Combustion chamber of a micro gas turbine with double wall structure

Abstract

The invention discloses a micro combustion chamber with a double-walled structure of a combustion gas turbine. The micro combustion chamber consists of a combustion chamber outer case, a flame barrel outer ring, a flame barrel inner ring, a combustion chamber inner case and the like. The flame barrel outer ring is made of a porous sintered material; the flame barrel inner ring is made of a high-temperature alloy material; and the inner case and the outer case are made of a stainless steel material. After being subjected to diffusion by a diffusion section, high-pressure air enters the combustion chamber in two streams, wherein one stream flows to an outer ring cavity between the flame barrel outer ring and the combustion chamber outer case, and is fixed with fuels to participate in combustion; and the other stream flows to an inner ring cavity between the flame barrel inner ring and the combustion chamber inner case, flows into the flame barrel through mixing holes, and is mixed with head high-temperature fuel gas. The air is divided into streams, so that a working condition close to a stoichiometric ratio is kept in a combustion area of the flame barrel, and therefore, combustion efficiency is improved, and stable working range of the combustion chamber is improved. A flame stabilization way adopting porous medium plane flames is adopted, so that remarkable effect on reducing wall temperature, strengthening stability of the combustion chamber and improving efficiency of the combustion chamber is achieved.

Description

technical field [0001] The invention relates to the technical field of micro-scale combustion, in particular to a combustion chamber of a micro-gas turbine with a double-wall structure. Background technique [0002] In recent years, with the gradual development of Micro-Electro-Mechanical Systems (MEMS) technology, the miniaturization of mechanical structures has become a new trend in technology trends. Micro-devices and their systems, such as sensors, micro-scale aircraft, micro-medical devices, micro-pumps, micro-motors, etc., are widely used in the fields of national defense, scientific research, medical treatment, and industry. In addition, personal portable systems including mobile office and communicator tools are also widely used developed rapidly. For the above-mentioned devices, systems and products, the development of micro-energy systems with small volume, light weight, high energy density and continuous energy supply will have an important impact on their perfor...

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Problems solved by technology

However, compared with the conventional combustion chamber, due to the influence of the scale effect, the micro combustion chamber faces the unfavorable factors of short gas residence time, high heat loss and incomplete combustion, which will make the combustion efficiency of the micro combustion chamber low and the flame stable poor sex

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