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.
The infrared signal in 3～5μm band of an axisymmetric nozzle was calculated to investigate the improvement of the temperature corrected k-εturbulence 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-εmodel and the temperature corrected k-εmodel 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-εmodel 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-εmodel is appropriate for accurate simulation of IR characteristics of exhaust system.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2013年第9期1942-1948,共7页
Journal of Aerospace Power
关键词
温度修正
湍流模型
排气系统
红外辐射
有限体积法
temperature corrected
turbulence model
exhaust system
infrared radiation
finite volume method
