Graphite heating element, graphite heater and design method

Abstract

The invention provides a graphite heating element, a graphite heater and a design method. The graphite heater comprises n layers of graphite heating element layers (n≥1), and the n layers of graphite heating element layers form an axisymmetric prism structure. Wherein, each graphite heating element layer is composed of several isosceles trapezoidal graphite heating elements in the circumferential direction to form an axisymmetric closed structure, and the bases of the graphite heating elements constituting each graphite heating element layer form a regular polygon, and each The number of sides of the layered regular polygons is the same, the circumscribed circles of each regular polygon are parallel and coaxial, the upper surface of the graphite heating element layer of the i+1 layer is coplanar with the bottom surface of the regular polygon of the i-th layer of graphite heating element layer and the shape Same, i=1,2,...n. By designing the graphite heating element into an isosceles trapezoidal structure, the present invention not only can effectively reduce the specification and quantity of the element, but also has strong interchangeability and convenient installation; it also has certain versatility for rotating bodies of different sizes or structures similar to rotating bodies. Sex, reduce test costs.

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

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