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

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...

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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

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