Reactive Foil Ignition for Flare Grain Reliability
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Solution Overview
Problem
Conventional pyrotechnic flares face challenges in safety and reliability during fabrication and ignition, with conventional igniter materials often failing to properly ignite, leading to increased failure rates and safety hazards.
Innovation Solution
A flare design incorporating a reactive foil with alternating layers of reactive materials, positioned proximate to the combustible grain, which ignites upon ignition to initiate an exothermic chemical reaction and combust the grain, enhancing ignition reliability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional igniter materials are used to ignite the grain, then the fabrication process is simple, but the ignition reliability is poor and failure rate increases
Solution Approach 1:
The ignition system is segmented into multiple functional components: a pyrophoric initiator that ignites upon impact, a reactive foil layer that receives ignition from the initiator, and the combustible grain. This segmentation allows each component to perform its specific function reliably, with the initiator providing consistent ignition source and the reactive foil ensuring complete grain ignition, thereby improving overall ignition reliability while maintaining fabrication simplicity
Solution Approach 2:
The pyrophoric initiator is pre-positioned within the grain assembly before deployment, and the reactive foil is pre-configured in direct contact with the grain surface. This preliminary arrangement ensures that upon activation, the ignition sequence occurs automatically without requiring additional complex control systems, thus improving reliability while avoiding increased device complexity
2Object-affected harmful factors
If conventional igniter materials are used, then the device structure is simple, but safety hazards increase during fabrication and use
Solution Approach 1:
The hazardous conventional igniter materials are extracted and replaced with a pyrophoric initiator that ignites through mechanical impact rather than chemical instability. This removal of inherently unstable materials eliminates the primary safety hazard during fabrication and storage, while the new impact-ignition mechanism provides inherent safety through its activation requirement
Solution Approach 2:
The reactive foil, which could be considered a hazardous material due to its reactivity, is converted into a safety mechanism by positioning it between the initiator and the grain. The foil's reactivity becomes beneficial by ensuring complete and controlled ignition of the grain, preventing incomplete combustion and associated safety issues, thus transforming a potential hazard into a safety feature
3Object-affected harmful factors
If conventional igniter materials are used, then manufacturing is straightforward, but environmental toxicity increases
Solution Approach 1:
The ignition chemistry is changed from conventional oxidizer-fuel based igniters to a pyrophoric metal-based system. This parameter change in the chemical composition eliminates toxic byproducts associated with conventional igniter combustion, reducing environmental toxicity. The manufacturing process remains straightforward as it involves depositing thin foil layers and positioning components, which are standard industrial processes
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 reactive foil design improves ignition reliability and safety by ensuring consistent combustion of the flare grain, reducing the risk of failure and environmental toxicity associated with conventional igniter materials.
Implementation Method 1
The reactive foil may include alternating layers of reactive materials configured to react with one another in an exothermic chemical reaction upon ignition
Implementation Method 2
The reactive foil includes alternating layers of reactive materials configured to react with one another in an exothermic chemical reaction upon ignition
Data Source
AI summary
Flares include grain assemblies comprising a combustible grain and a reactive foil positioned at least proximate to the grain and configured to ignite combustion of the grain upon ignition of the reactive foil. The reactive foil may include alternating layers of reactive materials. Methods of fabricating flares include at least partially covering an exterior surface of a combustible grain with a reactive foil to form a grain assembly, and inserting the grain assembly at least partially into a casing. The reactive foil may include alternating layers of reactive materials that are configured to react with one another in an exothermic chemical reaction upon ignition. Furthermore, methods of igniting a flare grain include initiating an exothermic chemical reaction between alternating layers of reactive materials in a reactive foil located proximate to the flare grain.