{"title":"Flow analysis in different geometries for optimization of exhaust manifold in a locomotive diesel engine","authors":"","doi":"10.1016/j.asej.2024.102974","DOIUrl":null,"url":null,"abstract":"<div><p>A well-designed exhaust manifold has a positive effect on the efficiency of an engine and exhaust emissions. If the dimensions and geometric structure of the exhaust manifold are not designed in accordance with the pressure fluctuations of the fluid, this will have a negative effect on the velocity, temperature, density and pressure of the flow. In view of this and the high production costs of locomotive diesel engines, the pressure and velocity distributions in the exhaust manifold of a six-cylinder locomotive engine are investigated numerically in this study. Two different designs for the diesel engine are studied, taking into consideration the area in which the exhaust manifold will be mounted and the other engine parts. The pressure and velocity variations of the exhaust manifolds are compared via a computational fluid dynamics analysis, and analyses are performed using test data from a heavy-duty diesel engine at different power values (225, 450, 675, and 900 HP) and 1500 rpm, with the aim of finding the optimal design. Since the diameters at the cylinder outlets cannot be changed, the designs are created to fit within the existing area of the engine area The exhaust outlet is located in the middle of the manifold in the first model examined here, and is positioned close to the right-hand side of the manifold in the second model (the existing configuration). It is found that the flow becomes more efficient in the model in which the outlet is in the middle of the exhaust manifold.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0000,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2090447924003496/pdfft?md5=6c3b8a0d66b3d4e1cc9badde5a87a254&pid=1-s2.0-S2090447924003496-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ain Shams Engineering Journal","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2090447924003496","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
A well-designed exhaust manifold has a positive effect on the efficiency of an engine and exhaust emissions. If the dimensions and geometric structure of the exhaust manifold are not designed in accordance with the pressure fluctuations of the fluid, this will have a negative effect on the velocity, temperature, density and pressure of the flow. In view of this and the high production costs of locomotive diesel engines, the pressure and velocity distributions in the exhaust manifold of a six-cylinder locomotive engine are investigated numerically in this study. Two different designs for the diesel engine are studied, taking into consideration the area in which the exhaust manifold will be mounted and the other engine parts. The pressure and velocity variations of the exhaust manifolds are compared via a computational fluid dynamics analysis, and analyses are performed using test data from a heavy-duty diesel engine at different power values (225, 450, 675, and 900 HP) and 1500 rpm, with the aim of finding the optimal design. Since the diameters at the cylinder outlets cannot be changed, the designs are created to fit within the existing area of the engine area The exhaust outlet is located in the middle of the manifold in the first model examined here, and is positioned close to the right-hand side of the manifold in the second model (the existing configuration). It is found that the flow becomes more efficient in the model in which the outlet is in the middle of the exhaust manifold.
期刊介绍:
in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance.
Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.