A shelling valve with reduced fluid resistance

Abstract

The invention belongs to the field of underwater launching, and in particular relates to a shelling valve for reducing fluid resistance. The shelling flap is composed of 4 flaps fastened by an annular elastic belt. It is divided into a front-end circular platform section and a rear-end cylindrical section. The front end of the circular platform has an inclination angle. The rear end of the shelling flap has an inclination angle; the diameter D1 of the front end of the shelling flap is determined by the diameter D of the cavity formed by the projectile on the front face of the flap, and D1 is 2 to 3 mm larger than D. The shelling flap provided by the present invention, when the flap is out of the chamber, the water flow impacts on the front end face of the round platform, and the front face becomes a cavitator of the flap, forming a cavity that can wrap the flap, reducing the front face of the flap More than 40% of the force-bearing area can reduce the resistance to a certain extent when the flap is out of the chamber, and increase the underwater launch speed; and the front end adopts a circular table structure to reduce the bending deformation of the front end of the flap.

Description

technical field [0001] The invention belongs to the field of underwater launching, and in particular relates to a shelling valve for reducing fluid resistance. Background technique [0002] With the development and application of new technologies, modern naval warfare has put forward new requirements for various offensive and defensive weapons and equipment of the navy. It has good performance and has become the focus of the development of naval weapons and equipment in various countries. The supercavitation projectile is a new concept weapon that utilizes the principle of supercavitation drag reduction. It breaks through the movement limit of traditional projectiles in water, and greatly enhances the underwater range and damage capability. In order to increase the initial velocity of the supercavitating projectile under water, the shelling flap is usually used to increase the action area of ​​the gunpowder force. [0003] The front end surface of the existing flap is usua...

AI Technical Summary

Problems solved by technology

[0003] The front end of the existing card flap is usually an annular disc, which is not easy to bend and deform when it is out of the chamber

However, it has been found in practice that the following problems exist when using a clip with an annular disc at the front end for underwater launch: First, when the clip exits the chamber, the supercavitation formed by the projectile is not enough to wrap the clip , so that the entire annular disk of the clamping valve will be subject to greater pressure, resulting in huge resistance, which can cause a sudden drop in the firing speed in a very short time after being discharged from the chamber; second, during this period, the clamping valve and the bullet The resistance of the body is very different, and the resistance of the clamping flap is much greater than that of the projectile. Due to the inertial effect, the annular boss that matches the two will be subject to a large shear force, and bending deformation will occur, which will cause interference when the clamping flap is detached.

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