Propulsion System Fuel Adaptation via Dynamic VIGV Scheduling
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Solution Overview
Problem
The aviation industry faces challenges in adapting aircraft propulsion systems to fuels with varying characteristics, such as lower aromatic and sulfur content, which requires adjustments in fuel properties management and control systems.
Innovation Solution
A method and system for controlling a gas turbine engine propulsion system by obtaining fuel characteristics such as calorific value, aromatic content, and sulfur content, and adjusting the scheduling of variable inlet guide vanes (VIGVs) based on these characteristics to optimize engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional kerosene-based jet fuels are used, then the propulsion system operates with established fuel characteristics, but the system cannot adapt to fuels with different properties such as lower aromatic and sulfur content
Solution Approach 1:
The patent implements dynamic VIGV scheduling that automatically adjusts inlet guide vane positions based on detected fuel characteristics. The system transitions from static, fuel-type-specific scheduling to dynamic, real-time adaptation, allowing the propulsion system to handle multiple fuel types without manual reconfiguration.
Solution Approach 2:
The system detects fuel characteristics (aromatic content, sulfur content, calorific value) and uses these parameters to dynamically modify VIGV scheduling. By changing the control parameters based on fuel properties, the system achieves adaptability across different fuel types while maintaining optimized performance.
2Productivity
If the VIGV scheduling is adjusted for different fuel characteristics, then engine performance is optimized, but the control system requires real-time detection and processing of fuel properties
Solution Approach 1:
The system uses the engine's own operation to detect fuel characteristics. By monitoring parameters such as combustion efficiency, emissions, and performance characteristics during normal operation, the system self-determines fuel properties without requiring external laboratory analysis or complex pre-flight fuel testing.
Solution Approach 2:
The system implements feedback loops that continuously monitor engine performance parameters and use this information to infer fuel characteristics. The detected fuel properties then feed back into the VIGV scheduling control, creating a closed-loop system that automatically adapts to fuel variations.
3Ease of operation
If fixed VIGV scheduling is used for a specific fuel type, then the control system is simple, but the system cannot operate efficiently with fuels having different characteristics
Solution Approach 1:
The patent creates a universal VIGV scheduling system that can handle multiple fuel types through a single integrated control strategy. The system uses fuel characteristic detection combined with adaptive scheduling to achieve multi-functionality, eliminating the need for separate control schedules for different fuel types while maintaining ease of operation.
Data Source
AI summary
A method of determining at least one fuel characteristic of a fuel provided to a gas turbine engine of an aircraft includes making an operational change, the operational change being effected by a controllable component of a propulsion system of which the gas turbine engine forms a part, and being arranged to affect operation of the gas turbine engine, sensing a response to the operational change; and determining the at least one fuel characteristic based on the response to the operational change.