文献类型：期刊文献

英文题名：Numerical Analysis of Aerodynamic Characteristics of Exhaust Passage with Consideration of Wet Steam Effect in a Supercritical Steam Turbine

作者：Xu, Qing[1,2,3];Lin, Aqiang[1,4];Cai, Yuhang[4];Ahmad, Naseem[4];Duan, Yu[4];Liu, Chen[4]

机构：[1]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524088, Peoples R China;[2]Southern Marine Sci & Engn Guangdong Lab Zhanjian, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Shenzhen Inst, Shenzhen 518108, Peoples R China;[4]Harbin Engn Univ, Coll Power & Energy Engn, Harbin 150001, Peoples R China

年份：2020

卷号：13

期号：7

外文期刊名：ENERGIES

收录：SCI-EXPANDED(收录号：WOS:000537688400029)、、EI(收录号：20201508404509)、Scopus(收录号：2-s2.0-85082956885)、WOS

基金：This research was funded by the Science and Technology Planning Project of Shenzhen City, China, grant number JCYJ20170818111529172. This research was also supported by the Fund of Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), China, grant number ZJW-2019-01.

语种：英文

外文关键词：steam turbine; multi-phase flow; wet steam; last stage blades; extraction pipeline

外文摘要：To investigate the aerodynamic performance of exhaust passage under multi-phase flow, an actual case is conducted in the low-pressure double exhaust passages of 600 MW steam turbine. Then, the flow field is compared and analyzed with and without the built-in extraction pipelines based on the Eulerian Eulerian homogenous medium multiphase method. Results show that the upstream swirling flow and downstream mixed swirling flow are the main causes to induce the entropy-increase in the exhaust passage. Moreover, the flow loss and static-pressure recovery ability in the exhaust hood are greater than those in the condenser neck. Compared with the flow field without the steam extraction pipelines, the entropy-increase increases, the static pressure recovery coefficient decreases, and the spontaneous condensation rates of wet steam decrease in the downstream area of the pipelines. With the increase of steam turbine loads, an increment in entropy-increase in the exhaust passage is 0.98 J/(kg.K) lower than that without steam extraction pipelines. Moreover, the incrementing range of uniformity coefficient is increased from 14.5% to 40.9% at the condenser neck outlet. It can be concluded that the built-in exhaustion pipeline can improve the aerodynamic performance of exhaust passage and better reflect the real state of the flow field. These research results can serve as a reference for turbine passage design.