CN-122014456-A - Small valveless pulse jet engine

Abstract

The invention discloses a small valveless pulse jet engine which comprises a combustion chamber, an air inlet, a resonant tube, a tail jet tube and a rectifying ring, wherein the rear end face of the combustion chamber is connected with the air inlet and the resonant tube, the outlet direction of the air inlet faces towards the rear of the engine, the front end of the resonant tube is connected with the combustion chamber, the rear end of the resonant tube is connected with the tail jet tube, and the rectifying ring is arranged at the nozzle of the tail jet tube. The pulse jet engine has the advantages of simple structure, no movable parts, stable working in the flying process and high thrust efficiency.

Inventors

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

Assignees

• 西安现代控制技术研究所

Dates

Publication Date

20260512

Application Date

20260415

Claims (10)

1. 1. A small valveless pulse jet engine is characterized by comprising a combustion chamber, an air inlet, a resonance tube, a tail jet pipe and a rectifying ring; The rear end face of the combustion chamber is connected with the air inlet and the resonance tube; the outlet direction of the air inlet faces to the rear of the engine; The front end of the resonance tube is connected with the combustion chamber, and the rear end of the resonance tube is connected with the tail spray tube; the rectifying ring is arranged at the nozzle of the tail nozzle.
2. 2. A small valveless pulse jet engine according to claim 1, wherein said inlet and outlet nozzle flow paths are of different lengths.
3. 3. The small valveless pulse jet engine of claim 1, further comprising an igniter, wherein the igniter is mountable at any location on the combustion chamber wall.
4. 4. The small valveless pulse jet engine of claim 1, further comprising an oil injection port disposed within the valveless pulse jet engine intake.
5. 5. A small valveless pulse jet engine according to claim 1, wherein the diameter of the air inlet is 0.48 times the diameter of the combustion chamber, the diameter of the resonator tube is 0.5 times the diameter of the combustion chamber, the diameter of the nozzle orifice of the nozzle is 1 to 1.1 times the diameter of the combustion chamber, the length of the air inlet is 2 times the length of the combustion chamber, and the total length of the nozzle orifice is 12 times the diameter of the nozzle orifice.
6. 6. A small valveless pulse jet engine according to claim 1, wherein said valveless pulse jet engine is constructed as a thin wall steel plate welded.
7. 7. A small valveless pulse jet engine according to claim 1, wherein the nozzle is configured in a diverging section, the outlet portion comprising a cylindrical section, the nozzle having a divergence angle of between 1.5 ° and 3 °.
8. 8. The small valveless pulse jet engine according to claim 1, wherein the air inlet is in the form of a cylindrical section, and the inlet portion of the air inlet is an annular air inlet lip or an elliptical annular air inlet lip.
9. 9. A small valveless pulse jet engine according to claim 1, wherein said fairing ring is fan-shaped, arcuate or annular in shape.
10. 10. A small valveless pulse jet engine according to claim 1, wherein said inlet and outlet nozzles are in a single or multiple parallel configuration.

Description

Small valveless pulse jet engine Technical Field The invention belongs to the technical field of aircrafts, and particularly relates to a small valveless pulse jet engine. Background A small valveless 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 the combustion chamber. After the movable parts such as the valve plate are adopted, the service life of the engine is obviously reduced, the reliability is reduced, and the long-term storage and maintenance-free capabilities are not provided. Therefore, when the small valveless pulse jet engine is designed, the requirements of simple structure, convenient use and maintenance and the like are met. The small valveless pulse jet engine is a new engine structural form which is studied at present. According to the combustion principle and the working characteristics of a pulse engine, after pulse combustion, the lengths of an air inlet and an exhaust nozzle are different, the flow rate and the time of sucked air are different, and meanwhile, hot gas in the exhaust nozzle is not completely ejected, flows back to the combustion chamber of the engine and can be combusted secondarily. No performance studies have been made on small valveless pulse jet engines as reported in the present disclosure. Disclosure of Invention The invention provides a small valveless pulse jet engine, which aims to overcome the defects of the prior art and comprises a combustion chamber, an air inlet, a resonant tube, a tail jet tube and a rectifying ring, wherein the rear end face of the combustion chamber is connected with the air inlet and the resonant tube, the outlet direction of the air inlet faces towards the rear of the engine, the front end of the resonant tube is connected with the combustion chamber, the rear end of the resonant tube is connected with the tail jet tube, and the rectifying ring is arranged at the nozzle of the tail jet tube. The pulse jet engine has the advantages of simple structure, no movable parts, stable working in the flying process and high thrust efficiency. The technical scheme adopted for solving the technical problems is as follows: a small valveless pulse jet engine comprises a combustion chamber, an air inlet, a resonance tube, a tail jet pipe and a rectifying ring; The rear end face of the combustion chamber is connected with the air inlet and the resonance tube; the outlet direction of the air inlet faces to the rear of the engine; The front end of the resonance tube is connected with the combustion chamber, and the rear end of the resonance tube is connected with the tail spray tube; the rectifying ring is arranged at the nozzle of the tail nozzle. Preferably, the inlet and outlet nozzle flow paths are of different lengths. Preferably, the valveless pulse jet engine further comprises an igniter, and the igniter can be arranged at any position on the wall surface of the combustion chamber. Preferably, the valveless pulse jet engine further comprises an oil injection port, and the oil injection port is arranged in an air inlet of the valveless pulse jet engine. Preferably, the diameter of the air inlet is 0.48 times of the diameter of the combustion chamber, the diameter of the resonance tube is 0.5 times of the diameter of the combustion chamber, the diameter of the nozzle opening of the tail nozzle is 1-1.1 times of the diameter of the combustion chamber, the length of the air inlet is 2 times of the length of the combustion chamber, and the total length of the tail nozzle is 12 times of the diameter of the tail nozzle. Preferably, the valveless pulse jet engine structure is a thin-walled steel plate welded. Preferably, the outlet portion comprises a cylindrical section, and the divergence angle of the nozzle is between 1.5 ° and 3 °. Preferably, the air inlet structure is in a cylindrical section, and the inlet part of the air inlet is an annular air inlet lip or an elliptical annular air inlet lip. Preferably, the rectifying ring is sector, arc or ring. Preferably, the inlet and outlet nozzles are in a single form or in multiple parallel forms. The beneficial effects of the invention are as follows: the invention can generate stable pulsation combustion and a certain thrust by utilizing the structural relation proportion of the combustion chamber, the air inlet, the resonance tube and the tail jet tube. The engine has the characteristics of simple structure, convenient use and maintenance, high overload resistance, long storage and maintenance-free property. Drawings Fig. 1 is a schematic diagram of a single inlet Shan Penguan valveless pulse jet engine according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a dual inlet single nozzle valveless pulse jet engine according to an embodiment of the present invention. FIG. 3 is a schematic illustration of a valveless pulse jet engine with dual intake and