Two-Stage Propulsion System Retardant Combustion Delay
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Solution Overview
Problem
Throwing devices with solid fuel propulsion systems often produce excessive smoke and heat during launch, posing a risk to nearby individuals and potentially harming them.
Innovation Solution
A two-stage propulsion system with a first chamber containing a first propellant and a second chamber containing a second propellant, separated by a retardant to delay combustion, reducing immediate smoke and heat emission when triggered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single-stage solid fuel propulsion system is used, then the throwing device can achieve sufficient launch power, but excessive smoke and heat are produced during launch, posing a risk to nearby individuals
Solution Approach 1:
The propulsion system is divided into two separate stages: a first stage with a first propellant and a second stage with a second propellant. The first stage provides initial launch power, while the second stage continues propulsion after a delay period. This segmentation allows the harmful effects (smoke and heat) to be distributed over time rather than concentrated in a single intense burst, reducing the immediate hazard to nearby individuals while maintaining sufficient total launch power.
Solution Approach 2:
The propulsion system operates in periodic stages with the first propellant burning initially, then a retardant delays ignition of the second propellant. This creates a periodic action pattern where combustion occurs in distinct phases separated by a delay period. The periodic nature reduces continuous smoke and heat emission, allowing brief intervals where harmful emissions are minimized, thereby protecting nearby individuals while still achieving the required launch power through cumulative thrust.
2Object-affected harmful factors
If a two-stage propulsion system with delayed combustion is used, then smoke and heat emission is reduced, but the device complexity increases
Solution Approach 1:
The second propellant chamber is nested within or integrated with the first propellant chamber structure. The retardant is positioned between the two propellants in a compact arrangement where components are nested or integrated rather than separately mounted. This nesting approach reduces the overall device complexity by minimizing the number of separate components and simplifying the structural arrangement, while still achieving the smoke and heat reduction benefit through delayed combustion.
3Object-affected harmful factors
If a two-stage propulsion system is used, then the launch safety is improved, but the duration of action is extended
Solution Approach 1:
The propulsion system uses periodic action with distinct combustion phases separated by a delay period. The first propellant burns for a controlled duration, then the retardant delays ignition of the second propellant. This periodic operation improves launch safety by reducing peak smoke and heat emissions, while the extended total duration is managed by optimizing the burn times of each stage and the delay period to match the required mission profile, ensuring the extended duration does not compromise safety or performance.
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
The delayed combustion reduces smoke and heat emission, ensuring safer operation for individuals nearby during launch.
Implementation Method 1
a first chamber (112) containing a first propellant (114), and an igniter (116) for igniting the first propellant (114); a second chamber (122) containing a second propellant (124); and a retardant set (130) between the first propellant (114) and the second propellant (124) for delaying the combustion from the first propellant (114) to the second propellant (124)
Data Source
AI summary
The present disclosure provides a throwing device with a launcher and a propulsion system. The propulsion system comprises a retardant set between two sections of propellant for delaying the combustion and reducing the generated smoke or heat while launching the propulsion system. The launcher comprises: a tube for containing the propulsion system; and a trigger for triggering the ignition cartridge. A screw hole is in center of a bottom of the first chamber; nozzles are located around the screw hole; and a collar with a hole fixed in the bottom of the first chamber, wherein the ignition cartridge is fixed in the screw hole by the collar. The ignition cartridge comprises an explosive primer, and the launcher further comprises a firing pin triggered by the trigger to hit the explosive primer.