Rapid prediction method for heat transfer characteristic of periodic structure composite material at high temperature

Abstract

The invention discloses a rapid prediction method for heat conduction-radiation coupling heat transfer characteristics of a periodic structure composite material at a high temperature, and the method comprises the steps: decomposing a to-be-solved temperature field into a macroscopic average field and a mesoscopic temperature fluctuation through a multi-scale progressive analysis method, respectively carrying out the calculation, and finally reconstructing the macroscopic average field and the mesoscopic temperature fluctuation into a complete temperature field. The calculation process comprises the steps of carrying out grid division on a macroscopic prediction model and a characterization unit under a microscopic scale, solving a periodic vector function in the characterization unit under the microscopic scale, calculating macroscopic equivalent physical property parameters, solving a macroscopic scale heat conduction-radiation coupling heat transfer equation, and finally reconstructing a multi-scale temperature field. The multi-scale model established by the method can accurately calculate the temperature field of the periodic structure composite material, and can significantly improve the prediction rate of the high-temperature heat transfer characteristic of the composite material.

Description

technical field [0001] The invention belongs to the technical field of aircraft thermal protection, in particular to a rapid prediction method for the heat transfer characteristics of periodic structural composite materials at high temperatures. Background technique [0002] Thermal protection systems and materials are the key to ensuring the safe service of hypersonic vehicles in extreme flight environments. Especially since the 21st century, the performance requirements of new thermal protection materials in the aerospace field are getting higher and higher. In order to improve the survivability of aircraft, high-efficiency thermal protection systems and thermal protection materials must improve their ability to withstand extreme service environments. Composite materials with periodic structures such as particle reinforcement and fiber reinforcement have become commonly used thermal protection materials for aerospace vehicles. Accurately predicting the heat transfer charac...

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Problems solved by technology

The research on multi-scale heat transfer prediction models has been widely used in the field of heat and mass transfer analysis of composite materials, but most of the prediction models only involve pure heat conduction problems, and seldom consider the radiation transfer process at extreme high temperatures, or radiation is only heat transfer. The internal boundary conditions of the process model do not analyze the radiative transfer process

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