Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity

The cooling effect of turbine vane is of great importance for ensuring thermal protection and economic operation of gas turbines. This study aims to reveal the influence mechanism and performance of impingement cooling and heat transfer within a turbine guide vane cavity. Then, a turbine guide vane...

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Autores principales:	Lixi Zhang, Gaopan Cao, Kai Feng, Yi Jia, Zhengyang Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	turbine vane cavity impingement cooling pin fin multi-hole heat transfer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8e0e2718a391450b9be84de6718680b6
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id	oai:doaj.org-article:8e0e2718a391450b9be84de6718680b6
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spelling	oai:doaj.org-article:8e0e2718a391450b9be84de6718680b62021-11-11T15:01:11ZImprovement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity10.3390/app112199242076-3417https://doaj.org/article/8e0e2718a391450b9be84de6718680b62021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9924https://doaj.org/toc/2076-3417The cooling effect of turbine vane is of great importance for ensuring thermal protection and economic operation of gas turbines. This study aims to reveal the influence mechanism and performance of impingement cooling and heat transfer within a turbine guide vane cavity. Then, a turbine guide vane cavity with a complex pin fins structure is numerically investigated at a multi-hole impingement by comparison with experiment verification. The results show that the larger the Reynolds number is, the larger the average Nusselt number is on the upper and lower surfaces of the cavity. The average Nusselt number increased on the upper and lower surfaces as the impingement hole diameter increased. Comparing 1 impingement hole with 16 ones, the average Nusselt number of the lower surface of the latter is 553.9% larger than that of the former. Furthermore, the average Nusselt number of the lower surface for pin fin height of 3 mm is only improved by 11.2% for pin fin height of 24 mm. The heat transfer effect near the impingement holes is better than that far away from the impingement holes. In particular, it is recommended to have 14 impingement holes with a hole diameter of 7.2 mm, as well as circular pin fins with a height of 3 mm and spacing of 25.8 mm. In addition, the entropy generation distribution in impingement cooling is analyzed. This study can provide a reference to enhance the turbine vane cooling performance by optimization design.Lixi ZhangGaopan CaoKai FengYi JiaZhengyang ZhangMDPI AGarticleturbine vane cavityimpingement coolingpin finmulti-holeheat transferTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9924, p 9924 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	turbine vane cavity impingement cooling pin fin multi-hole heat transfer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	turbine vane cavity impingement cooling pin fin multi-hole heat transfer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Lixi Zhang Gaopan Cao Kai Feng Yi Jia Zhengyang Zhang Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity
description	The cooling effect of turbine vane is of great importance for ensuring thermal protection and economic operation of gas turbines. This study aims to reveal the influence mechanism and performance of impingement cooling and heat transfer within a turbine guide vane cavity. Then, a turbine guide vane cavity with a complex pin fins structure is numerically investigated at a multi-hole impingement by comparison with experiment verification. The results show that the larger the Reynolds number is, the larger the average Nusselt number is on the upper and lower surfaces of the cavity. The average Nusselt number increased on the upper and lower surfaces as the impingement hole diameter increased. Comparing 1 impingement hole with 16 ones, the average Nusselt number of the lower surface of the latter is 553.9% larger than that of the former. Furthermore, the average Nusselt number of the lower surface for pin fin height of 3 mm is only improved by 11.2% for pin fin height of 24 mm. The heat transfer effect near the impingement holes is better than that far away from the impingement holes. In particular, it is recommended to have 14 impingement holes with a hole diameter of 7.2 mm, as well as circular pin fins with a height of 3 mm and spacing of 25.8 mm. In addition, the entropy generation distribution in impingement cooling is analyzed. This study can provide a reference to enhance the turbine vane cooling performance by optimization design.
format	article
author	Lixi Zhang Gaopan Cao Kai Feng Yi Jia Zhengyang Zhang
author_facet	Lixi Zhang Gaopan Cao Kai Feng Yi Jia Zhengyang Zhang
author_sort	Lixi Zhang
title	Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity
title_short	Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity
title_full	Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity
title_fullStr	Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity
title_full_unstemmed	Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity
title_sort	improvement of multi-hole airflow impingement on flow and heat transfer characteristics inside a turbine vane cavity
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8e0e2718a391450b9be84de6718680b6
work_keys_str_mv	AT lixizhang improvementofmultiholeairflowimpingementonflowandheattransfercharacteristicsinsideaturbinevanecavity AT gaopancao improvementofmultiholeairflowimpingementonflowandheattransfercharacteristicsinsideaturbinevanecavity AT kaifeng improvementofmultiholeairflowimpingementonflowandheattransfercharacteristicsinsideaturbinevanecavity AT yijia improvementofmultiholeairflowimpingementonflowandheattransfercharacteristicsinsideaturbinevanecavity AT zhengyangzhang improvementofmultiholeairflowimpingementonflowandheattransfercharacteristicsinsideaturbinevanecavity
_version_	1718437617851170816

Improvement of Multi-Hole Airflow Impingement on Flow and Heat Transfer Characteristics Inside a Turbine Vane Cavity

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