Propelling-stable cannonball support for air cannon and design method of cannonball support

A technology of air cannons and bullet holders, which is applied in the direction of launching devices and sustainable transportation, can solve the problems of large leakage in the gap of ordinary bullet holders, affecting the propulsion efficiency of the bullet holder, and unstable propulsion, so as to reduce the design and mechanical processing Difficulty, reduce loss, and ensure the effect of stable launch

Active Publication Date: 2019-04-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the friction between the bullet holder and the gun barrel, in addition, impurities and processing defects on the outer wall of the bullet holder and the inner wall of the gun barrel easily interfere with each other when the gap is small, resulting in unstable propulsion. The gap leakage of the support is large, which affects the propulsion efficiency of the support. Therefore, it is urgent to develop an efficient and stable propelling support and its design method

Method used

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  • Propelling-stable cannonball support for air cannon and design method of cannonball support
  • Propelling-stable cannonball support for air cannon and design method of cannonball support
  • Propelling-stable cannonball support for air cannon and design method of cannonball support

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Embodiment 1

[0028] This embodiment is the embodiment of the flick support structure.

[0029] Please combine Figure 2 to Figure 4 As shown, the present invention discloses a stabilizing propelling bullet holder for an air cannon. The bullet holder is used in an air cannon and carries projectiles. The bullet holder includes a cylindrical bullet holder body, at least one annular groove is arranged on the outer surface of the bullet holder body, and the annular groove is circumferentially arranged on the bullet holder body.

[0030] Specifically, as figure 2 , the flipper body 1 has three mutually parallel and evenly arranged annular grooves 2, and the width and depth of the three annular grooves 2 are the same. The bullet rest structure is numbered B structure in this embodiment. Such as image 3 There are four annular grooves parallel to each other on the bullet holder body 1', and the width and depth of two of the annular grooves 21' are the same, and the width of the other two annu...

Embodiment 2

[0033] This embodiment is an embodiment of the design method of the flick support structure.

[0034] Please combine Figure 6 Shown, the design method of air cannon in the present invention is used stably propelling bullet holder, comprises the following steps:

[0035] (1), given the initial design parameters, design several types of bullet holders, the number of grooves and groove widths on each type of bullet holder are different;

[0036] (2) Through the analysis, modeling, calculation and analysis of the gap leakage of several different types of bullet holders, the leakage of different bullet holders is obtained;

[0037] (3), comparing the leakage of each type of bullet holder, the type of bullet holder with the smallest leakage is used as the initial design configuration;

[0038] (4), setting the leakage index of the bullet holder of initial design configuration, as the initial target parameter of further iteration;

[0039] (5), given the design parameters of the ...

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Abstract

The invention discloses a propelling-stable cannonball support for an air cannon and a design method of the cannonball support. Grooves with different numbers and sizes are machined in the outer sideof the cylindrical cannonball support, the gap leakage amount generated when the cannonball support moves in a cannon barrel is reduced, the gap between the cannonball support and the cannon barrel can be increased under the same gap leakage amount, and therefore unstable movement caused by the interference such as machining and impurities of the outer wall of the cannonball support and the innerwall of a cannon bore can be reduced, loss generated during launching of the cannonball support under the same launching pressure is reduced, the design and machining difficulty are reduced, and stable launching of the cannonball support is guaranteed; and the two-dimensional cannonball support profile curve is subjected to iteration and calculation through the mode of making the gap leakage amount index objective function, the cannonball support two-dimensional profile of the corresponding design gap leakage amount rate index parameter is obtained, and therefore the geometrical shape of thepropelling-stable cannonball support is designed. The cannonball support and the related design method can provide an efficient and stable propelling test technical support for various air cannon tests.

Description

technical field [0001] The invention relates to the technical field of an air cannon launch test device, in particular to a bullet holder used in an air cannon launch test. Background technique [0002] In aero-engine component birds, ice impact, foreign object swallowing, blade loss, casing containment shooting, or other impact dynamics tests, it is necessary to use the test technology of projectiles fired by air cannons to hit the target plate. Projectiles of different sizes and shapes are adapted to the inner wall of the air cannon, and the acceleration process of the projectiles is as stable as possible. For example, the bullet holder described in Chinese Patent No. ZL 201310574270.9 adopts a cylindrical hollow bullet holder as the bullet-cannon matching device. However, due to the friction between the bullet holder and the gun barrel, in addition, impurities and processing defects on the outer wall of the bullet holder and the inner wall of the gun barrel easily interf...

Claims

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Application Information

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IPC IPC(8): F41F1/00
CPCF41F1/00Y02T90/00
Inventor 罗刚刘璐璐陈伟杨飞赵振华马驰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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