Catalyst Bed Channel Geometry for Pump-Free Nitrous Oxide Decomposition
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Solution Overview
Problem
Existing chemical rocket engines face challenges in efficiently and reliably initiating hybrid rocket ignition and propulsion using nitrous oxide as a self-pressurizing liquid oxidizer, particularly in systems where complex pumping systems are undesirable.
Innovation Solution
A catalyst bed with a structured geometry, manufactured via additive manufacturing, is used to promote the catalytic decomposition of nitrous oxide into oxygen and nitrogen gases, which are then utilized for ignition and propulsion, eliminating the need for complex pumping systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex pumping systems are used to deliver nitrous oxide, then reliable ignition and propulsion can be achieved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical pumping system with a catalytic decomposition system. Nitrous oxide is delivered through simple tubing without pumps, and decomposition is initiated by bringing the cold flow into contact with a heated catalyst bed, which autonomously decomposes the N2O to provide ignition and propulsion.
Solution Approach 2:
The catalyst bed is heated beforehand and autonomously decomposes the incoming nitrous oxide flow without external control. The system self-regulates the decomposition process through the catalytic reaction, eliminating the need for complex pumping and control mechanisms.
2Productivity
If catalyst bed surface area is increased to improve decomposition efficiency, then catalytic efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent employs a porous monolithic support structure for the catalyst bed. This porous geometry inherently provides high surface area for catalytic decomposition while maintaining a single-piece structure that can be manufactured using additive manufacturing techniques, avoiding complex assembly requirements.
Solution Approach 2:
The catalyst bed consists of a composite structure combining a monolithic support material with deposited catalyst particles. This composite approach allows the support structure to provide mechanical strength and geometric complexity, while the catalyst layer provides the decomposition function, enabling high surface area with manufacturable complexity.
3Reliability
If nitrous oxide decomposition is used for hybrid rocket ignition, then ignition reliability improves, but temperature control becomes more difficult
Solution Approach 1:
The patent controls the decomposition temperature by adjusting the temperature of the catalyst bed and the flow rate of nitrous oxide. By varying these parameters, the system can regulate the intensity of the exothermic decomposition reaction to match the thermal requirements of different ignition scenarios.
Solution Approach 2:
The system utilizes feedback from temperature sensors and flow meters to monitor and adjust the decomposition process. This feedback mechanism allows dynamic control of the catalytic decomposition to maintain optimal temperature conditions for reliable ignition while preventing excessive heat generation.
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 catalyst solution effectively enhances the efficacy of the catalyst's efficiency by enabling the catalyst to efficiently address the technical problem, enhancing the catalyst's efficiency by enabling the catalyst's efficiency by enabling the catalyst's efficiency by enabling the catalyst's efficiency by enabling the catalyst's efficiency by enabling the catalyst's efficiency by enabling the catalyst's efficiency.
Implementation Method 1
a catalyst bed with a structured geometry, manufactured via additive manufacturing, is used to promote the catalytic decomposition of nitrous oxide into oxygen and nitrogen gases
Data Source
AI summary
A catalyst bed includes a structure defining a plurality of channels configured to receive flow of fluid to be chemically catalyzed. The plurality of channels are oriented at least partially non-parallel to an overall flow direction of the flow from inputs of the plurality of channels to outputs of the plurality of channels. A catalyst is exposed at an exterior of the structure.