Bleed Air Turbine Generator for Aircraft ECS Pressure Control
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Solution Overview
Problem
Aircraft environmental control systems (ECS) face challenges in efficiently regulating airflow and pressure, particularly during varying flight conditions, where the pressure from low-pressure bleed ports may not be sufficient, leading to inadequate air supply for cooling and conditioning in the cabin.
Innovation Solution
Incorporating a turbine generator system that utilizes high and low-pressure bleed air to drive a turbine, which regulates pressure and airflow, optionally with a variable area exhaust nozzle and a battery or flywheel for energy storage, to ensure consistent power generation and reduced load on the gas turbine engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow and pressure regulating valves are used to reduce airflow and pressure from bleed ports, then air can be conditioned and supplied to the cabin, but the pressure from low-pressure bleed ports may not be sufficient during varying flight conditions, leading to inadequate air supply
Solution Approach 1:
The patent applies a turbine-driven dynamic pressure regulation system that actively adjusts airflow based on flight conditions. The turbine connected to the generator creates a dynamic expansion mechanism that maintains sufficient pressure at low-pressure bleed ports during varying flight phases, resolving the insufficiency of static valve-based pressure reduction systems.
Solution Approach 2:
The system changes the operational parameters by using turbine expansion to actively manage pressure and flow characteristics. The turbine conversion process transforms high-pressure bleed air into controlled lower-pressure airflow, ensuring adequate pressure delivery to the cabin while enabling power generation, thus adapting to varying flight conditions.
2Power
If a turbine generator system is incorporated to drive the turbine with bleed air, then power generation and airflow regulation are improved, but the device complexity increases
Solution Approach 1:
The turbine generator system serves multiple functions simultaneously: it generates electrical power for the aircraft, regulates airflow to the cabin, and provides dynamic pressure control. This multi-functionality justifies the added complexity by consolidating power generation and environmental control into a single integrated system rather than separate components.
Solution Approach 2:
The patent merges the power generation system with the environmental control system by using the same turbine and airflow path for both purposes. The bleed air that would otherwise only serve cabin conditioning is instead expanded through a turbine to simultaneously generate electricity and provide controlled airflow, reducing overall system complexity despite the added turbine component.
3Power
If high-pressure bleed air is used to drive the turbine, then sufficient power and airflow are generated, but the load on the gas turbine engine increases
Solution Approach 1:
The system converts what would be wasted high-pressure bleed air into useful power generation and improved airflow control. By extracting energy from the high-pressure bleed stream through the turbine, the system transforms a potential energy loss into beneficial electrical power and enhanced cabin air delivery, offsetting the engine load through overall system efficiency improvements.
Solution Approach 2:
The turbine generator system uses the aircraft's own bleed air resources to generate power and regulate airflow, creating a self-sufficient subsystem. The high-pressure bleed air that passes through the turbine serves dual purposes: driving the turbine for power generation and providing the working fluid for cabin conditioning, thereby serving the system's own needs without additional external energy input.
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 solution enhances cooling efficiency, reduces the size of cooling components, and provides reliable power generation across different flight phases, improving the overall performance and efficiency of the ECS by managing airflow and pressure effectively.
Implementation Method 1
Incorporating a turbine generator system that utilizes high and low-pressure bleed air to drive a turbine, which regulates pressure and airflow
Implementation Method 2
drive a turbine, which regulates pressure and airflow... to ensure consistent power generation
Implementation Method 3
optionally with a variable area exhaust nozzle... to ensure consistent power generation
Implementation Method 4
optionally with a variable area exhaust nozzle and a battery or flywheel for energy storage
Data Source
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AI summary
An environmental control power generation system is provided. The system may include a turbine and a generator. The system may be configured to provide air form a high pressure bleed port and/or a low pressure bleed port to the turbine. The turbine may be configured to reduce the pressure of the supplied air and generate power through the generator. The power may be supplied to an aircraft power distribution system.