Ignition method of double-discharge mode plasma igniter with multi-anode structure

Abstract

The invention discloses an ignition method of a double-discharge mode plasma igniter with a multi-anode structure, and belongs to the field of power, and aims to solve the problem that an existing ignition plug / igniter can be applied to a large-space combustion chamber engine. A long anode and a grounding electrode are insulated by an anode insulation positioning sleeve, so that dielectric barrierdischarge is generated, arc discharge is generated between the grounding electrode and the long anode, a short-anode annular hole and a long-anode open hole are formed in a positioning ring of the insulation positioning sleeve, the lower portion of the short-anode annular hole forms a short-annular groove of a downward closed containing short anode by the aid of an insulation material, space between the long anode and the short-annular groove is hollow, a diameter value of a first diameter value maintenance section is small, a diameter value of a diameter value maintenance section is slightlylarge, so that the space between the inner wall of the grounding electrode and the outer wall of the short-annular groove is hollow, and the hollow and the hollow between the long anode and the short-annular groove sever as first ionization space. By the aid of a dielectric barrier discharge-arc discharge combined discharge mode, lean burn limit of non-equilibrium plasma can be widened, and reaction activity is high.

Description

technical field [0001] The invention belongs to the field of power, and relates to an ignition method of a double-discharge mode plasma igniter with a multi-anode structure. Background technique [0002] As a clean energy, natural gas has been widely used as engine fuel. In the field of vehicle power, the number of passenger cars and heavy-duty vehicles fueled by CNG is increasing; in the field of ship power, CNG and LNG-powered ships have become the key research direction in the "Made in China 2025" plan. Compared with gasoline, natural gas as a gas fuel requires greater ignition energy, which makes it difficult to use a single spark plug to ignite natural gas even for small-bore vehicle natural gas engines in actual use, so gasoline has to be used to ignite the engine. normal work. This has led to a series of problems such as system complexity, cost increase, and reliability decrease. Therefore, it is necessary to adopt a new ignition technology and adopt a relatively s...

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Problems solved by technology

[0005] In order to solve the problem that the existing spark plug / igniter can be applied to large-space combustion chamber engines, and further solve the problems of low ignition energy, poor ignition reliability, and low ignition energy utilization rate when applied to natural gas engines, the present invention proposes the following technical solutions : An ignition method of a double-discharge mode plasma igniter with a multi-anode structure. The short anode and the long anode are powered separately by a power supply, and the ignition is started. The power supply is powered by a lower voltage so that the short anode and the ground electrode are separated by isolation. A dielectric barrier discharge occurs, and the long anode and the ground electrode are separated by the anode insulating positioning sleeve to generate a dielectric barrier discharge, which generates non-equilibrium plasma in the first ionization space, and the dielectric barrier discharge produces flow field disturbance and heating of the gas, which has been The ionized gas moves down to the second ionization space, the power supply voltage rises and only supplies power to the long anode, so that arc discharge occurs between the ground electrode and the long anode, and the mixture gas in the second ionization space rapidly ignites and burns Reaction; the formation method of the first ionization space and the second ionization space: the positioning ring of the insulating positioning sleeve has a short anode ring hole and a long anode hole, and forms a downward closed hole with an insulating material below the short anode ring hole The short ring groove for accommodating the short anode, the limit of the short anode is located in the short ring groove, the short ring groove extends to the first diameter maintenance section of the lower part, and the long anode penetrates through the long anode opening and extends to the exit The short ring groove surrounds the long anode, and there is a hollow space between the long anode and the short ring groove, and the diameter of the first diameter value maintaining segment is smaller than the diameter value maintaining segment, so that the distance between the ground electrode and the inner wall of the short ring groove and the outer wall of the short ring groove It has a hollow, the hollow between the long anode and the short ring groove is used as the first ionization space, the second diameter value maintaining section and the second diameter decreasing section at the lower part, and the hollow between the long anode and the inner wall of the ground electrode forms the second ionization space. ionized space

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