Method for nanosecond laser to induce plasma to improve stable combustion limit of gas hydrocarbon fuel and device for achieving method

A plasma and laser-induced technology, which is applied in the direction of using plasma, thrust reverser, machine/engine, etc., can solve the problems of unstable combustion, easy flame blowout, etc., reach the limit of extended stability, not easy to blow out, and improve combustion efficiency effect

Active Publication Date: 2013-10-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of unstable combustion and easy blow-out of the flame existing in the existing air velocity supercritical combustion system, thereby providing a method for increasing the stable combustion limit of gaseous hydrocarbon fuel by nanosecond laser-induced plasma and realizing the method method device

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  • Method for nanosecond laser to induce plasma to improve stable combustion limit of gas hydrocarbon fuel and device for achieving method

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specific Embodiment approach 1

[0018] Specific implementation mode 1. Combination figure 1 Illustrate this specific embodiment, the method that nanosecond laser-induced plasma improves the stable combustion limit of gaseous hydrocarbon fuel, it is realized by the following steps:

[0019] Step 1. Pass the mixed combustible gas in the premix tank into the quartz tube, and ignite the mixed gas at the mouth of the quartz tube to form a Bunsen burner flame, and make the flow rate of the mixed combustible gas in a supercritical state;

[0020] Step 2. Using a nanosecond laser to emit a laser beam, and focusing the nanosecond laser beam on the unburned area of ​​the mixed combustible gas described in step 1, inducing the mixed combustible gas to generate plasma, thereby improving the flame stability limit.

[0021] The mixed combustible gas described in the first step is one of the mixed gas of methane and air, the mixed gas of methane, nitrogen and oxygen.

specific Embodiment approach 2

[0022] Specific embodiment two, realize the device that the nanosecond laser-induced plasma described in specific embodiment one improves the stable combustion limit of gaseous hydrocarbon fuel, it comprises N 2 Cylinder 4, O 2 Cylinder 5, CH 4 Gas bottle 6, premix tank 7, quartz tube 9, Nd:YAG laser 10, mirror 11, beam splitter 12 and lens 13;

[0023] N 2 The gas outlet of gas cylinder 4 and the N of premix tank 7 2 The air inlet is connected; the O 2 The gas outlet of cylinder 4 and the O of premix tank 7 2 Inlet communication; the CH 4 The gas outlet of gas cylinder 4 and the CH of premix tank 7 4 The air inlet is connected; the gas outlet of the premix tank 7 is connected with the end of the quartz tube 9;

[0024] The laser light that Nd:YAG laser device 10 produces is reflected to spectroscope 12 by reflector 11, is divided into reflected light and transmitted light through spectroscope 12; Described No. 1 reflected light is emitted to the outside; Transmitted li...

specific Embodiment approach 3

[0026] Specific embodiment three, the difference between this specific embodiment and the nanosecond laser-induced plasma described in specific embodiment two to improve the stable combustion limit of gaseous hydrocarbon fuels is that it also includes a focusing telescope 16 and an ICCD15. The light produced by the flame of the lamp is imaged on the ICCD15 through the focusing telescope 16.

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Abstract

The invention discloses a method for a nanosecond laser to induce plasma to improve a stable combustion limit of gas hydrocarbon fuel and a device for achieving the method, and relates to the method for improving the stable combustion limit of the gas hydrocarbon fuel and the device for achieving the method. The problems that in an existing combustion system with supercritical airflow velocity, combustion is not stable, and flames are easy to blow out are solved. The method comprises the steps of filling mixed combustible gas in a pre-mixing pot in a quartz tube, igniting the mixed gas at the mouth of the quartz tube, forming a Bunsen burner flame, enabling the flow velocity of the mixed combustible gas to be in a supercritical state, adopting the nanosecond laser to emit laser beams, focusing the laser beams of the nanosecond laser on a non-combustion area of the mixed combustible gas, inducing the mixed combustible gas to generate the plasma, and achieving the improvement of the stable limit of the flame. According to the device, the air outlet of the pre-mixing pot is communicated with the tail end of the quartz tube, and lasers generated by an Nd:YAG laser are focused on the gas outlet of the quartz tube. The method for the nanosecond laser to induce the plasma to improve the stable combustion limit of the gas hydrocarbon fuel and the device for achieving the method are suitable for improving the stable combustion limit of the gas hydrocarbon fuel.

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] Plasma-supported combustion is to promote the combustion oxidation process by ionizing, dissociating or exciting fuel and oxidant into active molecules, atoms, free radicals and molecular fragments, so as to improve the combustion speed and combustion efficiency. 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, in order to achieve stable combustion in supercritical gas flow, flame stabilization technology is essential. Hypersonic vehicles use scramjet engines as their power systems. The airflow speed of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03H1/00
Inventor 于欣李晓晖刘倡彭江波于杨樊荣伟陈德应
Owner HARBIN INST OF TECH
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