Finite element calculation method for nonlinear gas-solid coupling heat exchange problem

Abstract

The invention discloses a finite element calculation method for a nonlinear gas-solid coupling heat exchange problem, and relates to the technical field of heat transfer science, finite element methods and aero-engine design. The method comprises the following steps of reading an axisymmetric part three-dimensional geometric model file established by a CAD system, and carrying out detail feature processing; selecting and intercepting an axisymmetric meridian plane to obtain a two-dimensional geometric model; dividing the meridian plane into the triangular unit grids; establishing a finite element model of the internal triangular unit and the boundary unit; superposing and synthesizing an integral finite element model of the axisymmetric region to obtain a linear algebraic equation set about all node temperatures; and solving the linear algebraic equation set, obtaining a numerical value of the node temperature, and carrying out computer graphic visualization display. According to the method, the defects of a classic heat transfer analysis method are overcome, the coupling effect of the gas-solid heat exchange is fully considered, compared with a linear gas-solid heat coupling algorithm, the temperature field distribution of an aero-engine part structure can be more accurately calculated, and the design level is improved.

Description

technical field [0001] The invention relates to the technical fields of heat transfer, finite element method and aeroengine design, in particular to a finite element calculation method for a nonlinear gas-solid coupled heat transfer problem. Background technique [0002] The development of aero-engines is of great significance to national economic construction and national defense construction, and reflects a country's technical level and industrial capabilities. There is still a large gap between my country's aero-engine development level and the world's advanced level. Breaking through foreign technology monopoly and innovatively developing high-performance aero-engines have become arduous tasks for the scientific and industrial circles. [0003] At present, my country is developing high-performance military aeroengines. In order to increase the thrust, the temperature of the gas in front of the turbine needs to be greatly increased, and at the same time, the structural we...

AI Technical Summary

Problems solved by technology

This traditional heat transfer analysis method does not consider the coupling heat transfer effect of the gas-solid boundary, which will cause large calculation errors under high temperature conditions, and cannot accurately calculate the temperature field of parts such as turbines, which restricts the design level of my country's aero-engines

[0021] Therefore, those skilled in the art are committed to developing a finite element calculation method for nonlinear gas-solid coupling heat transfer problems, aiming at the flow of cooling gas in aeroengine design In the process, due to heat absorption, the temperature rises, which in turn leads to the technical problem of a sharp decrease in the cooling efficiency of the gas to the solid (such as a turbine disk). Based on the principle of energy balance in the heat transfer process, a nonlinear six-node triangular element finite element model is established, and an effective numerical calculation method is proposed

Images