Performance variation of a transient dynamic fluid-structure interaction system in different life stages and methods for maintaining the performance

Abstract

Performance variation in different life stages of dynamic systems subjected to severe fluid-structure interactions is unavoidable. A weak coupling model governing the combustion of propellants in a chamber with moving boundaries was presented. The model is capable of considering not only the interactions between the projectile and the barrel but also the volume enlargement caused by wear and erosion. The weak coupling of the model calculation was realized using an interface in the commercial ABAQUS(R) software. The weak coupling model was validated through comparing with a classical model and experiments. The diameter increments of a gun bore were measured to construct models used in the simulations. Based on the validated model, the performance variations of the gun in different life stages were investigated. Furthermore, pressure and temperature distributions of the core flows along the barrel were provided. Mechanism of the performance degradation was elucidated. Finally, two kinds of approaches were provided to maintain the performance of the internal combustion system. Considering the sensitivity of the combustion to the two factors, a method of adjusting the charge mass is advisable in engineering.