Pulsating Recoil Brake Using Ejector and Laval Nozzle
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Solution Overview
Problem
Existing methods for reducing recoil in firearms, such as those described in Hungarian patent HU 230756, face inefficiencies due to delayed operation caused by large drive mechanisms and reduced combustible material flow, leading to longer rearward movement and decreased combustion efficiency.
Innovation Solution
A method and design that introduces as much gunpowder gas as possible into a pulsating reactive drive mechanism using a Laval nozzle-like barrel gas port and a variable operation ejector, preventing backflow and ensuring high pressure for efficient combustion, with a secondary medium transport duct to introduce oxidants and catalysts, and a one-way valve to manage combustion products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a relatively large drive mechanism is used to introduce oxidant for continued combustion, then combustion efficiency is improved, but the delay in operation increases and the firearm moves backwards on a longer path without restraint
Solution Approach 1:
The combustion process is divided into two distinct stages: primary combustion in the barrel and secondary combustion (afterburn) in the drive mechanism. This segmentation allows the oxidant introduction and combustion to occur in separate zones, enabling more efficient use of combustion energy while reducing the time required for the overall process.
Solution Approach 2:
The ejector is designed to pre-mix the gunpowder gases with external medium (containing oxidant) before the mixture enters the combustion chamber. This preliminary mixing action ensures that combustion can occur rapidly and efficiently once ignition occurs, reducing the overall operation delay while maintaining high combustion efficiency.
2Quantity of substance
If ducts are used to transport gunpowder gases from the barrel to the drive mechanism, then gas transport is achieved, but the flow significantly slows down and less combustible material enters the pulsating reactive drive mechanism
Solution Approach 1:
The ejector utilizes pneumatic principles to transport gunpowder gases from the barrel to the drive mechanism. By using pressure differentials and fluid dynamics rather than simple duct transport, the system maintains higher gas flow velocities and ensures that a greater quantity of combustible material reaches the combustion chamber.
Solution Approach 2:
The drive mechanism operates in pulsating cycles, creating periodic pressure variations that actively draw gunpowder gases through the ejector. This periodic action prevents flow stagnation and maintains high velocity gas flow, ensuring maximum combustible material delivery to the combustion chamber.
3Speed
If the barrel gas port opening is designed as a highly resistant reversing channel, then flow control is achieved, but the exit velocity of gas is reduced
Solution Approach 1:
The barrel gas port opening is designed with specific geometric parameters (similar to a Laval nozzle) that optimize the balance between flow control and exit velocity. By carefully selecting the port's cross-sectional area, shape, and orientation, the system achieves effective flow direction control while minimizing resistance and maintaining high gas exit velocity.
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 approach enhances the recoil brake's efficiency and reduces its size by ensuring maximum combustible material and oxidant introduction, minimizing delay and improving kinetic energy transfer, resulting in a more rapid and effective braking action.
Implementation Method 1
the barrel gas port opening must be similar to the Laval nozzle and gases must enter to the combustion chamber through a rather straight path
Implementation Method 2
the medium entering into the nozzle from the combustion chamber induces 'suction' effect towards the secondary duct of the ejector and the barrel (Venturi effect)
Implementation Method 3
the combustion of the mixture of the gunpowder gas entering from the barrel and the outer medium takes place in the combustion chamber and the afterburner chamber
Implementation Method 4
pulsating reactive drive mechanism acting in a direction opposite to the direction of the shot
Data Source
AI summary
The invention relates to a gun provided with recoil brake (14) and a method for improving the efficiency of the same. During the method a portion of the gunpowder gases burnt by means of the oxidant present in the barrel (2) of the gun but still containing inflammable material is introduced as the primary medium from the barrel (2) of the gun into the nozzle (9) of an ejector and the secondary medium is thus pumped in for forming a pre-mixture which is introduced into the combustion chamber of a pulsating reactive drive mechanism (10) acting in a direction opposite to the direction of the shot. This mixture is further burnt by means of the medium containing oxidant present in the drive mechanism (10), the combustion product is led out through the blow pipe (18) and the flow-back taking place during combustion is avoided by means of a valve. The barrel has gas port openings (3) from which the gunpowder gases as primary medium are introduced into the mixed medium transport duct (5) connected to the secondary medium transport duct (4) of the variable operation ejector (8), and in this manner the external oxidant containing medium is pumped in. This mixture from the direction of the nozzle (9) is introduced into the combustion chamber (13) of a pulsating reactive drive mechanism (10), and the flow back is prevented by the ram pressure of the mixture flowing into the combustion chamber (13) through the nozzle (9). The medium present in the combustion chamber (13) is compressed and after the pressure exceeds the pressure in the barrel (2) due to the processes taken place in the combustion chamber (13) and the flow turns back, the combustion product gases as a new primary medium flowing through the nozzle (9) together with the medium transported from the barrel (2) through the mixed medium transport duct (5) and with the medium again transported from the external environment through the secondary medium transport duct (4) is pressed into the afterburner chamber (17) provided on the other side of the variable operation ejector (8) where this mixture is further burnt in the presence of a catalyst reducing the activation energy of the combustible material, then the combustion product is exhausted through the blow pipe (18).