Numerical simulation of muffler cover temperature analysis for general purpose engine based on CFD.

Theoretical analysis and performance evaluation is of great significance to give guidance for engineers designing a better muffler cover of general purpose engine with higher success rate and less experiment trails. Therefore, in order to construct a accurate numerical prediction of muffler temperature analysis accounting for the effects of boundary conditions on temperature results calculation, CFD technology was adopted and the muffler cover of general purpose engines at three different starter states were chosen to carry out this research. Simulation results showed that the simulation results of muffler cover temperature increased with the increase of radiation emissivity and thermal status, and became more consistent with experimental values with the increase of prism layers. The temperature distributions and boundary radiosity distributions of muffler cover for different starter were basically the same. Average temperature of muffler cover was between 60 and70°C under three kinds of starter conditions, and the temperature distribution was reasonable, proving that the design of muffler cover was feasible.The temperature numerical results were basically consistent with the experimental results, and the relative error was within 10%, which indicated that prediction value can be reliable when all boundary conditions were set reasonably and physical-mathematical models was solved with right calculation methods. The research results in this paper can provide a theoretical basis for the early-design and developing of muffler cover for general purpose engine. [ABSTRACT FROM AUTHOR]