A method for synergistic suppression of combustion pressure pulsation by high-frequency excitation discharge center plasma and side plasma

A plasma and high-frequency excitation technology, applied in the direction of plasma and electrical components, can solve the problems of insufficient operating frequency, mechanical loss, large operating time delay, etc., to achieve stable flame shape, pressure pulsation suppression, thermoacoustic The effect of reducing the oscillation phenomenon

Active Publication Date: 2021-06-29
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problems of insufficient actuation frequency, large actuation time delay and mechanical loss in the existing method for suppressing combustion pressure pulsation, and provides a high-frequency excitation discharge central plasma and side plasma to jointly suppress combustion pressure pulsation method

Method used

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  • A method for synergistic suppression of combustion pressure pulsation by high-frequency excitation discharge center plasma and side plasma
  • A method for synergistic suppression of combustion pressure pulsation by high-frequency excitation discharge center plasma and side plasma
  • A method for synergistic suppression of combustion pressure pulsation by high-frequency excitation discharge center plasma and side plasma

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specific Embodiment approach 1

[0017] Specific implementation mode 1: This implementation mode is a method for coordinating the suppression of combustion pressure pulsation by high-frequency excitation discharge center plasma and side plasma, which is specifically carried out according to the following steps:

[0018] Place the metal electrode at the center of the entrance of the combustion chamber, place the ring-shaped DBD electrode on the side wall of the combustion chamber in a circle and at a height around the flame, and connect the metal electrode to the output end of the first power supply outside the combustion chamber. The ring-shaped DBD electrode is connected to the output end of the second power supply outside the combustion chamber, and the combustible premixed gas is introduced into the combustion chamber and ignited. When thermoacoustic oscillation occurs in the combustion chamber and accompanied by a certain degree of pressure pulsation, the external combustion chamber is activated. The first...

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that the metal electrode is a metal suspension single electrode, and the lower end of the metal suspension single electrode is connected to the output end of the first power supply outside the combustion chamber. Others are the same as the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the metal electrode is a metal double electrode, and a pair of metal double electrodes are installed near the root of the flame in an opposite arrangement. Each electrode is respectively connected with the output terminal of the first power supply outside the combustion chamber and the ground wire. Others are the same as those in Embodiment 1 or 2.

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Abstract

A method for suppressing combustion pressure pulsation by high-frequency excitation discharge center plasma and side plasma synergistically relates to a method for suppressing pressure pulsation in thermoacoustic oscillation phenomenon. In the present invention, the central plasma and the side plasma are coordinated as a dynamic and active way to regulate the pressure pulsation state in the combustion process of the combustion chamber. The invention generates plasma at the flame root and side of the combustion chamber, and the root plasma dynamically affects the frequency and phase law of the heat release of the flame, so that the response degree of the pulsating flame to the airflow disturbance changes; the plasma applied on the flame side passes a certain amount of energy Input the main body of the adsorption flame, and change the distance between the flame main heat release zone and the outlet of the combustion chamber, that is, the length of the return path reflected by the pressure pulsation in the combustion chamber from the outlet of the combustion chamber changes, and the phase difference between the pressure pulsation and the heat release rate of the flame changes; The plasma coordinates and adjusts to slow down or suppress the combustion pressure pulsation.

Description

technical field [0001] The invention relates to a method of suppressing combustion pressure pulsation. Background technique [0002] Under certain operating conditions, some unexpected instability will occur inside the combustion chamber, that is, when the relative phase between the sound pressure and the unsteady heat release is between +90° and -90°, the combustion system Energy will be amplified. If this amplified energy is greater than the energy dissipated at the chamber boundary, the average net energy accumulated over one oscillation cycle of the chamber increases and eventually leads to the occurrence of thermoacoustic oscillation phenomena. On the one hand, this instability phenomenon can promote the mixing of fuel-air, enhance the mixing effect, and facilitate the combustion; but on the other hand, it will cause additional pressure, high-amplitude oscillation of the flow field and flame, heat load As the height increases, the generation of pollutants will intensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H1/26
CPCH05H1/26
Inventor 唐井峰郭宸杨广薇于达仁
Owner HARBIN INST OF TECH
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