Dual-cavity annular micro burner based on Swiss roll structure

Abstract

The invention belongs to the technical field of micro scale power generation, and particularly discloses a dual-cavity annular micro burner based on a Swiss roll structure. The micro burner comprisesa first burning structure and a second burning structure; the first burning structure comprises a first air inlet passage, a first rectification cavity, a first burning chamber and a first air outletpassage which communicate with each other in sequence; the second burning structure comprises a second air inlet passage, a second rectification cavity, a second burning chamber and a second air outlet passage which communicate with each other in sequence; the first burning chamber and the second burning chamber are inversely and symmetrically arranged on the upper side and the lower side of the center of the micro burner, so an inlet end of the first burning chamber is adjacent to an outlet end of the second burning chamber and an outlet end of the first burning chamber is adjacent to an inlet end of the second burning chamber; and the first air inlet passage is adjacent to the second air outlet passage and the first air outlet passage is adjacent to the second air inlet passage. Throughthe arrangement of dual burning cavities which are inversely and symmetrically arranged and an annular pre-heating passage, energy required for ignition can be lowered, ignition delay duration is shortened, and the inlet speed is increased.

Description

technical field [0001] The invention belongs to the technical field of micro-scale power generation, and more specifically relates to a double-chamber annular micro-combustor based on a Swiss roll structure. Background technique [0002] Combustion of hydrocarbon fuels at the microscale greatly facilitates the application of microelectromechanical systems. The characteristic size of the micro-power system is usually between a few millimeters and a few centimeters. The chemical energy of the fuel is converted into heat energy through the combustion chamber, and then mechanical energy is generated for power generation, and finally electric energy is output. [0003] However, the current micro-combustion faces the following problems: (1) The residence time of the fuel is short - as the characteristic length scale of the burner decreases, the high flow rate makes the residence time of the fuel shorten, especially when the residence time of the components When approaching the ch...

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Problems solved by technology

[0003] However, the current micro-combustion faces the following problems: (1) The residence time of the fuel is short - as the characteristic length scale of the burner decreases, the high flow rate makes the residence time of the fuel shorten, especially when the residence time of the components When approaching the characteristic combustion time, the incomplete combustion of the fuel reduces the heat release and increases the heat loss, which makes it difficult for the flame to sustain itself, and even flameout occurs

(2) Large heat loss - the high specific surface area of ​​the micro-burner causes serious heat loss, and it is prone to hot eaves fire and free radical fire

(3) Low combustion efficiency - the residence time of chemical reaction components is short, which is basically the same order of magnitude as the chemical reaction time of hydrocarbons / air, which easily leads to low combustion efficiency

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