Flat Gas-Envelope Aerostat for Compact High-Altitude Deployment
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Solution Overview
Problem
Existing high-altitude aerostats struggle to deliver a large surface area effectively for applications like Solar Radiation Management (SRM) and airborne solar power generation, as they are cumbersome, vulnerable, and difficult to deploy and operate, while maintaining stability in the lower stratosphere.
Innovation Solution
A variable-volume aerostat system with a flat gas envelope that expands to a large surface area at high altitude, using internally-connected aerostat bodies to provide lifting gas and depth-constraining structures for neutral buoyancy, allowing compact storage and easy handling at ground level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large surface area is provided for SRM or solar power generation, then the effectiveness of the application is improved, but the complexity of deployment and operation increases
Solution Approach 1:
The system divides the large surface area into multiple segments by using multiple aerostat bodies (first aerostat body, second aerostat body, etc.) that can be independently controlled. Each aerostat body contains gas cells that can be independently filled with lifting gas, allowing the surface area to be segmented and deployed in a controlled manner to reduce overall deployment complexity.
Solution Approach 2:
The system employs dynamic volume adjustment where the gas cells within each aerostat body can be inflated or deflated to change the overall volume and surface area of the aerostat system. This dynamic capability allows the structure to adapt to different operational requirements and simplifies deployment by enabling progressive inflation rather than requiring a fully assembled large structure.
2Ease of operation
If the aerostat is designed to be compact for easy handling at ground level, then ease of operation is improved, but the surface area available at high altitude is reduced
Solution Approach 1:
The gas cells within each aerostat body are designed to be nested or foldable when not in use, allowing the aerostat system to be compacted into a small, manageable package for easy ground handling and transport. When deployed, these nested gas cells are inflated to expand the surface area, thus achieving both compact storage and large operational surface area.
Solution Approach 2:
The system changes the physical state of the gas cells from compressed/deflated (for compact storage) to inflated (for surface area generation). By controlling the volume parameter of the gas cells, the system transitions between a compact, easy-to-handle state at ground level and a large surface area configuration at high altitude, resolving the contradiction between handling ease and surface area.
3Force
If lifting gas is filled in the gas envelope at ground level, then ground lift capacity is improved, but the ability to expand volume at high altitude is reduced
Solution Approach 1:
The lifting gas system is segmented into multiple gas cells distributed across different aerostat bodies rather than being contained in a single envelope. This segmentation allows selective filling of individual gas cells with lifting gas to provide ground lift capacity, while leaving other gas cells empty and ready for expansion at high altitude. The segmented structure enables independent control of gas filling to balance ground lift requirements with future expansion capability.
Solution Approach 2:
The system performs preliminary action by filling only a portion of the gas cells with lifting gas at ground level to provide sufficient lift for launch, while deliberately leaving other gas cells unfilling to maintain expansion capability. This preliminary partial filling allows the aerostat to achieve ground lift capacity without compromising the ability to expand volume later at high altitude when the remaining gas cells are inflated.
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 maximizes surface area by a factor of up to 100 at high altitude, enabling practical handling and deployment, and provides a stable platform for SRM and solar power generation with enhanced sunlight interaction and reduced atmospheric risk.
Implementation Method 1
Following Boyle's Law, at constant temperature, the volume of lifting gas must increase in inverse proportion to the decrease in pressure with altitude
Implementation Method 2
Depth-constraining structures (101), such as tendons, constrain the depth of the flat gas envelope and determine its shape
Data Source
AI summary
A variable-volume aerostat, consisting of a flat gas envelope, joined to guide aerostat bodies. The flat gas envelope is typically deployed by rotation of cylindrical guide airships, or rollers suspended beneath guide aerostats. In its stowed configuration, the flat gas envelope is rolled, uninflated and relatively compact. As the invention ascends to high altitude, lifting gas expands out of the guide aerostats into the unrolling flat gas envelope. When fully deployed, the flat gas envelope is self-supporting, and has a horizontal surface area up-to 100 times larger than that of the guide aerostats. This is a major advantage in potential applications, including targeted Solar Radiation Management (SRM), and airborne solar power generation.