Abstract: The silencer layer is corrosively damaged by high temperature and high speed jet flow of rocket engine in the launching process. This affects the launching safety.The analysis of jet flow erosion damage is important to the late repair of silencer layer and the optimization of silo structure. The jet flow erosion damage to the silo silencer layer is a complicated thermal-hydro-mechanical coupling problem. The typical glass wool silencer layer is researched to build the phase change heat transfer and jet flow erosion damage mathematic models. A simulation platform of jet flow erosion damage is established by extracting and pretreating the jet flow field data, writing an interpolation program and developing Abaqus user subroutine. And a sub-model method is introduced to build a glass wool numerical simulation model. The ablation process of glass wool was simulated, the ablation damage was analyzed under the effects of silo diameter, initial height of jet flow and engine pressure build-up speed, and the simulation and ablation damage principle experiment for silo silencer layer were performed. The simulated results show that the glass wool silencer layer of the silo is generally damaged during jet flow ablation, which mainly occurs in the reverse flow and destabilizing stage. And the ablation damage is similar in the circumferential direction of the silo, but different in the axial direction. In addition, the damage is more serious closer to the bottom of silo, and the decreased diameter of silo or the increased pressure build-up speed of engine would aggravate ablation. But the increased initial height of jet flow will weaken ablation. The experimental results show that the glass wools are all damaged to a certain extent.

Key words: rocketlaunching, silo, jetflow, glasswool, silencerlayer, thermal-hydro-mechanicalcoupling, ablationdamage