Staged Catalytic Igniter for Rocket Thrusters
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Solution Overview
Problem
Conventional ignition systems for non-hypergolic propellants are heavy, complex, and limited to short active durations, failing to provide efficient and reliable ignition solutions for various combustion devices.
Innovation Solution
An igniter system featuring a staged relationship between a pilot-catalyst section and a main catalyst section, where Nitrous Oxide propellant is decomposed through the pilot-catalyst section to preheat the main catalyst section, facilitating efficient ignition by producing a high-temperature gas to ignite the main propellant, utilizing materials like Platinum group metals and Oxides for catalyst beds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ignition systems (spark igniters, pyrotechnique, hypergol slug cartridge) are used, then ignition function is achieved, but the system becomes heavy and complex
Solution Approach 1:
The igniter is divided into two distinct sections: a pilot-catalyst section and a main catalyst section. The pilot section uses a spark igniter to initiate decomposition of nitrous oxide, which then flows to the main catalyst section where catalytic decomposition occurs. This segmentation allows each section to be optimized for its specific function, reducing overall system complexity while maintaining reliability.
Solution Approach 2:
Nitrous oxide serves as an intermediary substance between the pilot section and main catalyst section. The pilot section decomposes nitrous oxide to produce hot gas that preheats and initiates decomposition in the main catalyst section. This intermediary approach eliminates the need for direct ignition of the main propellant, simplifying the overall ignition system.
2Reliability
If conventional ignition systems are used, then ignition function is achieved, but the active duration is limited to short periods
Solution Approach 1:
The pilot-catalyst section performs preliminary decomposition of nitrous oxide to produce hot gas that preheats the main catalyst section before the main propellant ignition. This preliminary action ensures that when the main propellant is introduced, the catalyst is already at the required temperature for efficient decomposition, enabling sustained operation rather than limited short-duration ignition.
Solution Approach 2:
The staged decomposition process creates a continuous useful action: the pilot section continuously decomposes nitrous oxide to maintain catalyst temperature, while the main catalyst section continuously decomposes propellant for sustained thrust. This continuous process eliminates the short active duration limitation of conventional single-stage igniters.
3Duration of action of moving object
If catalytic decomposition chamber is used with staged sections, then efficient and long-duration ignition is achieved, but the device structure becomes more complex
Solution Approach 1:
The pilot-catalyst section and main catalyst section are merged into a single integrated igniter assembly with a unified catalyst chamber. The sections are arranged in series along the flow path, sharing common structural elements and propellant supply systems. This merging approach enables long-duration ignition while minimizing structural complexity compared to separate independent 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
The system achieves reliable, efficient, and long-duration ignition for combustion devices, such as rocket engines and thrusters, with improved compactness and durability, enabling applications in diverse propulsion and combustion systems.
Implementation Method 1
supplying a propellant to an igniter, the propellant having a Nitrous Oxide (N2O)... staging decomposition though a pilot-catalyst section which preheats a main catalyst section adjacent to the pilot-catalyst section
Data Source
AI summary
An ignition system and method of igniting the ignition system includes a main catalyst section in a staged relationship with a pilot-catalyst section to stage a decomposition though the pilot-catalyst section which preheats the main catalyst section.