Shaft-Driven Compressor for Aircraft Bleed Air Pressure Boosting
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Solution Overview
Problem
Commercial aircraft bleed air systems waste energy by extracting high-pressure bleed air from engine compressors, cooling, and pressurizing ambient air, leading to inefficiencies and increased fuel consumption, while existing systems suffer from drag, icing issues, and complexity.
Innovation Solution
A shaft-driven compressor system that extracts and pressurizes low-pressure bleed air from aircraft engines, reducing energy waste by boosting pressure to meet system demands without exceeding them, and optionally using a two-port or single-port bleed air system for redundancy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high-pressure bleed air is extracted from the mid-stage of the high pressure compressor, then the pressure and temperature demands of aircraft systems are met, but much energy is wasted through cooling and pressure reduction, and engine efficiency is reduced
Solution Approach 1:
The bleed air extraction is segmented into multiple ports at different stages of the compressor (low-pressure bleed port and high-pressure bleed port), allowing selective extraction at optimal points to minimize energy waste while meeting system pressure demands
Solution Approach 2:
The system dynamically selects which bleed air port to use based on aircraft operating conditions, allowing the compressor to operate at optimal efficiency points while providing bleed air at the required pressure level
2Stress or pressure
If a shaft-driven supercharger is used to pressurize ambient air, then pressurized air is provided for cabin environmental control, but drag is produced, icing susceptibility increases, and system complexity increases
Solution Approach 1:
The compressor system serves multiple functions: it provides pressurized air for environmental control, can extract bleed air from different compressor stages, and can operate in conjunction with existing engine systems, thereby reducing the need for separate dedicated systems
Solution Approach 2:
The system uses the engine's own compressed air from the compressor stages to provide bleed air for aircraft systems, eliminating the need for separate atmospheric air intake systems and reducing overall system complexity
3Stress or pressure
If a turbo-compressor is used to pressurize ambient air, then pressurized air is provided for aircraft systems, but drag is produced and the system requires anti-icing systems that increase costs and complexity
Solution Approach 1:
The system uses the engine compressor as an intermediary to provide pressurized air, eliminating the need for separate atmospheric air intake that would be susceptible to icing, thereby removing the harmful effect while maintaining the desired function
4Stress or pressure
If bleed air is extracted from a higher stage of the compressor, then pressure and temperature demands are met, but the efficiency of the engine is reduced
Solution Approach 1:
The compressor is segmented into multiple bleed air extraction points (low-pressure and high-pressure ports), allowing the system to extract air at the optimal stage that balances pressure requirements with engine efficiency
Solution Approach 2:
The system uses sensors to monitor operating conditions and feedback to determine the optimal bleed air extraction point, dynamically adjusting which port is used to maximize engine efficiency while meeting pressure demands
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 approach reduces energy waste, improves engine efficiency, and decreases fuel consumption by utilizing existing compressed air, minimizing the need for precoolers and pressure regulators, while providing redundancy and reducing system complexity and weight.
Implementation Method 1
A shaft-driven compressor system that extracts and pressurizes low-pressure bleed air from aircraft engines, reducing energy waste by boosting pressure to meet system demands
Data Source
AI summary
Bleed air systems for use with aircraft and related methods are disclosed. An example apparatus includes a compressor having a compressor inlet and a compressor outlet. The compressor is to be driven by a drive shaft extending from an engine of an aircraft. The example apparatus also includes a first passageway to fluidly couple a first low-pressure bleed air port from the engine to the compressor inlet and a second passageway to fluidly couple the compressor outlet to a system of the aircraft.