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Fluid-Thermal-Structural Characteristics of Spiral Square Channel


 The extremely hot environment attributed to the combustion and aerodynamic heating exposes the scramjets to intense thermal-structural loads. The scramjet life is limited due to the wall cracks caused by the large temperature difference. The focus of this study was performing coupled 3D fluid-thermal-structural analysis of the cooling jacket for scramjet engines. Firstly, the mathematical models and the simulation method were established. The three-dimensional computational fluid dynamics numerical simulations were based on the conservation equations of mass, momentum, and energy. Strain compatibility, equilibrium equations, and constitutive law of elastic solids were applied for the 3D static thermal-structural analysis. Secondly, the fluid-thermal-structural analysis was performed. Results show that both large temperature difference and structure geometry have an obvious impact on the deformation of the cooling channel. Highest deformation (2.1%) of the straight square channel occurs at the middle of the hot side ligament. Compared with the straight square channel, the maximum temperature of the triangular channel and the spiral square channel is reduced by 7.3% and 26.1%, and the total deformation is increased by 5.0% and reduced by 28.3%, respectively.