Graphite heating elements, graphite heater and design method

Abstract

The invention provides a graphite heating element, a graphite heater and a design method. The graphite heater contains n layers of graphite heating element layers (n is not less than 1); the n layersof graphite heating element layers form an axisymmetric prism structure, wherein each layer of graphite heating element layer forms an axisymmetric enclosed structure through multiple graphite heatingelements in isosceles trapezoid structure on the circumference, the bottom sides of the graphite heating elements forming each layer of graphite heating element layer form a regular polygon, and thenumber of side of the polygon at each layer is consistent, circumcircles of the regular polygons are parallel and coaxial, an upper surface of the i+1-th layer of graphite heating element layer and the regular polygon bottom surface of the i-th layer of graphite heating element layer are coplanar and have the same shape, and i is equal to 1, 2, ...n. By designing the graphite heating elements intoisosceles trapezoids structures, the specification and number of the element can be effectively reduced, the interchangeability is strong, and the mounting is convenient; for revolving bodies or similar revolving body structures in different sizes, a certain generality is provided, and the test expenditure is reduced.

Description

technical field [0001] The invention belongs to the technical field of thermal test of aircraft structure, relates to a graphite heating element, a graphite heater and a design method, in particular to a graphite heating element, a graphite heater and a test piece used for a rotary body or a test piece similar to a rotary body design method. 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 temperature, good...

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

Images