Aerospace Balloon Dynamic Vent Sealing for Safe Descent
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Solution Overview
Problem
Existing high-altitude zero-pressure balloons vent passively to maintain a zero-pressure state, which allows atmospheric gases to mix with lift gases, posing risks during descent, such as explosion and buoyancy loss.
Innovation Solution
A balloon system with passive vents that can transition between open and closed configurations, allowing lift gas venting at high altitudes while preventing atmospheric gas ingress during descent, using mechanisms like drawstrings, magnets, or expanding elements to seal the vents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If passive vents are used to maintain zero-pressure state, then balloon stability is improved, but atmospheric gas ingress during descent causes safety hazards
Solution Approach 1:
The vent system transitions from a static passive vent to a dynamic system with movable closure members that can open or close based on flight phase. The closure members are positioned to be naturally open during ascent for pressure equalization but can be closed during descent to prevent gas mixing, thus adapting the venting function to different operational requirements.
Solution Approach 2:
The closure members are designed to be passively actuated by flight conditions themselves - using pressure differentials, aerodynamic forces, or simple mechanical triggers related to ascent/descent phases. This allows the system to automatically switch between venting and sealing modes without complex active control, maintaining zero-pressure stability when needed while preventing gas mixing during descent.
2Stability of the object's composition
If passive vents remain open for zero-pressure maintenance, then balloon flight stability is improved, but explosion risk increases during descent
Solution Approach 1:
The closure members are positioned and configured to close the vents before descent begins or at the transition point from ascent to descent. This preliminary sealing action prevents atmospheric gas from entering the balloon during the critical descent phase where explosion risk is highest, while having maintained pressure equilibrium during the ascent phase.
Solution Approach 2:
The system applies a counter-action to the natural tendency of open vents to allow gas mixing during descent. By introducing closure members that actively seal the vents during descent, the system preemptively counteracts the harmful effect of gas mixing before it can occur, thus preventing explosion risks while maintaining pressure stability during flight.
3Object-affected harmful factors
If passive vents are sealed to prevent gas mixing, then safety is improved, but zero-pressure condition cannot be maintained
Solution Approach 1:
The vent system dynamically switches between open and closed states based on flight phase. During ascent, closure members are open to maintain zero-pressure condition through passive venting. During descent, the same closure members close to prevent gas mixing. This temporal separation allows both functions to be achieved without compromise.
Solution Approach 2:
The vent closure members operate periodically, opening during ascent phases and closing during descent phases. This periodic action aligns with the cyclic nature of balloon flight operations, allowing the system to maintain zero-pressure stability when vents are open while preventing gas mixing when vents are closed, thus achieving both objectives through time-based separation.
4Object-affected harmful factors
If closure mechanism is added to passive vents, then gas mixing is prevented, but device complexity increases
Solution Approach 1:
The closure members are designed to operate passively using natural forces associated with flight - such as pressure differentials, aerodynamic pressures, or simple mechanical triggers. This self-actuating approach prevents gas mixing without requiring complex active control systems, motors, or sensors, thus minimizing the increase in device complexity while achieving the safety benefit.
Solution Approach 2:
The closure mechanism uses simple, lightweight components such as flexible flaps, membranes, or basic mechanical latches that can be easily manufactured and integrated. These simple closure elements provide effective gas sealing without adding significant complexity to the vent system, maintaining cost-effectiveness and structural simplicity while preventing atmospheric gas ingress during descent.
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
AI summary
A balloon system including a balloon, and optionally including a payload and/or a safety module. A balloon, preferably including a balloon envelope and one or more passive vents, and optionally including one or more active valves. A method of balloon system operation, preferably including maintaining a zero-pressure balloon condition and sealing balloon vents, and optionally including ascending, descending, and/or otherwise operating the balloon system in flight.