CN-122014455-A - Pulse jet engine with double-layer combustion chamber

Abstract

The invention discloses a pulsation jet engine with a double-layer combustion chamber, which consists of the double-layer combustion chamber, an air inlet channel, a tail pipe, an oil nozzle and the like. The engine combustion chamber adopts a double-layer structure, the inner wall surface is of a main structure of the engine combustion chamber, the volume of the engine combustion chamber is controlled, and the main combustion temperature of the engine is born. A certain space is isolated between the outer layer wall surface and the inner layer wall surface. The intermediate space may be evacuated or filled with a nonmetallic material that is resistant to high temperatures and has a low thermal conductivity. The pulsation engine of the double-layer combustion chamber has the advantages that the heat loss of the wall surface of the engine can be reduced in the starting and working processes of the engine, the gas temperature in the combustion chamber is improved, the propulsion efficiency of the engine is improved, the working environment boundary of the engine is widened, and the infrared stealth performance is effectively improved.

Inventors

• LIU JIANGUO
• WANG HANGZHOU
• FU YONG
• HU ZHIXI
• DENG HENG
• CHEN GANG
• Ye Sijuan
• LI HAICHENG
• XIONG QINGRONG
• LI HONGCAI
• LU WEI
• FENG YUHONG

Assignees

• 西安现代控制技术研究所

Dates

Publication Date

20260512

Application Date

20260413

Claims (9)

1. 1. The pulse jet engine with the double-layer combustion chamber is characterized by comprising the double-layer combustion chamber, an oil nozzle, an air inlet and a tail pipe, wherein the double-layer combustion chamber comprises an inner layer wall surface, an outer layer wall surface and an intermediate layer; the rear end face of the double-layer combustion chamber is connected with an air inlet and a tail pipe, and the outlet directions of the air inlet and the tail pipe face to the rear of the engine; The oil nozzle is arranged in the double-layer combustion chamber; The middle layer is arranged between the inner layer wall surface and the outer layer wall surface; the intermediate layer is made of vacuum or filled nonmetallic materials.
2. 2. The pulse jet engine of claim 1, wherein said nonmetallic material is a high temperature resistant, low thermal conductivity nonmetallic material.
3. 3. A pulse jet engine with a dual layer combustion chamber as defined in claim 2, wherein said non-metallic material with high temperature resistance and low thermal conductivity is mullite needled felt.
4. 4. A pulse jet engine with a double-layer combustion chamber according to claim 3, wherein the mullite needled felt has a normal temperature thermal conductivity of not more than 0.15W/(m.k), a 600 ℃ thermal conductivity of not more than 0.38W/(m.k), and a high temperature resistance of not less than 1300 ℃.
5. 5. A pulse jet engine with a dual layer combustion chamber as defined in claim 2, wherein said high temperature resistant, low thermal conductivity nonmetallic material is a zirconium-containing ceramic fiber blanket.
6. 6. A pulse jet engine with a double layer combustion chamber as claimed in claim 1, wherein the thickness of the middle layer is 2-5mm.
7. 7. The pulse jet engine of claim 1, further comprising an ignition device, wherein the ignition device is mountable at any location on the inner wall of the dual layer combustion chamber.
8. 8. A pulse jet engine with a dual layer combustion chamber as defined in claim 1, wherein said dual layer combustion chamber is circular in cross section.
9. 9. A pulse jet engine with a dual layer combustion chamber as defined in claim 1, wherein said dual layer combustion chamber has an elliptical cross section.

Description

Pulse jet engine with double-layer combustion chamber Technical Field The invention belongs to the technical field of aircrafts, and particularly relates to a pulse jet engine with a double-layer combustion chamber. Background A pulse jet engine is a power plant in a jet engine. The pulse jet engine disclosed at home and abroad mainly adopts a valve plate or a diaphragm to control the air inlet of a combustion chamber. After the valve structure adopts movable parts such as valve plates, the service life of the engine is obviously reduced, the reliability is reduced, and the valve structure does not have the capability of long-term storage and maintenance-free. In the structural design of the valveless pulse jet engine, only whether the engine can normally start and normally work is considered, and whether the structural size is reasonable is not conducted in deep study on the performance and the thermal efficiency of the valveless pulse jet engine. The pulse jet engine works by means of pressure change of self pulse combustion to perform cyclic work such as air suction, compression, air discharge and the like. However, the internal temperature of the combustion chamber of the engine is as high as 2000K, and the wall temperature of the combustion chamber is also approximately 1100K. Because of the high wall temperature, the heat loss of the engine is serious, not only the improvement of the heat efficiency is restricted, but also the working cycle reliability of the pulsating combustion of the engine is affected. Therefore, how to effectively and rapidly improve the working reliability and the working performance of the pulse engine is one content of the research of the pulse engine, and is also a problem to be solved in engineering application. Pulse jet engines with double-layer combustion chambers are a new engine structural form which is studied at present. The pulse jet engine has the advantages that the pulse jet engine is based on the combustion principle and the working characteristics of the pulse jet engine, the pulse combustion is generated in the combustion chamber by utilizing the structures of different lengths of the air inlet and the tail pipe, and the high-speed hot fuel gas is discharged through the tail pipe to generate thrust. The combustion chamber adopts a double-layer structure, and the rest structures are similar to those of a conventional pulse jet engine. The present disclosure reports pulse jet engines without a dual-layer combustion chamber. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides a pulse jet engine with a double-layer combustion chamber, which consists of the double-layer combustion chamber, an air inlet channel, a tail pipe, an oil nozzle and the like. The engine combustion chamber adopts a double-layer structure, the inner wall surface is of a main structure of the engine combustion chamber, the volume of the engine combustion chamber is controlled, and the main combustion temperature of the engine is born. A certain space is isolated between the outer layer wall surface and the inner layer wall surface. The intermediate space may be evacuated or filled with a nonmetallic material that is resistant to high temperatures and has a low thermal conductivity. The pulsation engine of the double-layer combustion chamber has the advantages that the heat loss of the wall surface of the engine can be reduced in the starting and working processes of the engine, the gas temperature in the combustion chamber is improved, the propulsion efficiency of the engine is improved, the working environment boundary of the engine is widened, and the infrared stealth performance is effectively improved. The technical scheme adopted for solving the technical problems is as follows: a pulse jet engine with a double-layer combustion chamber comprises the double-layer combustion chamber, an oil nozzle, an air inlet and a tail pipe, wherein the double-layer combustion chamber comprises an inner layer wall surface, an outer layer wall surface and an intermediate layer; the rear end face of the double-layer combustion chamber is connected with an air inlet and a tail pipe, and the outlet directions of the air inlet and the tail pipe face to the rear of the engine; The oil nozzle is arranged in the double-layer combustion chamber; The middle layer is arranged between the inner layer wall surface and the outer layer wall surface; the intermediate layer is made of vacuum or filled nonmetallic materials. Preferably, the nonmetallic material is a nonmetallic material with high temperature resistance and low heat conductivity coefficient. Preferably, the nonmetallic material with high temperature resistance and low heat conductivity coefficient is mullite needled felt. Preferably, the mullite needled felt has normal temperature heat conductivity less than or equal to 0.15W/(m.k), 600 ℃ heat conductivity less than or equal to 0.38W/(m.k) and high temperature