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Surface Heat Transfer Measurements Inside a Supersonic Combustor by Laser-Induced Fluorescence

机译:超音速燃烧器内部的激光诱导荧光表面传热测量

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摘要

A study has been conducted to measure surface temperatures inside a model rectangular supersonic combustor by the use of a nonintrusive thermal imaging system, based on the fluorescence properties of a dysprosium doped yttrium-aluminum-garnet (Dy~(3+):YAG) thermographic phosphor. In this system, the phosphor coating on the test surface is excited by a pulsed Nd:YAG laser. The resulting fluorescent emission of the temperature-sensitive 456-nm transition and that of the temperature-independent 496-nm transition are acquired by the use of a pair of image-intensified charge-coupled device cameras. The ratio of the acquired emissions is then correlated to temperature. The wind tunnel was a blowdown type that used vitiated air with nominal conditions at the entrance of the test section: M_∞ =2.5, P_0 = 5 X 10~5 N/m~2, T_0 = 800 K, and Re_∞/m = 9.6 X 10~6. The fuel was hydrogen gas at room temperature, injected parallel to the tunnel through a fuel-injector slit located along the backward surface of a step. The results under hot flow conditions were compared with numerical simulations performed using a two-dimensional Navier-Stokes code with full chemistry. Temperature measurements demonstrate the feasibility of laser-induced fluorescence for surface heat transfer studies in reactive flows involving significant unsteadiness and transient phenomena.
机译:基于a掺杂钇铝石榴石(Dy〜(3 +):YAG)热像图的荧光特性,已经进行了一项研究,通过使用非侵入式热成像系统来测量矩形矩形超声燃烧器内部的表面温度。磷。在这个系统中,测试表面上的荧光粉涂层被Nd:YAG脉冲激光激发。通过使用一对图像增强的电荷耦合器件相机获得了温度敏感的456 nm跃迁和独立于温度的496 nm跃迁的荧光发射。然后,将获得的排放物的比例与温度相关联。风洞是一种排污式,在测试部分的入口处使用标称条件的通风空气:M_∞= 2.5,P_0 = 5 X 10〜5 N / m〜2,T_0 = 800 K和Re_∞/ m = 9.6 X 10〜6。燃料是室温下的氢气,通过沿着台阶后表面的燃料喷射器狭缝平行于隧道喷射。将热流条件下的结果与使用具有完整化学性质的二维Navier-Stokes码进行的数值模拟进行了比较。温度测量表明,在涉及显着不稳定和瞬态现象的反应性流中,激光诱导的荧光用于表面传热研究的可行性。

著录项

  • 来源
    《Journal of Thermophysics and Heat Transfer》 |2003年第3期|p.320-325|共6页
  • 作者

    K. Kontis;

  • 作者单位

    Department of Mechanical, Aerospace, and Manufacturing Engineering, Division of Thermofluids, Institute of Science and Technology, P.O. Box 88;

  • 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 理论物理学;
  • 关键词

  • 入库时间 2022-08-18 03:01:40

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