不同空腔导叶结构的稀燃困涡燃烧室燃烧流动特性评价

IF 0.6 4区 工程技术 Q4 MECHANICS
S. Subramanian, K. M. Parammasivam, A. Shankar
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引用次数: 0

摘要

本研究的重点是分析空腔导叶结构的变化对困涡式燃烧器性能的影响。对装有空腔导叶的陷涡燃烧器进行了稳定、二维反应流和非反应流数值模拟。引入了三种情况,即 a) 带有矩形导叶和方形边缘的燃烧器;b) 带有圆形边缘的矩形导叶;c) 带有圆形边缘的流线型导叶。在气流速度为 20、30 和 40 米/秒时,考虑了非反应流情况。在反应流情况下,过量空气为 20% 时的等效比保持为 0.8。进入空腔的质量夹带和整个燃烧器的压力损失用于评估空腔导叶的效果。燃烧器边缘呈圆形的矩形导叶在质量夹带和涡流结构方面表现良好。主流风速为 40 米/秒时,直接质量夹带峰值为 3.8 千克/秒。带圆角的矩形导叶在所有速度下都具有优异的流动和燃烧特性。据观察,空腔导叶结构的优化在决定进入空腔的总流量以及空腔内形成的涡流数量和强度方面起着重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluation of Combustion Flow Characteristics of a Lean-Burn Trapped Vortex Combustor with Various Cavity Guide Vane Structures

Evaluation of Combustion Flow Characteristics of a Lean-Burn Trapped Vortex Combustor with Various Cavity Guide Vane Structures

The present study focuses on analyzing the effects of variations in the cavity guide vane structure on the performance of a trapped vortex combustor. Steady, 2D reactive and non-reactive flow numerical simulations were carried out for a trapped vortex combustor fitted with a cavity guide vane. Three cases were introduced, namely, a) the combustor with rectangular guide vane and squared edges, b) the rectangular guide vane with rounded edges, and c) streamlined guide vane with rounded edges. Non-reactive flow cases were considered at the air velocities of 20, 30, and 40 m/s. In reactive- flow cases, the equivalence ratio is maintained with 20% excess air as 0.8. Mass entrainment into the cavity and pressure loss across the combustor are used to evaluate the effectiveness of cavity guide vane. The rectangular guide vane with rounded edges of combustor performs well in terms of the mass entrainment and the vortex structure. A peak direct mass entrainment of 3.8 kg/s was obtained for the mainstream air velocity of 40 m/s. The rectangular guide vane with rounded edges possess the superior flow and combustion characteristics at all velocities. It has been observed that the cavity guide vane structure optimization plays an important role in determining the total flow into the cavity and the number and strength of vortices formed inside the cavity.

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来源期刊
Fluid Dynamics
Fluid Dynamics MECHANICS-PHYSICS, FLUIDS & PLASMAS
CiteScore
1.30
自引率
22.20%
发文量
61
审稿时长
6-12 weeks
期刊介绍: Fluid Dynamics is an international peer reviewed journal that publishes theoretical, computational, and experimental research on aeromechanics, hydrodynamics, plasma dynamics, underground hydrodynamics, and biomechanics of continuous media. Special attention is given to new trends developing at the leading edge of science, such as theory and application of multi-phase flows, chemically reactive flows, liquid and gas flows in electromagnetic fields, new hydrodynamical methods of increasing oil output, new approaches to the description of turbulent flows, etc.
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