A Mechanical Valve for Reducing Intake Backpressure of Air-breathing Pulse Detonation Engine

Abstract

The invention discloses a mechanical valve for reducing reverse pressure of an air inlet passage of an air-breathing pulse detonation engine. The mechanical valve consists of three parts including a Venturi, an air inlet cover and an elastic leaf spring, wherein the air inlet cover is fixedly arranged in a straight pipe section of the Venturi and is tightly matched with the straight pipe section of the Venturi. A plurality of rectangular air inlet holes are formed in the circumference direction of the front section of the inner ring wall of the cylindrical ring-shaped air inlet cover at equal intervals, a plurality of lug bosses corresponding to the air inlet holes are arranged at the back section of the inner ring section of the air inlet cover, threaded holes are formed in the centers of the lug bosses, the elastic leaf springs are fixedly arranged on the lug bosses through screws, and the elastic leaf springs generate bending deformation to shield the air inlet holes under the effect of pneumatic force or bend to the axis. The mechanical valve has the advantages that the mixing of fuel and air can be accelerated, the mixing distance can be effectively reduced, the length of the engine is reduced, in addition, the circulation area can be reduced during the pressure reverse transmission, the flow rate and the pressure of the fuel gas transmitted back to the air inlet passage are reduced, the air-breathing pulse detonation engine can favorably realize stable work, and the propelling performance is improved.

Description

technical field [0001] The invention belongs to the field of pulse detonation engines, and in particular relates to a mechanical valve for reducing the back pressure of an intake port of an air-breathing pulse detonation engine. Background technique [0002] The air-breathing pulse detonation engine is a new concept propulsion device that uses high-temperature, high-pressure gas generated by intermittent detonation waves to generate thrust. The air-breathing pulse detonation engine generates detonation waves periodically, and fresh air must also be periodically filled into the detonation chamber, so its air inlet cannot be completely closed. According to whether there is a mechanical valve in the intake duct, the intake duct of the air-breathing pulse detonation engine can be divided into two types of intake ducts: mechanical valve type and pneumatic valve type. [0003] In a working cycle, before the detonation wave is formed, several local high-temperature and high-pressu...

AI Technical Summary

Problems solved by technology

However, due to the high pressure in the detonation chamber, researchers still need to do a lot of work in order to completely prevent the reverse transmission of gas by means of pneumatic valves.

[0004] In the prior art, most of the measures taken to reduce the back pressure of the intake port are carried out in the intake port, and there are few public structures for reducing the back pressure after the intake port, such as the ignition chamber or the detonation chamber

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