The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions

Velocity factors are important parameters to determine the efficiency of turbine stages, and it is necessary to systematically study the effect of decline in velocity factors on stages efficiency under off-design conditions. In this paper the definition of the sensitivity of the velocity factors is...

Full description

Bibliographic Details
Main Authors:	Jiang Junxu, Xu Jianqun, Zhou Lili, Xing Tianyang, Wang Hanyu
Format:	Article
Language:	English
Published:	EDP Sciences 2021-01-01
Series:	E3S Web of Conferences
Online Access:	https://www.e3s-conferences.org/articles/e3sconf/pdf/2021/33/e3sconf_aesee2021_03043.pdf

id	doaj-22784611ee7f46549dcf16419c0fbbe9
record_format	Article
spelling	doaj-22784611ee7f46549dcf16419c0fbbe92021-05-28T12:42:12ZengEDP SciencesE3S Web of Conferences2267-12422021-01-012570304310.1051/e3sconf/202125703043e3sconf_aesee2021_03043The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design ConditionsJiang Junxu0Xu Jianqun1Zhou Lili2Xing Tianyang3Wang Hanyu4Southeast University, Department of Energy and EnvironmentSoutheast University, Department of Energy and EnvironmentSoutheast University, Department of Energy and EnvironmentSoutheast University, Department of Energy and EnvironmentSoutheast University, Department of Energy and EnvironmentVelocity factors are important parameters to determine the efficiency of turbine stages, and it is necessary to systematically study the effect of decline in velocity factors on stages efficiency under off-design conditions. In this paper the definition of the sensitivity of the velocity factors is proposed and effect of each parameter on the sensitivity is analysed. A simplified off-design model was also established to study the change of sensitivity of a governing-stage and pressure stage under the varying mass flow conditions. The results show that for the calculated turbine, the nozzle sensitivity of the governing stage is always greater than the blade for off-design conditions, and the efficiency of the nozzle in the governing stage should be emphasized. While the sensitivity of the pressure stage is related to the flow rate, it is more meaningful to improve the blade velocity factors in large mass flow conditions and it is reverse for low mass flow conditions. These findings will be meaningful in the optimization of turbine operation and designhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/33/e3sconf_aesee2021_03043.pdf
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Jiang Junxu Xu Jianqun Zhou Lili Xing Tianyang Wang Hanyu
spellingShingle	Jiang Junxu Xu Jianqun Zhou Lili Xing Tianyang Wang Hanyu The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions E3S Web of Conferences
author_facet	Jiang Junxu Xu Jianqun Zhou Lili Xing Tianyang Wang Hanyu
author_sort	Jiang Junxu
title	The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions
title_short	The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions
title_full	The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions
title_fullStr	The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions
title_full_unstemmed	The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions
title_sort	research of velocity factors sensitivity in turbine stages under off-design conditions
publisher	EDP Sciences
series	E3S Web of Conferences
issn	2267-1242
publishDate	2021-01-01
description	Velocity factors are important parameters to determine the efficiency of turbine stages, and it is necessary to systematically study the effect of decline in velocity factors on stages efficiency under off-design conditions. In this paper the definition of the sensitivity of the velocity factors is proposed and effect of each parameter on the sensitivity is analysed. A simplified off-design model was also established to study the change of sensitivity of a governing-stage and pressure stage under the varying mass flow conditions. The results show that for the calculated turbine, the nozzle sensitivity of the governing stage is always greater than the blade for off-design conditions, and the efficiency of the nozzle in the governing stage should be emphasized. While the sensitivity of the pressure stage is related to the flow rate, it is more meaningful to improve the blade velocity factors in large mass flow conditions and it is reverse for low mass flow conditions. These findings will be meaningful in the optimization of turbine operation and design
url	https://www.e3s-conferences.org/articles/e3sconf/pdf/2021/33/e3sconf_aesee2021_03043.pdf
work_keys_str_mv	AT jiangjunxu theresearchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT xujianqun theresearchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT zhoulili theresearchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT xingtianyang theresearchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT wanghanyu theresearchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT jiangjunxu researchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT xujianqun researchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT zhoulili researchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT xingtianyang researchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions AT wanghanyu researchofvelocityfactorssensitivityinturbinestagesunderoffdesignconditions
_version_	1721423762961727488

The Research of Velocity Factors Sensitivity in Turbine Stages under Off-design Conditions

Similar Items