With the increase of the gas temperature in the combustion chamber of the aero engine, the problem of radiation in the high temperature area will become more important. At the same time, the radiation characteristics will change drastically due to high temperature gas radiation, which will show a multi-scale phenomenon and thus increase the difficulty of radiation calculation. This paper uses the idea of steady discrete unified gas kinetics scheme (SDUGKS) to solve the steady-state radiation problem. SDUGKS schemes uses the method of differential discretization by characteristic line to achieve reconstruction of the unit interface, and realizes update of cell data through a certain iterative format. This process realizes effective simulation of the radiation characteristics inside the grid. The process can be applied to any specific radiation scale, so that the calculation of multi-scale problems can be realized under any grid condition. This paper introduces the deferred-correction (DC) method to update unit data, and calculates the single-scale and multi-scale problems. For the single-scale problem, the SDUGKS format is verified to be applicable for the steady-state radiation problem. The multi-scale problem is further constructed to be solved, which verifies the asymptotic preservation and accuracy of SDUGKS in calculation of multi-scale problems.
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