Swirler Design Parameter Impact On Lean Blowout, Pressure Loss, and Flame Liftoff

Kevin J. DeMarco, M. Polanka, Brian T. Bohan
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Abstract

Swirl stabilized combustion is a common technique used in gas turbine engine combustors and is accomplished by introducing swirl into the inlet flow, which enhances mixing and stabilizes the combustion event. Coaxial swirlers introduce the fuel and air axially through concentric inlets and use vanes to impart a tangential component to either the fuel, air, or both flows. The present study conducted a parametric analysis of coaxial swirler design by manufacturing an array of 14 coaxial swirlers scaled for use in low flow, small engine operations which incorporated the same base design but varied the swirl number, Sn, by changing the vane angle between 0° and 63°, vane count between four and ten, and vane shape between traditional and helical. Each design was experimentally evaluated using air and propane at different flow conditions to correlate swirler design with lean blowout limits, pressure loss, and flame liftoff. Lean blowout was primarily influenced by swirl number, while vane count and shape had significant impact at Sn = 0.8 but little impact at Sn = 1.5. Pressure loss was unchanged below a Sn of 0.6, and unlike lean blowout, Sn had little impact at 0.8 but significant impact at 1.5. Finally, flame liftoff was mainly driven by swirl number, with vane count and shape the next significant design parameters.
涡流器设计参数对贫油喷出、压力损失和火焰升空的影响
漩涡稳定燃烧是燃气涡轮发动机燃烧器中常用的一种技术,通过在进气流中引入漩涡来加强混合并稳定燃烧。同轴漩涡器通过同心进气口轴向引入燃料和空气,并使用叶片为燃料流、空气流或两股气流传递切向分量。本研究对同轴漩涡器的设计进行了参数分析,制造了 14 个同轴漩涡器阵列,用于小流量、小型发动机的运行,这些漩涡器采用了相同的基本设计,但通过改变叶片角度(0° 至 63°)、叶片数量(4 至 10)以及叶片形状(传统型和螺旋型)来改变漩涡数(Sn)。在不同的流动条件下,使用空气和丙烷对每种设计进行了实验评估,以确定漩涡设计与贫气喷出极限、压力损失和火焰升腾之间的关系。贫气喷出主要受漩涡数的影响,而叶片数和形状在 Sn = 0.8 时影响很大,但在 Sn = 1.5 时影响很小。压力损失在 Sn = 0.6 以下保持不变,与贫油喷出不同的是,Sn 在 0.8 时影响很小,但在 1.5 时影响很大。最后,火焰升腾主要受漩涡数的影响,叶片数量和形状是下一个重要的设计参数。
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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