A Method of Measuring the Combustion Chamber Temperature of Hydrogen Fluoride Laser Using Trace Hydrogen Method
A technology of trace hydrogen and hydrogen fluoride, applied in electric radiation detectors, instruments, special data processing applications, etc., can solve complex problems, increase the temperature of the main airflow, and give downstream static temperature, etc.
Active Publication Date: 2018-04-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0023] However, although the gas temperature T in the optical cavity cav It is easy to obtain, but when the hydrogen fluoride chemical laser operates under normal working conditions, the gas temperature T in the optical cavity cav It is not equal to the downstream static temperature T. On the one hand, the chemical reaction between fluorine atoms and hydrogen molecules will release a large amount of heat, which will cause the temperature of the main airflow to rise; on the other hand, hydrogen has a large heat capacity and will absorb part of the heat.
The combination of these two aspects is very complicated, so it is difficult to calculate according to the gas temperature T in the optical cavity cav Given the downstream static temperature T
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Embodiment 1
[0042] An example of measuring the combustion chamber temperature of a hydrogen fluoride laser using the trace hydrogen method.
[0043] The specific operation steps are as follows:
[0044] The first step is to open the gate valve, vacuumize, and carry out the HF chemical laser experiment without light, that is, only perform the F+H2 chemical reaction to emit fluorescent radiation; but without the cavity mirror, there will be no laser.
[0045] The gas flow rate (mmol / s) at the inlet of the combustion chamber is: D 2 (114),NF 3 (125), He (81).
[0046] It should be noted that the amount of hydrogen added is much smaller than that in normal experiments, ensuring that F+H 2 The chemical reaction exotherm does not affect the main gas flow temperature; H 2 The flow rate was set at 3 mmol / s.
[0047] The second step is to estimate the specific heat ratio γ of each gas mixture in the combustion chamber.
[0048] NF 3 After pyrolysis into N 2 and F atoms, F atoms and D 2 Th...
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The invention relates to a method for measuring the temperature of the combustion chamber of a hydrogen fluoride laser by using the trace hydrogen method, which is based on gas dynamics technology and spontaneous emission fluorescence spectrum technology. temperature. The invention is mainly applied in the technical field of hydrogen fluoride chemical laser testing and diagnosis, and can measure the temperature of the hydrogen fluoride laser combustion chamber by an optical method under the condition that the combustion chamber has no observation window. The invention utilizes the trace hydrogen injection technology to reduce the influence of the heat release from the chemical reaction of hydrogen and fluorine atoms on the temperature of the main airflow flowing out of the combustion chamber. The invention has the characteristics of simplicity, convenience, intuition and accuracy, non-invasiveness and the like.
Description
technical field [0001] The invention relates to a method for measuring and diagnosing a hydrogen fluoride chemical laser. In the optical cavity, use the method of trace hydrogen injection to measure the temperature T of the optical cavity airflow after the combustion chamber airflow passes through the nozzle expansion cav , and then according to the knowledge of aerodynamics, the combustion chamber temperature T can be obtained 0 . The invention can realize the use of non-invasive optical measurement technology to obtain the temperature T of the combustion chamber under the condition that the combustion chamber has no observation window 0 . Background technique [0002] Since the first chemical laser came out in 1964, the development of chemical lasers has been advancing by leaps and bounds, and the speed is amazing. Among them, the development of hydrogen fluoride chemical lasers is the most mature. The American Alph hydrogen fluoride chemical laser with continuous wave ...
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IPC IPC(8): G06F19/00G01J5/10
Inventor 李留成多丽萍金玉奇唐书凯李国富王元虎于海军汪健曹靖康元福
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI