Thermal Stress Research On Ceramic Honeycomb Regenerator

Ceramic honeycomb regenerator is the core parts of regenerative heat exchange technology. In the past, the mainly researches of ceramic honeycomb regenerator were focused on the heat transfer characteristics and the resistance character, while the studies in a state of thermal shock resistance were rare, which was one of the main factors of deciding its service life.According to the storage and release heat test of regenerator, the paper established ceramic honeycomb regenerator geometry model, heat transfer mathematical model and boundary condition. By the method of numerical simulation, the effect of structural parameters and operating parameters on the regenerator behavior was studied, and numerical simulation results were compared and analyzed with the experimental results. Then by the analyses, the rationality of calculation method was proved.Based on the fluid dynamics and heat transfer theory, with the help of the transient heat transfer method, the distribution of velocity and temperature of gas was obtained, and the temperature distribution of the regenerator, and then the outlet temperature of gas variation with time was also obtained.In the fluid-solid interface theory basis, a linear static structure mathematical model was established. By the method of numerical simulation, the effect of structural parameters and operating parameters on thermal stress was investigated. At the same time, the relationship between the biggest stress position and the thermal shock area was analyzed.Besides, the orthogonal experiment method was used to optimize the design of main thermal shock resistance properties. The optimal level combination was determined by using range analysis, and the result was demonstrated by using simulation method to prove the consistency between the optimum scheme and the actual.The work in this paper provides a theory basis and guide to the optimization design of ceramic honeycomb regenerator, and the results of the numerical calculation can be used as the foundation of engineering design.