贴体坐标系下复杂形体介质内辐射传递研究

Radiative heat transfer in complex geometry in body-fitted coordinates

为了解决复杂几何形体介质辐射传递的求解问题,推导了贴体坐标系下有限体积法的计算公式,编制了计算程序,并与射线踪迹法、离散坐标法及其他方法进行了比较,结果表明,该方法计算结果准确.以椭圆柱腔体内辐射传递为例,研究了衰减系数对温度场的影响,衰减系数较小时,随衰减系数的增加,对温度场的影响也增加;考察了各向同性散射及各向异性散射条件下,反照率等对壁面热流的影响,对于各向异性散射,衰减系数较大时,反照率对于壁面热流的影响较大.

In order to solve the problem of radiative heat transfer in the media with complex geometry, equations have been developed for the finite-volume method in body-fitted coordinates and computer programs have been compiled. The computational results are compared with those obtained by ray tracing, discrete ordinates method and other solutions, and it is concluded that the computational results are reliable. The influence of the extinction coefficients on the temperature profile is studied. When the value of the extinction coefficient is small, the temperature field changes apparently with the increase of the extinction coefficient. And the influence of scattering albedos on the heat flux distribution in isotropic scattering media and anisotropic scattering media is explored, and it is found that for anisotropic scattering, when the value of the extinction coefficient is big, the heat flux along the wall changes apparently with the scattering albedo.