Fire damper for secondary detonation-breathing pulse detonation engine

Abstract

The invention discloses a fire damper for a secondary detonation-breathing pulse detonation engine. A body of the fire damper is circular. The front end of the body is planar, and the rear end of the body is spherical. A plurality of circles of same conical holes are arranged on the circle of the body. The conical holes are equal in peripheral spacing. The outer diameter of the body is equal to the inner diameter of a straight barrel of an ejector. The inner diameter of the body is equal to the outer diameter of a pre-detonation tube. The body is mounted at one end of the pre-detonation tube, located at a lip of the ejector. An air channel is formed between the body and the lip of the ejector. Air flowing in from the front end of the fire damper passes maximum sectional areas of the conical holes and decreases along with the sectional areas of the conical holes. Air flowing in from the rear end of the fire damper passes minimum sectional areas of the conical holes first and increases along with the sectional areas of the conical holes, and forward flow resistance is smaller than reverse flow resistance. Forward transmission of high-temperature combustion products in the pulse detonation engine is improved effectively, and operational reliability of the pulse detonation engine is improved.

Description

technical field [0001] The invention relates to the technical field of pulse detonation engines, in particular to a fire baffle for a secondary detonation air-breathing pulse detonation engine. Background technique [0002] The pulse detonation engine is a new concept propulsion device that uses high-temperature, high-pressure gas generated by intermittent detonation waves to generate thrust. According to whether the atmosphere is used as a working medium, it can be divided into an air-breathing pulse detonation engine and a rocket-type pulse detonation engine. Compared with conventional propulsion systems, pulse detonation engines have unique advantages, such as high thermal cycle efficiency, large thrust-to-weight ratio, wide operating range, simple structure, and light weight, especially in two modes of air-breathing and rocket The characteristics of the work are more prominent. [0003] The fire damper used in the secondary detonation air-breathing pulse detonation eng...

AI Technical Summary

Problems solved by technology

Similarly, other pneumatic valves all have the disadvantage of large loss of forward flow resistance, and the above-mentioned pneumatic valves are not suitable for secondary detonation pulse detonation engines

[0004] Patent 201020109153.7 discloses an anti-backflow mechanism for an air-breathing pulse detonation engine. This anti-backflow mechanism for an air-breathing pulse detonation engine is relatively complicated, and there are moving parts in the mechanism, which will reduce the stability of the pulse detonation engine. performance, and the anti-reflux mechanism is not suitable for air-breathing pulse detonation engines with secondary detonation

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