Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions

Gas turbines performance losses are mainly due to the deposition of dirt on the compressor blades that needs to be periodically removed. This is the reason motivating the presence of water washing systems (WWS) in most of the compressor gas turbines. Water washing is generally achieved by installing...

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Autores principales:	Agati Giuliano, Di Gruttola Francesca, Gabriele Serena, Simone Domenico, Venturini Paolo, Borello Domenico
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/494b5e72a2494878a825e2330983e764
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spelling	oai:doaj.org-article:494b5e72a2494878a825e2330983e7642021-11-08T15:18:54ZEvaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions2267-124210.1051/e3sconf/202131211008https://doaj.org/article/494b5e72a2494878a825e2330983e7642021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_11008.pdfhttps://doaj.org/toc/2267-1242Gas turbines performance losses are mainly due to the deposition of dirt on the compressor blades that needs to be periodically removed. This is the reason motivating the presence of water washing systems (WWS) in most of the compressor gas turbines. Water washing is generally achieved by installing a number of nozzles on the compressor casing and spraying water that clean the dirty surfaces of the compressor. The side effect of such a technique is the rising risk of erosion due to the impact of water droplets on the compressor blades which is even more pronounced when dealing with online water washing systems that is done while the unit is at normal load. The design of these systems must balance benefits and disadvantages associated to the process itself. The benefits can be measured in terms of water washing efficiency that is a quantity not uniquely defined. In previous works, the authors introduced some indices useful to evaluate the spatial cleaning coverage (the wet to the total surface) and the quantity of water mass actually impacting the dirty surfaces (the impacted to injected mass). On the other hand, water washing erosion is a complex phenomenon depending on several parameters, such as the mechanical properties of the blade material, the impact velocity and angle and the droplet diameter. For this reason, the WWS are strongly influenced by the adopted nozzles and by the injection conditions. The present paper aims at assessing water washing for six different injection conditions in the first stage of a real axial compressor. Two-phase CFD simulations are carried out with Ansys Fluent where a User Defined Function implemented by the authors is used to properly model water droplet erosion mechanism and to obtain all the quantities needed to evaluate the washing quality. Results confirm the strong influence of the injection conditions on the main features of the washing system. The study is part of an ongoing partnership between Baker Hughes and Sapienza University of Rome aiming at maximizing the washing of the compressor blades while maintaining the erosion under specific thresholds.Agati GiulianoDi Gruttola FrancescaGabriele SerenaSimone DomenicoVenturini PaoloBorello DomenicoEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 11008 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Agati Giuliano Di Gruttola Francesca Gabriele Serena Simone Domenico Venturini Paolo Borello Domenico Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions
description	Gas turbines performance losses are mainly due to the deposition of dirt on the compressor blades that needs to be periodically removed. This is the reason motivating the presence of water washing systems (WWS) in most of the compressor gas turbines. Water washing is generally achieved by installing a number of nozzles on the compressor casing and spraying water that clean the dirty surfaces of the compressor. The side effect of such a technique is the rising risk of erosion due to the impact of water droplets on the compressor blades which is even more pronounced when dealing with online water washing systems that is done while the unit is at normal load. The design of these systems must balance benefits and disadvantages associated to the process itself. The benefits can be measured in terms of water washing efficiency that is a quantity not uniquely defined. In previous works, the authors introduced some indices useful to evaluate the spatial cleaning coverage (the wet to the total surface) and the quantity of water mass actually impacting the dirty surfaces (the impacted to injected mass). On the other hand, water washing erosion is a complex phenomenon depending on several parameters, such as the mechanical properties of the blade material, the impact velocity and angle and the droplet diameter. For this reason, the WWS are strongly influenced by the adopted nozzles and by the injection conditions. The present paper aims at assessing water washing for six different injection conditions in the first stage of a real axial compressor. Two-phase CFD simulations are carried out with Ansys Fluent where a User Defined Function implemented by the authors is used to properly model water droplet erosion mechanism and to obtain all the quantities needed to evaluate the washing quality. Results confirm the strong influence of the injection conditions on the main features of the washing system. The study is part of an ongoing partnership between Baker Hughes and Sapienza University of Rome aiming at maximizing the washing of the compressor blades while maintaining the erosion under specific thresholds.
format	article
author	Agati Giuliano Di Gruttola Francesca Gabriele Serena Simone Domenico Venturini Paolo Borello Domenico
author_facet	Agati Giuliano Di Gruttola Francesca Gabriele Serena Simone Domenico Venturini Paolo Borello Domenico
author_sort	Agati Giuliano
title	Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions
title_short	Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions
title_full	Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions
title_fullStr	Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions
title_full_unstemmed	Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions
title_sort	evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/494b5e72a2494878a825e2330983e764
work_keys_str_mv	AT agatigiuliano evaluationofwaterwashingefficiencyanderosionriskinanaxialcompressorfordifferentwaterinjectionconditions AT digruttolafrancesca evaluationofwaterwashingefficiencyanderosionriskinanaxialcompressorfordifferentwaterinjectionconditions AT gabrieleserena evaluationofwaterwashingefficiencyanderosionriskinanaxialcompressorfordifferentwaterinjectionconditions AT simonedomenico evaluationofwaterwashingefficiencyanderosionriskinanaxialcompressorfordifferentwaterinjectionconditions AT venturinipaolo evaluationofwaterwashingefficiencyanderosionriskinanaxialcompressorfordifferentwaterinjectionconditions AT borellodomenico evaluationofwaterwashingefficiencyanderosionriskinanaxialcompressorfordifferentwaterinjectionconditions
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Evaluation of water washing efficiency and erosion risk in an axial compressor for different water injection conditions

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