A numerical study of flow pattern in a deteriorated gas turbine under real operating condition

A numerical study of aerodynamics in a deteriorated gas turbine was carried out. In the present study, a hybrid method of CFD simulation and heat balance analysis were used to estimate entire performance of the gas turbine cycle and local flow characteristics in the turbine section. Using this analy...

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Autores principales:	Koichi YONEZAWA, Masahiro TAKAYASU, Kazuyasu SUGIYAMA, Katsuhiko SUGITA, Shuichi UMEZAWA, Shuichi OMORI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	gas turbine blade deterioration aerodynamics maintenance computational fluid dynamics heat balance analysis Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/c061a76bb1804179b80183084226941b
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spelling	oai:doaj.org-article:c061a76bb1804179b80183084226941b2021-11-29T05:59:26ZA numerical study of flow pattern in a deteriorated gas turbine under real operating condition2187-974510.1299/mej.20-00122https://doaj.org/article/c061a76bb1804179b80183084226941b2020-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_20-00122/_pdf/-char/enhttps://doaj.org/toc/2187-9745A numerical study of aerodynamics in a deteriorated gas turbine was carried out. In the present study, a hybrid method of CFD simulation and heat balance analysis were used to estimate entire performance of the gas turbine cycle and local flow characteristics in the turbine section. Using this analysis method, flows in a deteriorated gas turbine were simulated under an operating condition, which was designated using the same procedure with that used in a real power plant. In our previous study, the degradation of the gas turbine performance due to blades deterioration had been observed. In the present study, flow patterns were observed and mechanisms underlying the degradation of the gas turbine performance were discussed in detail. Influences of two kinds of deterioration on flow patterns were examined: the first was thinning of nozzle guide vanes in the first stage and the second was increase of rotor tip gap in the first stage. The results showed that the deterioration of nozzle guide vanes leaded to decrease of the Mach number through the nozzle, and this leaded to increase of the turbine isentropic efficiency due to decrease of the friction loss. The increase in the rotor tip gap affected a loss generation of the following stage. Changes of flow patterns and its effects were discussed varying operating points of a gas turbine.Koichi YONEZAWAMasahiro TAKAYASUKazuyasu SUGIYAMAKatsuhiko SUGITAShuichi UMEZAWAShuichi OMORIThe Japan Society of Mechanical Engineersarticlegas turbineblade deteriorationaerodynamicsmaintenancecomputational fluid dynamicsheat balance analysisMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 20-00122-20-00122 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	gas turbine blade deterioration aerodynamics maintenance computational fluid dynamics heat balance analysis Mechanical engineering and machinery TJ1-1570
spellingShingle	gas turbine blade deterioration aerodynamics maintenance computational fluid dynamics heat balance analysis Mechanical engineering and machinery TJ1-1570 Koichi YONEZAWA Masahiro TAKAYASU Kazuyasu SUGIYAMA Katsuhiko SUGITA Shuichi UMEZAWA Shuichi OMORI A numerical study of flow pattern in a deteriorated gas turbine under real operating condition
description	A numerical study of aerodynamics in a deteriorated gas turbine was carried out. In the present study, a hybrid method of CFD simulation and heat balance analysis were used to estimate entire performance of the gas turbine cycle and local flow characteristics in the turbine section. Using this analysis method, flows in a deteriorated gas turbine were simulated under an operating condition, which was designated using the same procedure with that used in a real power plant. In our previous study, the degradation of the gas turbine performance due to blades deterioration had been observed. In the present study, flow patterns were observed and mechanisms underlying the degradation of the gas turbine performance were discussed in detail. Influences of two kinds of deterioration on flow patterns were examined: the first was thinning of nozzle guide vanes in the first stage and the second was increase of rotor tip gap in the first stage. The results showed that the deterioration of nozzle guide vanes leaded to decrease of the Mach number through the nozzle, and this leaded to increase of the turbine isentropic efficiency due to decrease of the friction loss. The increase in the rotor tip gap affected a loss generation of the following stage. Changes of flow patterns and its effects were discussed varying operating points of a gas turbine.
format	article
author	Koichi YONEZAWA Masahiro TAKAYASU Kazuyasu SUGIYAMA Katsuhiko SUGITA Shuichi UMEZAWA Shuichi OMORI
author_facet	Koichi YONEZAWA Masahiro TAKAYASU Kazuyasu SUGIYAMA Katsuhiko SUGITA Shuichi UMEZAWA Shuichi OMORI
author_sort	Koichi YONEZAWA
title	A numerical study of flow pattern in a deteriorated gas turbine under real operating condition
title_short	A numerical study of flow pattern in a deteriorated gas turbine under real operating condition
title_full	A numerical study of flow pattern in a deteriorated gas turbine under real operating condition
title_fullStr	A numerical study of flow pattern in a deteriorated gas turbine under real operating condition
title_full_unstemmed	A numerical study of flow pattern in a deteriorated gas turbine under real operating condition
title_sort	numerical study of flow pattern in a deteriorated gas turbine under real operating condition
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/c061a76bb1804179b80183084226941b
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A numerical study of flow pattern in a deteriorated gas turbine under real operating condition

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