Flow analysis in different geometries for optimization of exhaust manifold in a locomotive diesel engine

IF 6 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
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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.

优化机车柴油发动机排气歧管的不同几何形状流动分析
设计合理的排气歧管对发动机的效率和废气排放有积极影响。如果排气歧管的尺寸和几何结构设计不符合流体的压力波动,则会对气流的速度、温度、密度和压力产生负面影响。鉴于此以及机车柴油发动机的高生产成本,本研究对一台六缸机车发动机排气歧管中的压力和速度分布进行了数值研究。考虑到排气歧管的安装区域和发动机的其他部件,研究了柴油发动机的两种不同设计。通过计算流体动力学分析比较了排气歧管的压力和速度变化,并使用重型柴油发动机在不同功率值(225、450、675 和 900 HP)和 1500 转/分转速下的测试数据进行了分析,目的是找到最佳设计。由于气缸出口的直径无法改变,因此设计时要考虑到发动机现有的面积。结果发现,在排气口位于排气歧管中间的模型中,流量效率更高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ain Shams Engineering Journal
Ain Shams Engineering Journal Engineering-General Engineering
CiteScore
10.80
自引率
13.30%
发文量
441
审稿时长
49 weeks
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.
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