical simulation method was used to study the turbine expanders with different inlet blade angles.The results show that the inlet blade angle mainly affects the flow field at the junction of the impeller and guide vane,the throat of the impeller,and the outlet flow field.When the inlet blade angle is small,the energy loss at the throat of the impeller inlet is greater,the vortex is more obvious,and the turbine efficiency of the expander is lower.When the blade angle is 100°,there is no vortex in the impeller flow field,the pressure distribution on the moving blade is more uniform,the flow field distribution is relatively better,the turbine efficiency is 80.75%,the output power is 142.77 kW,and the overall performance of the turbine expander is better.

关 键 词：透平膨胀机 入口叶片角 数值模拟 整体性能 

分 类 号：TK02[动力工程及工程热物理]