用温度修正的<em>k-ε</em>模型研究排气系统红外辐射特性

李喜喜; 额日其太; 朱希娟; 吴盟

用温度修正的k-ε模型研究排气系统红外辐射特性

1.
北京航空航天大学能源与动力工程学院, 北京100191
2.
中国航天科工集团公司第二研究院光学辐射重点实验室, 北京100854
3.
中国航空工业集团公司成都发动机(集团)有限公司, 成都610503

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出版历程
- 收稿日期: 2012-08-07
- 刊出日期: 2013-09-28

Infrared radiation characteristics of exhaust system using temperature corrected k-ε model

1.
School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
2.
The Second Academy of China Aerospace Science and Industry Corporation, Science and Technology on Optical Radiation Laboratory, Beijing 100854, China
3.
Chengdu Engine(Group)Company Limited, Aviation Industry Corporation of China, Chengdu 610503, China

摘要

摘要: 为研究温度修正的k-ε湍流模型对排气系统红外辐射特性计算精度的改善程度,计算了某轴对称收敛喷管在3~5μm波段的空腔-喷流组合红外辐射特性,并与试验结果对比.喷管流场及温度场采用有限体积法(FVM)求解Navier-Stokes(N-S)方程得到,湍流模型分别采用标准k-ε模型和温度修正的k-ε模型.红外辐射特性的计算采用有限体积法求解吸收-发射性介质条件下的三维辐射传输方程,并考虑大气衰减作用.计算结果表明:温度修正的k-ε模型可有效预测排气系统热喷流的核心区长度,从而获得与试验结果一致的红外辐射强度.与标准k-ε模型相比,采用温度修正的k-ε模型计算得到的红外辐射强度的最大相对误差由64%降至了4.3%,说明温度修正的k-ε模型适用于精确模拟排气系统的红外辐射特性.
- 温度修正 /
- 湍流模型 /
- 排气系统 /
- 红外辐射 /
- 有限体积法
Abstract: The infrared signal in 3~5μm band of an axisymmetric nozzle was calculated to investigate the improvement of the temperature corrected k-ε turbulence model in the infrared radiation(IR) of exhaust system,and compared with the experimental results.The flow fields and temperature fields of nozzle were simulated numerically by using finite volume method(FVM) and solving Navier-Stokes(N-S) equations,and coupled with the standard k-ε model and the temperature corrected k-ε model respectively.The IR signal was calculated by FVM in non-gray absorbing-emitting media to slove the 3-D radiative transfer equation,and the atmosphere attenuation effect on IR was considered.The results show that the temperature corrected k-ε model can predict the potential core length of hot jet,and consequently the IR intensity agrees with the experiment data.The maximum value of relative error for IR intensity obtained using the temperature corrected k-ε model is 4.3%,while that obtained using the standard k-ε model is up to 64%.This shows that the temperature corrected k-ε model is appropriate for accurate simulation of IR characteristics of exhaust system.
- temperature corrected /
- turbulence model /
- exhaust system /
- infrared radiation /
- finite volume method

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