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Non-contact online monitoring method for electrode ablation of arc heating equipment

An arc heating and non-contact technology, which is applied in measuring devices, color/spectral characteristic measurement, and material analysis through optical means, can solve the problem of unclear specific mechanism, unclear main influencing factors, and lack of real-time electrode ablation. Monitoring and other issues to achieve fast response and real-time monitoring

Active Publication Date: 2019-11-29
中国空气动力研究与发展中心超高速空气动力研究所
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  • Application Information

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Problems solved by technology

However, the specific mechanism of copper electrode ablation is still unclear, and the main influencing factors are still unclear.
The current research on the mechanism of electrode ablation is mainly through the method of manual observation after the test. There is a lack of real-time monitoring of the amount of electrode ablation during the test, and it is impossible to conduct research on factors that greatly deteriorate electrode ablation, such as heater arcing and state mutations.

Method used

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  • Non-contact online monitoring method for electrode ablation of arc heating equipment
  • Non-contact online monitoring method for electrode ablation of arc heating equipment
  • Non-contact online monitoring method for electrode ablation of arc heating equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A non-contact online monitoring method for electrode ablation of arc heating equipment, comprising the following steps:

[0050] Step 1. The arc heating equipment chooses a sheet-type arc heating equipment. The copper front electrode and copper rear electrode in the arc heating equipment are discharged to heat the gas passing through it. The heated gas forms a high-temperature flow field, and the high-temperature flow field passes through the nozzle. An ultra-high-speed airflow field is formed. At this time, there are copper atoms or copper ions formed after the electrodes are burned in the high-temperature flow field;

[0051] Step 2. The laser uses a distributed feedback diode laser (DFB) with a center wavelength of 793.3nm. The laser beam is output through fiber coupling. At this time, the laser wavelength matches the spectral line of the copper atomic absorption spectrum, and the laser emits a laser beam. The laser beam It emits from one end of the flange of the las...

Embodiment 2

[0065] This embodiment is basically the same as the embodiment 1, the main difference is that the laser used is a distributed feedback diode laser (DFB) with a center wavelength of 809.3 nm. The temperature of the high-temperature flow field can be obtained from the state parameters of the arc heater. Under the condition of thermodynamic equilibrium, the number density of low energy levels n i and the total atomic number density N A Satisfy the Boltzmann relationship between them, through the spectral database, use the normalization condition of the linear function to calculate the area of ​​the absorption curve, and the number density n of Cu atoms can be obtained i , using the Boltzmann relationship to obtain the Cu atomic number density, and considering the number of Cu ion particles formed by the ionization of Cu atoms at high temperature, after data processing, the following can be obtained: Figure 4 When the shown copper atoms have laser wavelengths of 793.3nm and 809....

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Abstract

The invention discloses a non-contact online monitoring method for electrode ablation of an arc heating device. The non-contact online monitoring method includes the steps that based on a tunable diode laser absorption spectroscopy technology, a laser beam with wavelength matched with a copper atomic absorption spectrum line is used for penetrating an internal high-temperature flow field in the arc heating device, copper atoms in the high-temperature flow field and the laser perform absorption, by measuring the absorbed degree of laser and combining with the state parameters of a heater, the mass of the copper atoms and copper ion components in the flow field can be calculated, since most of electrode ablation products exist in the form of copper atoms or copper ions in the high-temperature flow field, the total mass of copper atoms and ions can represent the ablation amount of the electrode, and non-contact real-time measuring of electrode ablation amount can be realized. The on-contact online monitoring method adopts a method of non-contact indirect measurement, the flow field of the arc heating device is not affected, and the response speed is high, and the real-time monitoringof the electrode ablation amount during the entire operation of the arc heating device can be realized.

Description

technical field [0001] The invention belongs to the technical fields of laser measurement technology and equipment safety detection, and in particular relates to a non-contact online monitoring method for electrode ablation of arc heating equipment. Background technique [0002] Arc heating equipment is an important ground equipment for the assessment of heat-resistant materials / systems of hypersonic vehicles. Its operating current reaches thousands of amperes, and the static temperature of the high-temperature flow field of arc plasma generated can reach tens of thousands of Kelvin. Therefore, despite water cooling protection measures, arc heating equipment electrodes are still susceptible to ablation. Once the electrode is ablated and perforated, water leakage is likely to occur, which will cause serious hidden dangers to equipment safety. The electrodes of arc heating equipment are usually made of metal copper. Under high current and high temperature environment, copper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/399
Inventor 陈卫伍越王磊朱涛
Owner 中国空气动力研究与发展中心超高速空气动力研究所
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