Fuel Cell Aircraft Blower Control Under Changing Outside Air
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Solution Overview
Problem
Aircrafts equipped with fuel cell systems face challenges in efficiently controlling air flow rates into the fuel cell system due to varying outside air conditions, such as altitude, temperature, and air density, which affect propulsion and energy conversion efficiency.
Innovation Solution
The aircraft is equipped with a controller that adjusts the blower's rotation rate based on outside air conditions, including altitude, temperature, and cruising speed, to optimize air flow into the fuel cell system, and includes an air recirculation loop to manage oxygen concentration, ensuring efficient energy generation and propulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the air flow rate into the fuel cell system is increased to improve energy conversion efficiency, then power output increases, but system complexity increases due to the need for dynamic control mechanisms
Solution Approach 1:
The patent implements dynamic control of the air supply device based on real-time operating conditions. The controller adjusts the air flow rate dynamically according to the aircraft's cruising speed, altitude, and temperature, allowing the fuel cell system to optimize power output while adapting to varying flight conditions rather than using a fixed air supply system
Solution Approach 2:
The patent employs a feedback control mechanism where the controller receives information about outside air conditions (temperature, pressure, cruising speed) and adjusts the air supply device accordingly. This closed-loop control system automatically optimizes air flow to maintain efficient operation without requiring manual intervention or complex manual control systems
2Loss of energy
If the air flow rate is dynamically adjusted to optimize energy conversion efficiency, then fuel consumption decreases, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The controller serves multiple functions: it monitors outside air conditions (temperature, pressure), calculates optimal air flow rates based on cruising speed and altitude, controls the air supply device, and manages the recirculation loop. By consolidating these functions into a single control unit, the patent reduces overall system complexity while achieving energy optimization
Solution Approach 2:
The system automatically adjusts air flow rates based on real-time operating conditions without requiring external intervention. The controller self-regulates the air supply and recirculation based on pre-programmed optimization algorithms, allowing the system to serve itself and optimize fuel consumption autonomously
3Power
If the blower rotation rate is increased to improve air supply to the fuel cell stack, then electrical energy generation increases, but energy consumption by the blower increases
Solution Approach 1:
The patent dynamically changes the blower's rotation rate parameter based on operating conditions. Rather than maintaining a constant high rotation rate, the controller adjusts the rotation speed to match the actual air demand of the fuel cell stack, optimizing the balance between air supply and energy consumption by the blower
4Productivity
If an air recirculation loop is added to manage oxygen concentration, then energy conversion efficiency improves, but device complexity increases
Solution Approach 1:
The patent combines the air supply function and air recirculation function into a single integrated system. The same blower and controller manage both fresh air intake and recirculated air mixing, allowing the system to improve oxygen concentration management and energy efficiency while avoiding the complexity of completely separate air management systems
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 the aircraft's energy conversion efficiency and propulsion stability by dynamically adjusting air flow rates and recirculating air, thereby improving overall system performance and reducing fuel consumption.
Implementation Method 1
a fuel cell system that produces electricity through a redox reaction between hydrogen and oxygen
Implementation Method 2
a blower located at a rear end of the inlet portion, and the rate of rotation of the blower is controlled based on the density of the outside air
Data Source
AI summary
An aircraft includes a fuselage extending in a front-rear direction of the aircraft, main wings extending from sides of the fuselage, a fuel cell system located adjacent to a rear of the fuselage with respect to the main wings and configured to apply driving force to a nacelle located on each of the main wings, and a controller configured to transmit electrical energy applied from the fuel cell system to the nacelle. A center of gravity of the aircraft is located in the fuselage close to front ends of the main wings, and a flow rate of air flowing into the fuel cell system is controlled in response to an outside air condition of the aircraft.