Numerical Characterization on the Influence of Flame Tube Geometry and Dump Gap in the Diffuser Performance at High Altitudes

IF 0.8 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-12-18 DOI:10.1007/s40010-023-00865-5
J. Bruce Ralphin Rose, L. Prawin
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Abstract

In the present work, numerical investigation is carried out on the effect of dump gap and geometry in the performance characteristics of dump combustor diffuser. Dump gap ratio is the essential quantity that determines the losses and the radius of curvature of the flow at the exit plane. The effect of altitude on the pressure and temperature distributions of the dump diffuser is studied numerically through the SST k − ω turbulence model. A novel dome geometric shape optimization strategy is proposed adjacent to the flame tube head, and the effective flow pattern and pressure distribution caused by the dome shapes are analyzed using ANSYS. The dump gap ratio about 1.1 with optimized dome shapes offers better results as compared to the others in terms of static pressure recovery. The temperature and pressure distributions of the optimized geometry are validated with the existing state-of-the-art parametric studies, and the results are presented. Relevance of the work: the proposed numerical investigation on the influence of dump gap and flame tube geometry in the diffuser performance has several technical merits toward the core functions of a gas turbine engine specifically at high altitudes. The state-of-the-art pressure recovery retention mechanism can also be deployed for various physical flow environments to attain the specific values for the primitive variables as discussed in this article.

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火焰管几何形状和倾卸间隙对高海拔地区扩散器性能影响的数值分析
本研究对倾卸间隙和几何形状对倾卸式燃烧器扩散器性能特征的影响进行了数值研究。倾卸间隙比是决定出口平面气流损失和曲率半径的基本量。通过 SST k - ω 湍流模型对高度对倾弃扩散器压力和温度分布的影响进行了数值研究。提出了一种邻近火焰管头部的新型穹顶几何形状优化策略,并使用 ANSYS 分析了穹顶形状引起的有效流型和压力分布。与其他优化的穹顶形状相比,倾卸间隙比约为 1.1 的穹顶形状在静压恢复方面具有更好的效果。优化几何形状的温度和压力分布与现有的最先进参数研究进行了验证,并给出了结果。工作的相关性:所提出的关于倾弃间隙和火焰管几何形状对扩散器性能影响的数值研究,对燃气涡轮发动机的核心功能(特别是在高海拔地区)具有多项技术优势。最先进的压力恢复保持机制也可用于各种物理流动环境,以达到本文所讨论的原始变量的特定值。
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2.60
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0.00%
发文量
37
审稿时长
>12 weeks
期刊介绍: To promote research in all the branches of Science & Technology; and disseminate the knowledge and advancements in Science & Technology
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