Curved-surface graphite heater design method

Abstract

The invention belongs to the technical field of radiant electric heating, and particularly relates to a curved surface graphite heater design method, which comprises the steps of performing mesh generation on an ideal heating curved surface of a test piece to generate a finite element model comprising a plurality of quadrilateral units or coexistence of the quadrilateral units and triangular units; carrying out interpolation processing, so as to enable each quadrilateral unit and each triangular unit to correspond to one node plane respectively, and obtaining a coplanar node set composed of athree-node group and a four-node group; in the three-dimensional processing software, generating intersection lines of adjacent reference planes, and generating triangular, quadrilateral and polygonalgraphite flake reference design surfaces through the intersection lines; cutting the edge of the reference design surface of the graphite flake to form a graphite heating surface, and finally designing a heating circuit for the graphite flake of each heating surface according to the heat flow load input requirement required by the test. According to the method, the stability and controllability of large heat flow output of the conformal graphite heater in a complex curved surface appearance structure heat intensity test are achieved.

Description

technical field [0001] The application belongs to the technical field of radiant electric heating, and in particular relates to a design method of a curved graphite heater. Background technique [0002] When the aircraft flies in the atmosphere at extremely high speeds, the body structure will be subjected to severe aerodynamic heating loads. In order to verify and confirm the performance of the structure in this extreme environment before the first flight, hypersonic aircraft and orbital reentry All aircraft need to undergo ground verification tests. In this kind of experiment, the simulation of the thermal environment requires a heater with high heat output capability and precise control. At present, the maximum heat output capacity of the widely used quartz lamp heater is about 1200kW / m 2 , the maximum temperature of the structure is about 1500°C. For the nose cone and leading edge, the heat output capability of quartz lamps is relatively insufficient due to the high h...

AI Technical Summary

Problems solved by technology

At present, there is no domestic report on the application of graphite heaters in the ground thermal strength verification of complex curved surface structures. In the data, NASA Johnson Center used conformal graphite heaters in the nose cone test of the space shuttle, but there are not enough relevant pictures in the data. Clear, the composition of the conformal heater is unclear, and the design and implementation method of the conformal graphite heater is also lacking

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