Baffled-Tube Ram Accelerator for Projectile Velocity
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Solution Overview
Problem
Conventional powder guns face limitations in accelerating projectiles to high speeds due to increased friction and energy requirements as the projectile gains velocity, while ram accelerators struggle with maintaining propulsion efficiency over long distances.
Innovation Solution
A baffled ram accelerator system with a plurality of baffles arranged along the inner surface of the tube, creating sequential propellant chambers that isolate the combustion process behind the projectile, allowing for the use of more energetic propellants and reducing friction by preventing combustion-generated pressure waves from being driven upstream, thereby increasing thrust without increasing propellant pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional powder guns are used to accelerate projectiles, then high initial thrust is achieved through propellant combustion, but the projectile slows down at high velocities due to increased friction and energy requirements
Solution Approach 1:
The tube is divided into multiple chambers by baffles, creating a segmented structure. Each chamber allows for controlled propellant combustion and pressure wave management, enabling the projectile to maintain thrust over longer distances without excessive energy loss to friction
Solution Approach 2:
Baffles act as intermediary elements that manage the interaction between combustion-generated pressure waves and the projectile. The baffles reflect and direct pressure waves to maintain thrust while preventing harmful upstream propagation, serving as a mediator between the propellant combustion process and the projectile motion
2Speed
If ram accelerators are used to achieve high speeds, then the projectile can ride its own combustion wave, but propulsion efficiency decreases over long distances due to combustion pulse management issues
Solution Approach 1:
The combustion process is segmented into discrete chambers by baffles, allowing each chamber to contribute to the combustion pulse. This segmentation enables sustained propulsion over longer distances by managing the combustion process in controlled stages, maintaining efficiency throughout the projectile's travel
Solution Approach 2:
The baffled chamber design ensures continuous useful action by maintaining controlled combustion and pressure wave propagation throughout the tube. Each chamber contributes to the ongoing combustion pulse, ensuring continuous thrust generation rather than intermittent propulsion, thereby extending effective propulsion distance
3Speed
If more energetic propellants are used in ram accelerators, then higher speeds can be achieved, but combustion-generated pressure waves are driven upstream causing instability
Solution Approach 1:
Baffles segment the combustion chambers, confining pressure waves within each chamber and preventing upstream propagation. This segmentation allows more energetic propellants to be used safely, as the baffles contain the combustion process and maintain stability even with higher energy density propellants
Solution Approach 2:
The baffles convert potentially harmful upstream-propagating pressure waves into beneficial localized combustion control. By reflecting and directing pressure waves, the baffles transform what would be destabilizing factors into controlled combustion drivers, enabling stable operation with more energetic propellants
4Duration of action of moving object
If propellant pressure is increased to maintain thrust over long distances, then propulsion efficiency improves, but the system complexity and safety requirements increase
Solution Approach 1:
The tube is segmented into multiple chambers by baffles, allowing thrust to be maintained through controlled combustion in each chamber rather than requiring uniformly high propellant pressure throughout. This segmentation extends propulsion duration while maintaining relatively simple system architecture
Solution Approach 2:
Combustion occurs in periodic stages as the projectile passes through each baffled chamber. This periodic combustion action maintains thrust over extended distances without requiring continuous high propellant pressure, reducing system complexity and safety requirements compared to constant high-pressure systems
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
Enables the acceleration of projectiles to higher speeds by maintaining efficient propulsion over longer distances, as the baffles act as one-way valves, allowing the projectile to ride its own combustion wave and reducing friction, thus overcoming the limitations of conventional powder guns.
Implementation Method 1
a unique propulsive cycle can be initiated in which the projectile compresses and ignites the propellant as it travels through the tube. This results in a combustion pulse being accelerated down the tube
Implementation Method 2
the baffles act as one-way valves, allowing the projectile to ride its own combustion wave and reducing friction
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 2D~2E
AI summary
A baffled ram accelerator system includes a ram accelerator tube with an inner surface and an outer surface and a plurality of baffles disposed on the inner surface. The plurality of baffles forms a sequential series of propellant chambers along the longitudinal axis of the ram accelerator tube. An accelerator gun is also disposed on an input end of the ram accelerator tube, and the accelerator gun is positioned to fire a projectile into the ram accelerator tube.