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首页> 外文期刊>Journal of Heat Transfer >Computational Fluid Dynamics Analysis of Aerodynamics and Impingement Heat Transfer From Hexagonal Arrays of Multiple Dual-Swirling Impinging Flame Jets
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Computational Fluid Dynamics Analysis of Aerodynamics and Impingement Heat Transfer From Hexagonal Arrays of Multiple Dual-Swirling Impinging Flame Jets

机译：多重旋流撞击火焰喷射的六角形阵列空气动力学和冲击热传递的计算流体动力学分析

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摘要

Radiative furnaces pose significant thermal inertia and single impinging flames have been observed to cause occurrence of hotspots on the target surface. Multiple burners arranged in suitable array configuration represent one of the plausible solutions for more uniform heat transfer. In this study, computational fluid dynamics (CFD) simulations have been carried out for multiple swirling impinging flames arranged in a hexagonal array configuration. The turbulence chemistry interactions in the flame field are solved numerically using renormalization group (RNG) based k-e/eddy dissipation model (EDM) framework. Comparison of co-and-counter-swirling configurations has been studied for interactions and spent gas release mechanism. Multiple swirling impinging flames undergo strong interactions resulting in distortions of recirculation zones (RCZ) for all the surrounding except central flame. Co-swirling flames result in development of higher turbulence in the interaction regions as compared to counter-swirl case. Results indicate that some flames in counter-swirl case are underutilized due to the fluid dynamics developed in the system and co-swirling hexagonal array configuration is a better arrangement for effective heating of target surface. Effect of inter jet spacing (S/D_h, = 5, 7, and 9) and separation distance (H/D_h =3, 5, 7, and 9) studied for co-swirl case revealed that peak heat fluxes decreased with increasing interjet spacing and separation distance. Central flame represented a region of low heat flux and this region has been noticed to expand in size for increasing interjet spacings. Suppression of central flame has been observed to be maximum for minimum separation distance.
机译：辐射炉造成显着的热惯性，并且已经观察到单一撞击火焰以导致目标表面上的热点发生。以合适的阵列配置排列的多个燃烧器代表了一种可粘合的溶液，可用于更均匀的传热。在本研究中，已经对以六边形阵列配置布置的多个旋转撞击火焰进行了计算流体动力学（CFD）模拟。火焰场中的湍流化学相互作用在数值上使用基于重整化组（RNG）的K-E /涡流耗散模型（EDM）框架来解决。研究了相互作用和废气释放机制的共旋旋流配置的比较。多个旋转的撞击火焰经历强烈的相互作用，导致除中央火焰外的所有周围的再循环区域（RCZ）的扭曲。与反旋流案例相比，共旋转的火焰导致相互作用区域的湍流更高的湍流。结果表明，由于系统中开发的流体动力学，并且共旋六角形阵列配置是一种更好的装置，用于有效加热靶表面的流体动力学，其一些火焰未充分利用。用于共旋壳的帧间射流间距（S / D_H，= 5,7和9）和分离距离（H / D_H = 3,5,7和9）的效果显示，随着跨动力的增加，峰热通量降低间距和分离距离。中央火焰代表了低热量通量的区域，并且已经注意到该区域的尺寸扩展以增加帧间间距。已经观察到抑制中央火焰的最大分离距离。

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  • 来源
    《Journal of Heat Transfer》 |2020年第8期|081301.1-081301.15|共15页
  • 作者

    Parampreet Singh; Ratna Kishore Velamati; Subhash Chander;

  • 作者单位

    Department of Mechanical Engineering Dr. B.R. Ambedkar National Institute of Technology Jalandhar Punjab 144011 India;

    Department of Mechanical Engineering Amrita Vishwa Vidyapeetham Coimbatore 641112 India;

    Department of Mechanical Engineering Dr. B.R. Ambedkar National Institute of Technology Jalandhar Punjab 144011 India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    swirl; interactions; co-and-counter; CFD; impingement;

    机译：漩涡;互动;共同柜台;CFD;冲击;

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