Practice Cartridge Bagged Propellant Axial Symmetry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing full-caliber training cartridges experience undesirable gas pressure fluctuations in the weapon barrel during firing, leading to potential leaks and uneven muzzle velocities due to the arrangement of propellant charge powder in a sack-shaped container along the longitudinal axis.
Innovation Solution
The propellant charge powder is stored in a bag-like container that extends axially from the bottom end region of the propellant charge case into the tubular tail body, with its longitudinal axis as the axis of symmetry, preventing uneven pressure build-up and pressure waves within the weapon barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the propellant charge powder is stored in a sack-shaped container extending axially from the bottom end region into the tubular tail body, then the pressure distribution becomes uniform and pressure waves are avoided, but the device complexity increases due to the extended axial arrangement
Solution Approach 1:
The sack-shaped container extends axially into the tubular tail body rather than being confined to the propellant charge case, utilizing the longitudinal space dimension to achieve symmetric pressure distribution. This dimensional extension allows the container to span the entire propellant charge while maintaining symmetry around the cartridge axis, preventing pressure waves without requiring additional complex components.
2Object-generated harmful factors
If the propellant charge powder is stored in a sack-shaped container, then the pressure waves are reduced, but the sealing reliability deteriorates due to potential leaks on the case bottom side caused by pressure fluctuations
Solution Approach 1:
The sack-shaped container is positioned asymmetrically relative to traditional arrangements by extending axially from the bottom end region through the tubular tail body, creating a symmetric pressure distribution pattern around the cartridge axis. This asymmetric positioning strategy eliminates the asymmetric pressure buildup that causes sealing failures at the case base, thereby improving sealing reliability while reducing pressure waves.
3Manufacturing precision
If the propellant charge powder is stored in a sack-shaped container extending into the tubular tail body, then the muzzle velocity scattering is reduced, but the manufacturing complexity increases due to precise axial and radial centering requirements
Solution Approach 1:
The sack-shaped container is designed to be supported by the annular wall area of the propellant charge case front face, creating a centered positioning system. This support arrangement ensures axial and radial centering of the container within the tubular tail body, establishing an equipotential position that guarantees consistent muzzle velocities by ensuring uniform propellant combustion and pressure distribution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively avoids pressure waves and sealing issues, ensuring uniform pressure distribution and reduced muzzle velocity scattering of the training projectiles.
Implementation Method 1
the propellant charge powder (9) arranged in a bag-like container (11) which extends in the direction of the longitudinal axis (100) of the training cartridge (1) and encloses a propellant charge igniter (10)
Implementation Method 2
the bag-shaped container containing the powder charge extends axially from the bottom end region of the propellant charge case into the interior of the tubular tail body, with the longitudinal axis of the cartridge being the axis of symmetry of the bag-shaped container at the same time. This measure prevents an uneven build-up of pressure during the ignition and burn-up of the propellant powder
Implementation Method 3
the propellant gases produced when the training projectile is fired reach the interior of the tubular tail body and act on the rear area of the head part, which delimits the interior space on the projectile head side, to accelerate the training projectile
Data Source
AI summary
Practice cartridge comprising a propellant sleeve (2), which is at least partially filled with a propellant powder (9), and a fin-stabilized full-calibre practice projectile (3), fastened to the front of the propellant sleeve (2), wherein the practice projectile (3) comprises a solid head part (4) and a tubular tail assembly (5) adjoining the head part (4) to the rear. To achieve the effect that, after firing the practice cartridge (1), no appreciable pressure fluctuations occur in the barrel of the corresponding weapon even in the case of relatively small amounts of propellant powder (9), the invention proposes that a container in the form of a bag and containing the propellant powder (9) extends axially from the bottom end region of the propellant sleeve (2) into the inner space (13) of the tubular tail assembly (5).