Graphite heater, design method and graphite heating element used

Abstract

The invention provides a graphite heater, a design method and a graphite heating element used. The graphite heater comprises n layers of graphite heating element layers (n≥1), and each layer of graphite heating element layer is composed of several triangular graphite heating elements. An axisymmetric closed structure is formed in the circumferential direction, and the bases of the graphite heating elements constituting each layer of the graphite heating element layer form a regular polygon, and the side lengths of the regular polygons are the same, and the circumscribed circles of each regular polygon are parallel and coaxial. The upper surface of the +1 graphite heating element layer is coplanar and has the same shape as the bottom surface of the regular polygon of the i-th graphite heating element layer, i=1, 2,...n. The graphite heater provided in the present invention not only greatly reduces the specification and quantity of heating elements required, but also utilizes the characteristics of a plane determined by three points of a triangle, so that the effect of profiling and radiation heating is better; in addition, under the unit area, the triangular shape Larger size for easier mechanical connection.

Description

technical field [0001] The invention belongs to the technical field of aircraft structural heat test, relates to a graphite heater, a design method and a graphite heating element used, in particular to a graphite heater, a design method and a graphite heater used for a test piece of a rotating body or similar to a rotating body Graphite heating elements used. Background technique [0002] As the Mach number of the aircraft is getting higher and higher, the corresponding aerodynamic heating problem is becoming more and more serious. The local maximum temperature is above 1400°C, and the instantaneous heat flux can reach 1.2MW / m 2 Above, this puts forward higher technical requirements for the thermal test of the traditional ground environment structure. [0003] In the case that the heating temperature of the traditional quartz lamp can only reach 1200 ℃ ~ 1300 ℃, graphite is more used as the radiation heating element in the structural thermal test because of its high heating...

AI Technical Summary

Problems solved by technology

When the heated test piece is a conventional square or circular shape, the graphite heater composed of rod-shaped graphite heating elements can achieve a good radiation heating effect; but when the test piece is a rotating body or a structure similar to a rotating body, such as a cone Shaped structure, this kind of rod-shaped graphite heater will not only result in a large number of required components, long production and processing cycle, and high cost, but also the mechanical connection space at both ends of the element is small, the operation is cumbersome, and the installation process is prone to breakage

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