An improved Monte Carlo method (IMCM) is developed to solve radiative heat transfer in participating media in this work. Monte Carlo method (MCM) as a high-precision method has good applicability for the calculation of radiative heat transfer in a complex-shape medium. However, it is highly time-consuming for a large number of energy beams tracing, which limits its application in practical engineering. To overcome this problem of the MCM, there are two improvements proposed: 1) the location of the zone emission points and the number of emission energy beams are subdivided; and 2) the energy of reflection and scattering part is solved by proportional iteration accumulation. In the IMCM, the reflection and scattering processing only needs to be calculated once, which significantly reduces the computing time of a large number of energy beams tracing. A series of radiative heat transfer problems in a two-dimensional cylindrical enclosure with different absorption coefficients, wall emissivity, and scattering albedo are studied, and results show that the IMCM is a high-precision and high-efficiency method for radiative heat transfer.

开发了一种改进的蒙特卡洛方法（IMCM），以解决这项工作中参与介质的辐射热传递。蒙特卡洛方法（MCM）作为一种高精度方法，在计算复杂形状介质中的辐射热传递方面具有良好的适用性。但是，跟踪大量的能量束非常耗时，这限制了它在实际工程中的应用。为克服MCM的这一问题，提出了两项​​改进措施：1）将区域发射点的位置和发射能量束的数量进行细分；2）反射和散射部分的能量通过比例迭代累加来求解。在IMCM中，反射和散射处理仅需要计算一次，这大大减少了大量能量束跟踪的计算时间。