Movable Cap Secondary Chamber Combustion Pressure Control
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Solution Overview
Problem
In gas generating systems with secondary chambers, the pressure within the secondary chamber can fall below a value conducive to efficient combustion of the gas generant material during combustion, necessitating improved pressure control mechanisms.
Innovation Solution
A dual-stage gas generating system with a movable cap in the secondary chamber that forms gas flow passages with a constant cross-sectional area entry, allowing pressure differential-driven cap movement to control gas flow and maintain efficient combustion pressure within the secondary chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the secondary chamber is in fluid communication with the primary chamber during combustion of the secondary chamber gas generant material, then gas can be released into the primary chamber, but the pressure within the secondary chamber may fall below a value conducive to efficient combustion of the material
Solution Approach 1:
The cap is made movable rather than fixed, allowing it to respond dynamically to pressure differentials between the secondary and primary chambers. This dynamic positioning enables the system to maintain optimal pressure conditions for combustion while controlling gas flow timing
Solution Approach 2:
The cap acts as an intermediary component between the secondary and primary chambers, mediating the fluid communication through pressure-driven movement. It controls when and how gas flows between chambers, ensuring combustion efficiency is maintained
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 ensures efficient combustion of the secondary gas generant by regulating pressure within the secondary chamber, maintaining it within a range conducive to self-sustaining combustion reactions, even when the primary chamber pressure falls.
Implementation Method 1
the cap is movable in a first direction responsive to a pressure differential wherein a pressure within the shell is greater than a pressure exterior of the shell
Implementation Method 2
during combustion of the secondary chamber gas generant material
Data Source
AI summary
A gas generating system includes a primary combustion chamber and a secondary combustion chamber. The secondary chamber includes a shell and a cap secured to the shell such that the cap is movable in a first direction responsive to a pressure differential wherein a pressure within the shell is greater than a pressure exterior of the shell. At least one gas flow passage is bounded by the shell and by a cavity extending along an exterior of the cap.