Thermal mixing and structure of the jet in swirling crossflow

IF 4.1 2区 工程技术 Q1 MECHANICS
Zhengzhe Fang, Chi Zhang, Yushuai Liu, Tianheng Gao, Cunxi Liu, Xin Xue, Wei Gao, Gang Xu, Junqiang Zhu
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引用次数: 0

Abstract

The dilution zone in modern aero-engine combustors is characterized by a strong swirling mainstream with weak transverse jets. This characteristic brings new challenges in homogenizing the temperature distribution at the combustor exit. Therefore, it is imperative to understand the temperature penetration and mixing process of the jet in swirling crossflow (JISCF). This investigation provides new insight in the temperature mixing process for a JISCF in nozzle exit diameter (D) at 7.4, 10.7, and 14 mm and jet to mainstream velocity ratio (VR) from 2.0 to 6.6. The temperature mixing process was measured in a specially designed optical assessable three-dome model gas turbine combustor by planar 1-methylnaphthalene (1-MN) tracer laser-induced fluorescence thermometry. A detailed quantitative measurement of temperature distribution is achieved through the spectral red shift in the fluorescence of 1-MN as the temperature increase. This diagnostic was employed to provide the first two-dimensional temperature distribution for the JISCF. The results showed that the swirling crossflows induce strong spanwise thermal advection, forming secondary low-temperature regions downstream. Generally, the flow structure and mixing process are governed by the interaction of jet and swirling flow. The jet flow parameters, including velocity ratio and diameter, changed the flow structures by changing the interaction between jet and swirling flow. Statistical results and proper orthogonal decomposition (POD) analyses showed a strong anisotropic mixing process in the downstream of the jet.
漩涡横流中的热混合和射流结构
现代航空发动机燃烧器稀释区的特点是主流漩涡强,横向喷流弱。这一特点给燃烧器出口温度分布的均匀化带来了新的挑战。因此,了解漩涡横流中射流(JISCF)的温度渗透和混合过程势在必行。本研究为喷嘴出口直径(D)为 7.4、10.7 和 14 毫米以及射流与主流速度比(VR)为 2.0 至 6.6 的 JISCF 的温度混合过程提供了新的见解。通过平面 1-甲基萘(1-MN)示踪激光诱导荧光测温仪,在专门设计的光学可评估三圆顶模型燃气轮机燃烧器中测量了温度混合过程。随着温度的升高,1-MN 的荧光光谱会发生红移,从而对温度分布进行详细的定量测量。采用这种诊断方法首次为监委会联合委员会论坛提供了二维温度分布。结果表明,漩涡交叉流引起了强烈的跨向热平流,在下游形成了次级低温区。一般来说,流动结构和混合过程受射流和漩涡流相互作用的支配。射流参数,包括速度比和直径,通过改变射流和漩涡流之间的相互作用而改变流动结构。统计结果和正交分解(POD)分析表明,射流下游存在强烈的各向异性混合过程。
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来源期刊
Physics of Fluids
Physics of Fluids 物理-力学
CiteScore
6.50
自引率
41.30%
发文量
2063
审稿时长
2.6 months
期刊介绍: Physics of Fluids (PoF) is a preeminent journal devoted to publishing original theoretical, computational, and experimental contributions to the understanding of the dynamics of gases, liquids, and complex or multiphase fluids. Topics published in PoF are diverse and reflect the most important subjects in fluid dynamics, including, but not limited to: -Acoustics -Aerospace and aeronautical flow -Astrophysical flow -Biofluid mechanics -Cavitation and cavitating flows -Combustion flows -Complex fluids -Compressible flow -Computational fluid dynamics -Contact lines -Continuum mechanics -Convection -Cryogenic flow -Droplets -Electrical and magnetic effects in fluid flow -Foam, bubble, and film mechanics -Flow control -Flow instability and transition -Flow orientation and anisotropy -Flows with other transport phenomena -Flows with complex boundary conditions -Flow visualization -Fluid mechanics -Fluid physical properties -Fluid–structure interactions -Free surface flows -Geophysical flow -Interfacial flow -Knudsen flow -Laminar flow -Liquid crystals -Mathematics of fluids -Micro- and nanofluid mechanics -Mixing -Molecular theory -Nanofluidics -Particulate, multiphase, and granular flow -Processing flows -Relativistic fluid mechanics -Rotating flows -Shock wave phenomena -Soft matter -Stratified flows -Supercritical fluids -Superfluidity -Thermodynamics of flow systems -Transonic flow -Turbulent flow -Viscous and non-Newtonian flow -Viscoelasticity -Vortex dynamics -Waves
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