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Water leakage amount measurement method in case of water leakage fault of arc heater

An arc heater and fault-time technology, which is applied in the field of water leakage measurement when the arc heater has a water leakage fault, can solve problems such as inability to evaluate the water leakage, inability to determine the electrode water leakage fault, etc., and achieves a low degree of environmental dependence, low cost, and a test system. simple effect

Active Publication Date: 2016-12-07
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

The early copper particle concentration mainly relied on weighing method, emission spectroscopy and direct measurement of plug-in probes. NASA-Ames Center Ronald et al. cooperated with Stanford University to study the arc flow field parameter test sensor based on tunable diode laser absorption spectroscopy technology. , using a laser with a central wavelength of 793.3nm to measure the concentration of copper particles in the flow field and the temperature of the airflow, the results show that under the condition of a total arc power of 6.8MW, the average content of copper particles in the flow field is 2ppm, while under the condition of 20MW, copper particles The particle content is as high as 13ppm. Absorption spectroscopy technology can promptly and quickly diagnose the composition of the flow field, and can provide useful information for when the arc heater is normally maintained. There is no necessary connection, and it cannot be directly used to determine the leakage of the electrode, and it is powerless to evaluate the amount of water leakage

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  • Water leakage amount measurement method in case of water leakage fault of arc heater
  • Water leakage amount measurement method in case of water leakage fault of arc heater
  • Water leakage amount measurement method in case of water leakage fault of arc heater

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0029] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0030] Take the 60MW laminated heater as an example, such as figure 1 and figure 2 As shown, a water leakage measurement method for an arc heater leakage fault includes: an arc heater 1 , a nozzle 2 , a spectral measurement clip 3 , a window 4 , a lens 5 , an optical fiber 6 and a spectral measurement system 7 . The test was carried out in the arc wind tunnel. The arc heater 1 and the nozzle 2 were used to provide the aerodynamic heating environment acting on the test model. The spectral measurement clip 3, the window 4, the lens 5 and the optical fiber 6 were used to collect and...

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Abstract

The invention provides a water leakage amount measurement method in case of a water leakage fault of an arc heater. The method comprises the following steps: obtaining spectrum information of a high-temperature high-speed gas, according to the spectrum information, obtaining an intensity ratio I<H> / I<O> of a hydrogen atom feature spectral line lambda <H>=656.28nm to an oxygen atom feature spectral line lambda <O>=777.19nm through calculation; and based on thermodynamic balance conditions, according to the intensity ratio I<H> / I<O> and a known oxygen atom number density no, obtaining an hydrogen atom number density nH through calculation, and according to n<H2O>=2n<H>, obtaining a water leakage amount through calculation. On one hand, the burning damage degree of the heater can be monitored through real-time change of the water leakage amount, and on the other hand, the arc heater can be rapidly shut down in case of water leakage can also be realized through linkage with a control system. The method is more accurate and direct than a conventional method and makes up for the technical blank of difficult quantitative measurement of the water leakage amount of the heater in case of the water leakage fault at home and abroad at present. The method is simpler, the cost is low, the reliance on environment is small, the method can be conveniently realized in arc heaters and arc wind tunnels, and the system reliability is higher.

Description

technical field [0001] The invention belongs to the research field of ground aerodynamic thermal tests of aircraft, and in particular relates to a method for measuring water leakage when an arc heater leaks and fails. Background technique [0002] The arc heater is an important test platform for studying aerodynamic thermal protection problems. Since the 1950s, it has been the first choice for ground assessment and testing of aircraft thermal protection systems. With the development of new aircraft in the future, the power of the arc heater and the enthalpy of the gas to be heated are also continuously increased, and the increase in the power of the arc heater is inevitably related to the increase in current. Due to the huge heat flow loaded on the electrode in the test, the ablation of the arc heater electrode is bound to be caused, and the increase of the current directly leads to the aggravation of the electrode burning. In order to prolong the life of the arc heater ele...

Claims

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Application Information

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IPC IPC(8): G01M3/04G01N21/71
CPCG01M3/04G01N21/71
Inventor 林鑫陈连忠欧东斌
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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