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Femtosecond laser-induced plasma method for increasing gaseous hydrocarbon fuel stability limit and device for realizing the method

A femtosecond laser and plasma technology, applied in the direction of using plasma, thrust reverser, machine/engine, etc., can solve the problems of easy extinguishment of flame, unstable combustion, etc., achieve high peak power, expand stability limit, and improve stability sexual effect

Inactive Publication Date: 2011-12-21
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of unstable combustion and easy extinguishment of flames existing in the existing air velocity supercritical combustion system, thereby providing a method for improving the stable combustion limit of gaseous hydrocarbon fuel by femtosecond laser-induced plasma and realizing the method installation

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  • Femtosecond laser-induced plasma method for increasing gaseous hydrocarbon fuel stability limit and device for realizing the method
  • Femtosecond laser-induced plasma method for increasing gaseous hydrocarbon fuel stability limit and device for realizing the method

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specific Embodiment approach 1

[0018] The specific embodiment one, femtosecond laser-induced plasma improves the method for gaseous hydrocarbon fuel stable burning limit, and it is realized by the following steps:

[0019] Step 1. Pass the mixed gas into the quartz glass circular tube, and ignite the mixed gas at the nozzle of the quartz glass circular tube to form a Bunsen burner flame, and make the speed of the mixed gas supercritical; the mixed gas It is a mixture of oxygen, nitrogen and combustible gases;

[0020] Step 2, using a femtosecond laser to emit a femtosecond laser beam, and focusing the femtosecond laser beam on the unburned area of ​​the mixed gas described in step 1, inducing the mixed gas to generate plasma, so as to improve the flame stability limit.

specific Embodiment approach 2

[0021] Embodiment 2. The difference between this embodiment and the femtosecond laser-induced plasma method described in Embodiment 1 to improve the combustion stability limit of gaseous hydrocarbon fuels is that the combustible gases described in step 1 are methane, propane and acetylene one or a combination of several.

specific Embodiment approach 3

[0022] Embodiment 3. The difference between this embodiment and the femtosecond laser-induced plasma method described in Embodiment 1 to improve the combustion stability limit of gaseous hydrocarbon fuels is that the mixed gas described in step 1 is oxygen, nitrogen and methane The volume percentage of the methane ranges from 4.8% to 18.8%; the volume percentage of oxygen ranges from 16.9% to 21.8%; and the volume percentage of nitrogen ranges from 62.5% to 75.8%.

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Abstract

The invention discloses a method for increasing the stable combustion limit of gaseous hydrocarbon fuels by femtosecond laser-induced plasma and a device for realizing the method, relating to a method for improving the stable combustion limit of gaseous hydrocarbon fuels and a device for realizing the method. It solves the problems of unstable combustion and easy extinguishment of flames existing in the existing air velocity supercritical combustion system. Method: ignite the mixed gas at the nozzle of the quartz glass circular tube to form a Bunsen burner flame, and make the speed of the mixed gas supercritical; use a femtosecond laser to emit a femtosecond laser beam, and turn the femtosecond laser The beam is focused on the unburned area of ​​the mixed gas to induce the mixed gas to generate plasma, so as to improve the flame stability limit. Device: The gas outlet of the gas mixing tank is connected to the inlet of the quartz glass circular tube; a flame is generated at the top of the quartz glass circular tube, and the femtosecond laser beam generated by the femtosecond laser is focused on the unburned area of ​​the mixed gas. The invention can be widely used in the design of combustion systems with various supercritical airflow speeds.

Description

technical field [0001] The invention relates to a method for increasing the stable combustion limit of gaseous hydrocarbon fuels and a device for realizing the method. Background technique [0002] In recent years, with the increasingly urgent demand for energy saving and emission reduction and supersonic and hypersonic vehicles in the aerospace field have become the mainstream development direction, the development of supercritical combustion systems with various airflow velocities has become a mainstream trend. However, to achieve stable combustion in supercritical gas flow, flame stabilization technology is essential. Traditional flame stabilization techniques include watch flames, support plates, and swirling airflows. The duty flame transfers energy, mainly in the form of heat, to the airflow of the combustion system, thereby achieving flame stabilization. This method will significantly increase the temperature of the airflow in the system, which is not conducive to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03H1/00
Inventor 于欣孙锐彭江波杨晓川陈德应刘辉伊亚超王春红孙军
Owner HARBIN INST OF TECH
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