A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation

The scavenging process of two-stroke engines plays a fundamental role in cylinder flow patterns and in the overall engine performance. In this work, 3D CFD simulations of the scavenging in a uniflow, two-stroke, compression ignition engine for general aviation, named GF56, have been performed by usi...

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Autores principales:	Maria Faruoli, Alessandro Coclite, Annarita Viggiano, Paolo Caso, Vinicio Magi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	two-stroke engines scavenging performance computational fluid dynamics engine design Technology T
Acceso en línea:	https://doaj.org/article/c49cb3497c9f419381c141cf08b4beb1
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id	oai:doaj.org-article:c49cb3497c9f419381c141cf08b4beb1
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spelling	oai:doaj.org-article:c49cb3497c9f419381c141cf08b4beb12021-11-11T16:04:39ZA Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation10.3390/en142173611996-1073https://doaj.org/article/c49cb3497c9f419381c141cf08b4beb12021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7361https://doaj.org/toc/1996-1073The scavenging process of two-stroke engines plays a fundamental role in cylinder flow patterns and in the overall engine performance. In this work, 3D CFD simulations of the scavenging in a uniflow, two-stroke, compression ignition engine for general aviation, named GF56, have been performed by using a 3D finite-volume FANS equations solver with <i>k</i>-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϵ</mi></semantics></math></inline-formula> closure. The GF56 engine consists of six cylinders, separated into two quasi-symmetric banks. Both the right and the left banks, together with the corresponding cylinders, are carefully analyzed. Charging and trapping efficiencies are computed as a function of the delivery ratio for different mass flow rates entering into the plenum, and the influence of the exhaust pressure and of the cylinder’s location in the bank are analyzed. The results show that the fresh air trapped during the scavenging process is quite similar for each cylinder of the right bank and it is about 92% of the in-cylinder mass. The cylinder’s location in the bank by itself slightly affects the scavenging performance, whereas the pressure profile at the outlet section has a major role. The design of the intake ports is fundamental for establishing the in-cylinder flow field and a new ports configuration is proposed to enhance the swirl ratio and, consequently, the scavenging performance with high delivery ratios.Maria FaruoliAlessandro CocliteAnnarita ViggianoPaolo CasoVinicio MagiMDPI AGarticletwo-stroke enginesscavenging performancecomputational fluid dynamicsengine designTechnologyTENEnergies, Vol 14, Iss 7361, p 7361 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	two-stroke engines scavenging performance computational fluid dynamics engine design Technology T
spellingShingle	two-stroke engines scavenging performance computational fluid dynamics engine design Technology T Maria Faruoli Alessandro Coclite Annarita Viggiano Paolo Caso Vinicio Magi A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation
description	The scavenging process of two-stroke engines plays a fundamental role in cylinder flow patterns and in the overall engine performance. In this work, 3D CFD simulations of the scavenging in a uniflow, two-stroke, compression ignition engine for general aviation, named GF56, have been performed by using a 3D finite-volume FANS equations solver with <i>k</i>-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϵ</mi></semantics></math></inline-formula> closure. The GF56 engine consists of six cylinders, separated into two quasi-symmetric banks. Both the right and the left banks, together with the corresponding cylinders, are carefully analyzed. Charging and trapping efficiencies are computed as a function of the delivery ratio for different mass flow rates entering into the plenum, and the influence of the exhaust pressure and of the cylinder’s location in the bank are analyzed. The results show that the fresh air trapped during the scavenging process is quite similar for each cylinder of the right bank and it is about 92% of the in-cylinder mass. The cylinder’s location in the bank by itself slightly affects the scavenging performance, whereas the pressure profile at the outlet section has a major role. The design of the intake ports is fundamental for establishing the in-cylinder flow field and a new ports configuration is proposed to enhance the swirl ratio and, consequently, the scavenging performance with high delivery ratios.
format	article
author	Maria Faruoli Alessandro Coclite Annarita Viggiano Paolo Caso Vinicio Magi
author_facet	Maria Faruoli Alessandro Coclite Annarita Viggiano Paolo Caso Vinicio Magi
author_sort	Maria Faruoli
title	A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation
title_short	A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation
title_full	A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation
title_fullStr	A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation
title_full_unstemmed	A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation
title_sort	comprehensive numerical analysis of the scavenging process in a uniflow two-stroke diesel engine for general aviation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c49cb3497c9f419381c141cf08b4beb1
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A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation

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