Rocket Engine Bypassing Catalyst Bed for Liquid Hydrogen Peroxide Decomposition
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Solution Overview
Problem
Current rocket engines using liquid fuels and oxidizers face challenges such as separate storage requirements, limited storage life, incompatibility with solid fuels, and the need for catalyst beds to decompose hydrogen peroxide, which add mass and volume, and are often polluting.
Innovation Solution
A rocket engine configuration that operates on liquid fuel and liquid hydrogen peroxide without a catalyst bed for continuous decomposition, using a small catalyst bed for initial ignition and then bypassing it, allowing the hydrogen peroxide to decompose in the high-temperature, high-pressure reaction chamber, and optionally using a predetonation tube for initial ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catalyst bed is used to decompose hydrogen peroxide during continuous operation, then the oxidizer can be effectively utilized, but the mass and volume of the rocket system increases significantly
Solution Approach 1:
The patent applies preliminary action by using a small catalyst bed only for initial ignition and decomposition of hydrogen peroxide before flight. Once the rocket is in operation, the pre-decomposed oxidizer is supplied without requiring continuous catalytic decomposition, thus eliminating the need for a large catalyst bed while ensuring reliable startup and continuous operation
Solution Approach 2:
The patent segments the oxidizer supply system into two distinct phases: initial ignition phase using catalytic decomposition through a small catalyst bed, and continuous operation phase using direct supply of liquid hydrogen peroxide to the combustion chamber. This segmentation allows the system to use minimal catalyst while maintaining reliable operation throughout the flight
2Quantity of substance
If hydrogen peroxide is stored as liquid oxidizer, then it provides high oxygen concentration and green chemistry benefits, but it requires continuous refrigeration and has limited storage life
Solution Approach 1:
The patent changes the temperature parameter of hydrogen peroxide storage from ambient or refrigerated conditions to cryogenic temperatures (liquid state). This parameter change enables high oxygen concentration (47% by mass) and efficient combustion performance, while the system is designed to manage the associated refrigeration requirements and storage life limitations through controlled operation
3Object-generated harmful factors
If liquid hydrogen peroxide is used as oxidizer, then pollution is reduced and green chemistry is achieved, but a catalyst bed is required for decomposition which adds complexity
Solution Approach 1:
The patent uses preliminary catalytic decomposition only for initial ignition and startup, then switches to direct combustion of liquid hydrogen peroxide with fuel in the main combustion chamber. This preliminary action approach maintains the green chemistry benefits of hydrogen peroxide (producing only water and oxygen) while minimizing catalyst system complexity to only what is needed for startup
Solution Approach 2:
The patent extracts the catalyst bed function from the continuous operation system, using it only for initial ignition and decomposition. The main combustion chamber operates without catalyst, directly combusting liquid hydrogen peroxide with fuel, thus eliminating the complexity of a continuous catalytic decomposition system while maintaining environmental benefits
4Weight of moving object
If a small catalyst bed is used for initial ignition only, then mass and volume are reduced, but the system must transition from catalytic to direct combustion operation
Solution Approach 1:
The patent implements a dynamic operation mode where the system transitions from catalytic decomposition (initial phase) to direct combustion (continuous operation phase). The small catalyst bed is used only during startup to generate initial decomposition products, after which the system dynamically switches to direct injection and combustion of liquid hydrogen peroxide in the main chamber, managing the transition through controlled operation sequences
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
This configuration reduces the size and mass of the catalyst bed, enabling more efficient packaging and continuous operation without pre-decomposition, while utilizing hydrogen peroxide as a 'green' oxidizer, reducing pollution and storage complexities.
Implementation Method 1
a catalyst bed configured and sized to support decomposition of the liquid H2O2 for initial reaction with the liquid fuel
Implementation Method 2
the decomposed products are mixed with the liquid fuel to initiate combustion
Implementation Method 3
detonation of the fuel/oxidizer mixture is self-sustaining... achieving a higher specific impulse
Data Source
AI summary
Disclosed is a method for initiating startup of a rocket engine configured to run on a liquid fuel and liquid hydrogen peroxide, including the steps of: initially decomposing the liquid hydrogen peroxide by passing the liquid hydrogen peroxide through a catalyst bed; passing decomposition products from the catalyst bed to a reaction chamber of the rocket engine and mixing the decomposition products with the liquid fuel to initiate detonation. Once detonation is initiated, the liquid H2O2 and liquid fuel are passed directly to a reaction chamber of the rocket, bypassing the catalyst bed. A rocket system includes a rocket engine having an initial ignition circuit having a catalyst bed sized to support decomposition of liquid H2O2 for initial reaction with the liquid fuel. The rocket engine, upon initial ignition, is configured to run on liquid fuel and liquid H2O2 without first passing the liquid H2O2 through the catalyst bed.