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首页> 外文期刊>International Journal of Heat and Mass Transfer >A simplified model for fast estimating infrared thermal radiation of low-altitude under-expanded exhaust plumes
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A simplified model for fast estimating infrared thermal radiation of low-altitude under-expanded exhaust plumes

机译：快速估算低空膨胀不足烟羽红外热辐射的简化模型

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摘要

In this paper, a fast estimating method of thermal infrared radiation signatures for low-altitude exhaust plumes was proposed. In engineering application, it is essential to predict the thermal radiation effect of the plume as soon as possible. A simple numerical model was established considering thermal, species formation, entrainment and radiating effects. In this methodology, the mixing region was treated as a hot, under-expanded, reacting and isotonic flow. The reacting flows were simulated by solving the governing equations with finite rate kinetics and conservation matching relations. A single-line-group (SLG) model with Curtis-Godson approximation was utilized to evaluate radiative properties of radiating species. A line-of-sight (LOS) method was used to compute the spectral radiation intensity. This computational model was verified against the Atlas-II's reference data within the wavelengths of 2-61 mu m. The simulation analyzed combustion flows and infrared thermal effects of a typical exhaust plume along flight trajectory points. Results show that the current model can dramatically improve the computational efficiency by 100-1000 times by comparing with the commonly used method. According to this model, the plume's range and an appropriable cutoff temperature for thermal radiation calculations are easy to obtain. Infrared radiation phenomena accord with the experimental observations. As a main outcome, this simple model can provide a time-saving and range-unlimited method for the infrared radiation signature prediction of a low-altitude plume in engineering application. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文提出了一种低空排气羽热红外辐射特征的快速估计方法。在工程应用中，必须尽快预测烟流的热辐射效应。建立了考虑热，物种形成，夹带和辐射效应的简单数值模型。在这种方法中，将混合区域视为热，膨胀不足，反应和等渗流。通过求解具有有限速率动力学和守恒匹配关系的控制方程来模拟反应流。利用Curtis-Godson近似的单线组（SLG）模型评估辐射物种的辐射特性。视线（LOS）方法用于计算光谱辐射强度。在2-61微米的波长范围内，针对Atlas-II的参考数据验证了此计算模型。该模拟分析了沿飞行轨迹点的典型排气羽流的燃烧流和红外热效应。结果表明，与常用方法相比，该模型可以将计算效率大大提高100-1000倍。根据该模型，很容易获得羽流的范围和用于热辐射计算的合适的截止温度。红外辐射现象符合实验观察。作为主要成果，该简单模型可以为工程应用中的低空羽流的红外辐射特征预测提供一种省时且不受范围限制的方法。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
  • 作者

    Niu Qinglin; Fu Debin; Dong Shikui; Tan Heping;

  • 作者单位

    Harbin Inst Technol, Minist Ind & Informat Technol, Key Lab Aerosp Thermophys, Harbin 150001, Heilongjiang, Peoples R China|Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China;

    Beijing Inst Technol, Sch Aerosp Engn, Beijing 100081, Peoples R China;

    Harbin Inst Technol, Minist Ind & Informat Technol, Key Lab Aerosp Thermophys, Harbin 150001, Heilongjiang, Peoples R China|Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Minist Ind & Informat Technol, Key Lab Aerosp Thermophys, Harbin 150001, Heilongjiang, Peoples R China|Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China;

  • 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

    Rocket exhaust plume; Infrared radiation; Fast method; Afterburning; Entrainment;

    机译：火箭尾羽;红外辐射;快速方法;后燃;夹带;

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