Poppet valve fixing type gas flow adjusting device of solid rocket ramjet

Abstract

The invention discloses a poppet valve fixing type gas flow adjusting device of a solid rocket ramjet. A combustion chamber is connected with a cylindrical hollow valve rod, a poppet valve is connected with the hollow valve rod in a fastened manner through a groove, and two opposite spray pipe holes are formed in the positions, close to the end face, of a cylindrical structure; partial external threads are formed the periphery of a movable spray pipe, the partial external threads are meshed with the internal threads of a fixed base, and three sealing ring grooves are formed in the inner edge of the movable spray pipe; and a stepping motor is fixed below the fixed base through a motor connecting plate, a straight gear is installed on the shaft of the stepping motor through a key, the gear is meshed with a big gear, the big gear and the movable spray pipe are fastened to form a whole, and the spray pipe moves in the direction of the central axis of the fixed base. The poppet valve fixing type gas flow adjusting device of the solid rocket ramjet is simple in structure, accurate to control, reliable in work and low in cost, and is good in realizability.

Description

technical field [0001] The invention belongs to the technical field of gas flow adjustment for solid rocket ramjet engines, in particular to a gas flow adjustment device for solid rocket ramjet engines with fixed cone valves. Background technique [0002] The solid rocket ramjet has the advantages of both ramjet and rocket engines, and has the advantages of high specific impulse, small size, light weight, compact structure, reliable operation, and low cost. In order to ensure that the engine has the best working performance and good thrust adjustment capability, the gas flow of the solid rocket ramjet should be adjusted. At present, there are four main schemes for gas flow regulation: fixed flow type, choke type, non-choke type and swirl valve type. Flow regulating valves usually adopt a variety of configurations, such as plunger spool valve, rotary cam valve, rotary slide disc valve, and cone valve. The transmission mechanisms used in traditional control systems generally...

AI Technical Summary

Problems solved by technology

Although the structure is simple and the response speed is fast, it needs to add a gas source device, which occupies a large space. Since the gas is prone to leakage, it is not easy to achieve precise control in the process of adjusting the gas flow.

Wang Yilin of Northwestern Polytechnical University proposed a non-coaxial needle-valve gas flow regulation system with a 90-degree angle between the nozzle and the combustion chamber. Although the throat plug rod is easy to seal and thermal protection is easy to achieve, the experimental system is large and cannot achieve precise control.

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