高负荷涡轮机流动特性及变工况性能数值研究  

Numerical Investigation on Flow Characteristics and Off-design Performance of Highly-loaded Turbine Engine

作　　者：边昕[1] 张睿刚 李涛[3] 姜良[1] 黄洪雁[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001 [2]华能集团西安热工研究院有限公司,西安710032 [3]上海理工大学能源与动力工程学院,上海200093

出　　处：《汽轮机技术》2015年第2期81-85,共5页Turbine Technology

基　　金：国防"973"基础项目(No.613188030103)

摘　　要：为了研究某高负荷涡轮机流动特点及变工况工作特性,采用商业软件对涡轮机整级进行了数值计算,研究了涡轮机内部流场的流动特点,分析了变工况时的效率及功率变化趋势。研究结果表明,喷嘴内流动达到超音速,并有斜激波产生,动叶流道内有激波产生,造成附面层分离,产生较大的损失。同时,由于局部进气的原因,动叶叶栅内气流参数分布很不均匀,不同叶片的气动力矩相差很大。非设计工况下,落压比和转速的变化会引起涡轮机效率的显著下降。In order to investigate the flow characteristics and off-design working performance and variation pattern of a highly-laoded steam turbine,CFX was used to conduct numerical simulation of the turbine. The inner flow field characteristics were studied; and the turbine efficiency and power variation tendency were analyzed. The numerical results show that,the flow in nozzle is supersonic and produces a shock wave. In rotor passage,shock wave and boundary separation loss exist. Also,for partial admission,the flow parameters in rotor passage is uneven. The blades＇ aerodynamic torques are different. Under off-design working condition,the variation in pressure ratio and rotation speed leads to notable decrease of turbine efficiency.

关 键 词：涡轮机 变工况 数值仿真 局部进气 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程]