Computational Fluid Dynamics: Flow Analysis on The Effect of Different Jet Orifice Angle Multi Circular Jet for Fuel and Air Mixing

Q2 Mathematics
Ridzwan Kamaruddin, Syabillah Sulaiman, Amir Khalid, Mr. Arafat, Norrizam Jaat, Shaiful Fadzil Zainal Abidin, Norirda Mohamed, Mohd Fuad Yasak
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Abstract

The mixing of fuel and air plays a major role in the spray and flame behavior, hence affecting the combustion performance and emissions of the internal mixing air-assisted atomizers. Air-assisted atomizers are introduced to counter the low-pressure differential of a simplex nozzle, which reduces the atomization quality. The present study aims to determine the effects of Multi Circular Jet (MCJ) plates on the geometrical configurations of internal flows in mixing chamber and the internal flow of plate 3 using different properties of fuel. In this study, the realizable k-ε turbulence model, specifically designed for strongly swirling flows, is validated through numerical simulations. The turbulence model selected is a type of Reynolds averaged Navier-Stokes (RANS) model called the k-ε model. The MCJ plates provide the primary air entrance into the mixing chamber. Additionally, it acts as a turbulence generator and can be adjusted to alter the flow of fuel and air mixtures in a mixing chamber. The study compares several MCJ geometries in terms of pressure, speed, turbulent kinetic energy, and volume fraction and compares the performances of diesel and Crude Palm Oil (CPO) B30 biodiesel fuels. The findings imply that CPO B30 biodiesel has superior atomization and mixing due to its higher density and turbulent kinetic energy. CPO B30 biodiesel was compared to Diesel in terms of maximum pressure, average speed, turbulent kinetic energy per unit mass, and volume fraction. The results indicate that CPO B30 has lower pressure and higher velocity than Diesel, suggesting better fuel atomization and mixing. The higher density of CPO B30 leads to increased turbulent kinetic energy, improving fuel-air mixing inside the combustion chamber. The study demonstrates that the use of MCJ plates can enhance mixing in a mixing chamber. In addition, MCJ plates show the ability to control the spray and atomization. The findings of this study contribute to a better understanding of the relationships between geometry and fuel-air mixing, as well as the characteristics of the internal mixing air-assisted atomizer, which will lead to future burner system improvements.
计算流体动力学:不同喷射口角度对燃料和空气混合多圆形喷射器影响的流动分析
燃料和空气的混合在喷雾和火焰行为中起着重要作用,从而影响内部混合空气辅助雾化器的燃烧性能和排放。引入空气辅助雾化器是为了消除单喷嘴的低压差,因为低压差会降低雾化质量。本研究旨在确定多环形喷射板(MCJ)对混合室内部流动几何配置的影响,以及使用不同性质燃料时板 3 内部流动的影响。本研究通过数值模拟验证了专为强漩涡流设计的可实现 k-ε 湍流模型。所选的湍流模型是一种雷诺平均纳维-斯托克斯(RANS)模型,称为 k-ε 模型。MCJ 板是进入混合室的主要空气入口。此外,它还充当湍流发生器,可通过调节来改变混合室中燃料和空气混合物的流动。研究比较了压力、速度、湍流动能和体积分数方面的几种 MCJ 几何结构,并比较了柴油和粗棕榈油 (CPO) B30 生物柴油燃料的性能。研究结果表明,由于 CPO B30 生物柴油的密度和湍流动能更高,因此其雾化和混合效果更好。CPO B30 生物柴油与柴油在最大压力、平均速度、单位质量湍流动能和体积分数方面进行了比较。结果表明,与柴油相比,CPO B30 的压力更低,速度更高,表明燃料雾化和混合效果更好。CPO B30 的密度较高,导致湍流动能增加,从而改善了燃烧室内燃料与空气的混合。这项研究表明,使用 MCJ 板可以增强混合室中的混合效果。此外,MCJ 板还显示出控制喷雾和雾化的能力。这项研究的结果有助于更好地理解几何形状与燃料-空气混合之间的关系,以及内部混合空气辅助雾化器的特性,这将有助于未来燃烧器系统的改进。
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
CFD Letters
CFD Letters Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
3.40
自引率
0.00%
发文量
76
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