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

Qing Xu, Aqiang Lin, Yuhang Cai, Naseem Ahmad, Yu Duan and Chen Liu
Additional contact information
Qing Xu: School of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang 524088, China
Aqiang Lin: School of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang 524088, China
Yuhang Cai: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Naseem Ahmad: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Yu Duan: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Chen Liu: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China

Energies, 2020, vol. 13, issue 7, 1-15

Abstract: 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.

Keywords: steam turbine; multi-phase flow; wet steam; last stage blades; extraction pipeline (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/7/1560/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/7/1560/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:7:p:1560-:d:337998

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().