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Aerodynamics of axisymmetric counterflowing jets

机译:轴对称逆流射流的空气动力学

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摘要

The laminar flow resulting from impingement of two steadily fed low-Mach-number gaseous jets issuing into a stagnant atmosphere from coaxial cylindrical ducts at moderately large Reynolds numbers, often used in combustion experiments, is studied through numerical integrations of the Navier-Stokes equations. In the Reynolds-number range addressed, 50-1000, the flow of the approaching jets is nearly inviscid, with viscous effects and mixing being restricted to the thin mixing layers surrounding the jets and to a thin layer located at the separating stream surface. The analysis of the main inviscid flow shows that only two parameters, based on the scales associated with the radius and the velocity profiles of the two feed streams, are needed to characterize the flow, namely, the ratio of the inter-jet separation distance to the duct radius and the ratio of momentum fluxes of the jets. The numerical results for uniform and Poiseuille velocity profiles provide, in particular, the value of the strain rate at the stagnation point for use in the analysis of experimental studies of counterflow premixed and diffusion flames. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译:通过在Navier-Stokes方程的数值积分中研究了在燃烧实验中经常使用的两个稳定馈入的低马赫数气态射流的撞击所产生的层流,这些气态射流从同轴圆柱管以中等大的雷诺数进入了停滞的大气,通常用于燃烧实验。在雷诺数范围(50-1000)中,接近的射流几乎不可见,粘性作用和混合仅限于围绕射流的薄混合层以及位于分离流表面的薄层。对主要无粘性流的分析表明,基于与两个进料流的半径和速度分布相关的比例,只需两个参数即可表征流,即,射流间分离距离与射流之间的距离之比。管道半径和射流的动量通量之比。均匀速度和泊氏速度曲线的数值结果特别提供了滞流点处的应变率值,用于分析逆流预混火焰和扩散火焰的实验研究。 (C)2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2017年第3期|137-143|共7页
  • 作者单位

    Univ Politecn Madrid, ETSI Ind, E-28006 Madrid, Spain;

    ETSI Aeronaut, Pl Cardenal Cisneros 3, Madrid 28040, Spain;

    Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA;

    Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA;

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

    Counterflow combustor; Strain rate; Impinging jets;

    机译:逆流燃烧室;应变率;冲击射流;

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