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Simulation of Ablation Behavior for Carbon/Carbon Composite Material

Author: YangDeJun
Tutor: LanZuoFengï¼›LiXuDong
School: Lanzhou University of Technology
Course: Materials Processing Engineering
Keywords: Numerical Simulation Carbon / carbon composites Ablation Boundary layer Ablation products Ablation rate
CLC: TB332
Type: Master's thesis
Year: 2011
Downloads: 117
Quote: 0
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Abstract


Carbon / carbon composite material has excellent resistance to high temperature in the high temperature environment, the composite role is to protect the internal structure can withstand the harsh environment of the outside world through its own ablation. Therefore, to study the distribution of temperature field inside the material has an extremely important value in engineering composite ablation process. Carbon / carbon composites in high-temperature, high-enthalpy, high-pressure environment, causing loss of quality due to the physical and chemical factors cause material ablation, ablation of carbon / carbon composites were analyzed by thermal chemical ablation mechanism, combined with mass conservation balance principle of conservation of energy and the system of chemical reactions, thermo-chemical boundary layer model of linear ablation composite temperature field in the boundary mobile under the conditions of the heat conduction equation is solved. Simulated by the numerical simulation method of carbon / carbon composite materials in high-temperature, high-pressure, physical and chemical factors coupled ablation under simulation. Thermochemical ablation process in different environments of the carbon / carbon composites, numerical simulation, the calculation of ablation products. Carbon / carbon composite material under high temperature environment, the the complex physical experience thermochemical ablation occurs - chemical processes. Carbon / carbon composite material under high temperature environment, the complex physical - chemical processes. Experienced thermochemical ablation occurs mainly consider the heat between the air component and wall component chemical product, the main chemical reaction of carbon the oxidation reaction, the sublimation reaction and carbonitrides reaction. The finite element method is currently the most widely used method, because it is flexible to adapt the performance to solve complex engineering problems, this method has been widely used in a variety of engineering applications software to help us solve the computational analysis of the various engineering and technical problems , and engineering software also provides us with a lot of convenient graphical user interface and a wealth of post-processing functions, numerical simulations made an unprecedented breakthrough. In this study, using the finite element method finite element model of carbon / carbon composites, and the structure is divided into a finite element mesh, the final distribution of the composite temperature field in the case of thermochemical ablation solving . Multi-physics coupling analysis software to model the boundary layer equations, the ultimate control of the boundary layer of the air component equations were solved, and thermochemical parameters calculated gas-solid boundary fluid boundary layer Solving and the coupling between the solid structure. Calculation of ablation products under various wall temperature distribution, and analysis of the oxidation products under different environmental parameters and conditions, sublimation of the distribution pattern of the product. Ablation temperature field on the the ablation conditions under carbon / carbon composites by energy conservation equation, numerical simulation, the ablation boundary flinch under high temperature conditions, and calculate the carbon / carbon composite material ablation environment linear ablation rate of composites after ablation ablation morphology changes the numerical simulation, a more complete study of the behavior of the composite material ablation.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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