Dynamic testing device and method for ablation rate of material

Abstract

The invention relates to a dynamic testing device and method for the ablation rate of a material. The dynamic testing device comprises a CCD (Charge Coupled Device) camera, wherein a light filter group is mounted in front of a multi-focal-length camera lens and is used for blocking highlight emitted from a test piece and simultaneously allowing the transmission of lasers for demarcating a position; the position is demarcated by the positioning cross-shaped lasers; an electric arc heating spray gun is utilized to heat the end face of a to-be-tested ablative material; the whole device is positioned by a positioning bracket to enable the electric arc heating spray gun and the to-be-tested ablative material to be located on the same axis, and the point of intersection of the positioning cross-shaped lasers is throughout maintained on the center of the end face during a backward movement process of the end face; the CCD camera and the to-be-tested ablative material are located in the same horizontal position, a phase plane of the CCD camera is parallel with the axis of the to-be-tested ablative material, and the CCD camera is connected with a computer and is used for collecting and storing test images. According to the dynamic testing device, the dynamic ablation quantity test experiment of materials, such as graphite and vycor, can be implemented under an electric arc heating condition; the dynamic testing device has the advantages that the experiment cost is low, and that the experiment temperature is easy to control.

Description

technical field [0001] The invention relates to a dynamic testing device and method for material ablation rate. Background technique [0002] In the development of heat protection technology, the most mature heat protection mechanism is ablative heat protection. Ablative heat shielding materials are commonly used on RV exterior surfaces. During the process of the reentry vehicle returning to the atmosphere, under the action of heat flow, the ablation heat shield of the reentry vehicle undergoes various physical and chemical changes that absorb heat energy, such as decomposition, melting, evaporation, and sublimation, and is taken away by the mass consumption of the material itself. A large amount of heat energy is used to prevent the heat from being introduced into the interior of the aircraft. [0003] The ablation of materials directly affects the aerodynamic shape of the aircraft. Accurate testing of ablation rate is the basis and premise of thermal structure design. At...

AI Technical Summary

Problems solved by technology

This method is affected by the spot size of the laser transmitter. The ablation rate of the ablation material line to be tested is actually the cumulative value of multi-segment average data rather than real-time data. It cannot characterize the ablation material line to be tested well. The change of the ablation amount with the ablation time, at the same time, the anti-interference ability of the laser receiver, the stability of the gantry and the feeding accuracy are quite high, and there are certain technical limitations.

[0006] At present, there is a lack of research on dynamic ablation experiments in China, and a breakthrough in dynamic ablation experiments is urgently needed

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