Dual-Loop Thermal Power Architecture for Hypersonic Vehicle Cooling
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Solution Overview
Problem
High-speed flight vehicles experience extreme temperatures and reduced power generation capabilities due to the limitations of existing materials and engine configurations, necessitating the development of efficient thermal management and power generation systems.
Innovation Solution
A dual-loop architecture system utilizing a power generation loop and a heat transport loop with supercritical carbon dioxide, incorporating compressors, heat exchangers, and thermal engines to convert heat into electrical and mechanical power while maintaining working fluids in a supercritical state, decoupling power generation from mass heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high density materials such as superalloys or ceramic matrix composites are used to withstand extreme temperatures at hypersonic speeds, then temperature resistance is improved, but material cost and vehicle weight increase
Solution Approach 1:
The system converts the harmful aerodynamic heating at hypersonic speeds into a beneficial heat source for power generation. The inlet air heat exchanger captures thermal energy from the heated inlet air that would otherwise be waste, using it to heat the working fluid in the power generation loop. This transforms the harmful thermal load into useful energy for driving the thermal engine and generating electrical power.
Solution Approach 2:
The system changes the operational parameters by maintaining the working fluid in a supercritical state throughout the cycle, enabling efficient heat transfer and power generation at the high temperatures encountered during hypersonic flight. The controller adjusts compressor operation and heat exchanger parameters to optimize performance across different flight conditions.
2Temperature
If more air flow is diverted to the augmenter at higher speeds, then cooling capability is improved, but power generation capability deteriorates
Solution Approach 1:
The inlet air heat exchanger serves multiple functions simultaneously: it cools the incoming air for the propulsion system while also heating the working fluid for power generation. The heat transport loop extracts thermal energy from the inlet air, providing both cooling for the vehicle and heat input for the power generation cycle, thus resolving the trade-off between cooling and power generation.
Solution Approach 2:
The system segments the thermal management and power generation functions into separate but integrated loops. The heat transport loop handles thermal energy extraction from inlet air, while the power generation loop converts this thermal energy into mechanical and electrical power. This segmentation allows independent optimization of each function while maintaining overall system efficiency.
3Device complexity
If a single loop system is used for both power generation and heat transport, then device complexity is reduced, but system efficiency deteriorates
Solution Approach 1:
The system is divided into two separate loops: a power generation loop containing the compressor, heat exchanger, thermal engine, and generator; and a heat transport loop containing the heat transport compressor and heat transport thermal engine. This segmentation allows each loop to be optimized for its specific function, with the power generation loop focused on electricity production and the heat transport loop focused on thermal energy management, thereby improving overall system efficiency.
Solution Approach 2:
The inlet air heat exchanger acts as an intermediary component that couples the two loops. It receives heated inlet air, transfers thermal energy to the working fluid in the power generation loop, and provides both cooling and heat input simultaneously. This intermediary enables efficient energy transfer between the loops while maintaining their functional independence.
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 effectively cools the vehicle and generates power at high speeds, reducing material costs and weight, achieving higher power densities and efficiency compared to conventional methods.
Implementation Method 1
an inlet air heat exchanger, the inlet air heat exchanger including an inlet air line fluidly communicating with the heated inlet air and a first air-to-loop line located in thermally coupled relation to the inlet air line
Implementation Method 2
compressing the first working fluid through a first compressor
Implementation Method 3
expanding the first working fluid in a first thermal engine to generate a first work output from the first thermal engine
Implementation Method 4
maintaining working fluids in a supercritical state
Data Source
AI summary
Methods and apparatus for power generation and/or thermal management on a high speed flight vehicle include circulating a power generation loop working fluid through a power generation loop, which absorbs heat associated with the flight vehicle. A generator operably coupled to the power generation loop generates electrical power. Additionally, a heat transport loop working fluid may circulate through a heat transport loop to provide thermal management through heat transfer.