Micro-combustor

Abstract

The invention discloses a micro-combustor, which comprises a bluff body, two preheating channels and a combustion chamber, wherein the preheating channels and the combustion chamber are all plate-shaped; the cross section of the bluff body is triangular or circular; the bluff body is arranged at an inlet of the combustion chamber; the ratio of the width of the bluff body to the width of the combustion chamber is 0.3-0.6; the two preheating channels are both L-shaped and are respectively arranged at upper and lower sides of the combustion chamber; and outlets of the preheating channels are both communicated with the inlet of the combustion chamber. By using the micro-combustor, the defect of the prior art is overcome. By preheating and catalyzing fuels and air (when a non-pre-mixing combustion mode is adopted) or the pre-mixture of the fuels and air (when a pre-mixing combustion mode is adopted), the energy used for igniting is lowered, the igniting delay time is shortened and the exhaust heat loss is reduced. Besides, a low-speed high-temperature recirculation region formed behind the bluff body is utilized to fully mix the fuels and air, prolong the gas retention time and stabilize the flame. The micro-combustor can be used for efficiently expanding the stable combustion limit and increasing the combustion efficiency and can be widely applied to various micro-power systems.

Description

technical field [0001] The invention belongs to the technical field of gas combustion, in particular to a burner for providing a heat source or a high-temperature gas source for a miniature power device. Background technique [0002] With the rapid development of micromachining technology, various microelectromechanical systems and devices are emerging, such as microsatellites, micropropulsion systems, microrobots, and portable electronic devices such as mobile phones. At present, most of these devices are driven by chemical batteries. However, chemical batteries have disadvantages such as low energy density, large volume and weight, and long charging time. Compared with chemical batteries, hydrogen and hydrocarbon fuels have energy densities that are dozens of times higher. For example, the energy density of a typical liquid hydrocarbon fuel is about 45MJ / kg, while the energy density of the best lithium battery is about 1.2MJ / kg. Therefore, combustion-based micro-miniature...

AI Technical Summary

Problems solved by technology

But the complex three-dimensional structure of this burner makes its machining very difficult

In addition, Zhong Jingjing et al. have proposed a miniature catalytic burner, however, the catalytic effect of the catalyst is not durable

The research team in Singapore has developed a sudden expansion micro-burner with steps to stabilize the flame, which has achieved certain results, but it increases the complexity of system processing, and the existence of steps reduces the compactness of the burner.

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