Three-section electric arc heating thrustor

Abstract

The invention relates to a three-section electric arc heating thrustor which adopts a sectional structure and is divided into three sections, comprising an anode section, a transitional section and high heat-resistance section. The anode section is welded and fixed inside one end of the transitional section. The other end of the transitional section is welded and fixed with the high heat-resistance section to from a shell. In the invention, high temperature performance, structural strength, conductive performance and welding performance are respectively concerned according to requirements of different parts of the thrustor on materials, thereby reducing the difficulty of selecting materials, meeting the requirements of physical properties of the materials such as using temperature, conductive coefficient, strength and the like in different temperature ranges and satisfying the welding requirements of the whole structure, so as to realize the engineering design of the structural piece of the thrustor. In the invention, the three-section structure is adopted and the three sections are made of materials with different heat resistances and heat expansion coefficients, thereby improving the axial temperature gradient of the thrustor, solving the match problem in welding of different materials and meeting the requirements of the thrustor on distribution of working temperatures with a limit size.

Description

technical field [0001] The invention relates to a segmented arc heating thruster, in particular to a three-stage arc heating thruster, which belongs to the technical field of arc heating thruster structure design. Background technique [0002] Arc-heated thrusters are usually in the shape of a long, thin rod with a nozzle at one end and an electrical connector at the other. For this kind of thruster with a slender rod-like structure, the temperature of the casing near the anode (nozzle) is about 1200°C, and the temperature of the central area of ​​the anode can reach more than 2000°C; the temperature of the rear part of the thruster (electrical connector) is about 200°C . In terms of design, in order to improve the life of the anode, the temperature in the central area of ​​the anode should be reduced as much as possible; in order to ensure the reliability of the electrical connector, the temperature at the end of the electrical connector should be reduced as much as possib...

AI Technical Summary

Problems solved by technology

Due to the difficulties in processing and material preparation, high-temperature-resistant tungsten alloy materials cannot be used for this structure, and the temperature gradient in the axial direction of the entire thruster is difficult to increase, and it is difficult to realize the thermal design of the thruster. This structure is a laboratory prototype and is difficult to grow. time work;

[0005] The other is the shell and inner core structure. The thruster shell is made of stainless steel and high-temperature alloy, and the inner core is made of tungsten alloy as the anode material. Due to the large difference in thermal expansion coefficient between the two materials of this structure, the welding performance is poor. The thermal conductivity of stainless steel is high, and it is difficult to realize the thermal design of the thruster. This structure is also a laboratory prototype and cannot be applied to engineering practice.

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