Fuel Temperature Control System for Turbine Engine Combustor Stability
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Solution Overview
Problem
In gas turbine engines, fuel boiling within the combustor leads to instability and a propensity for flameout, particularly due to variations in fuel composition and temperature, which existing systems struggle to manage effectively.
Innovation Solution
A fuel temperature control system with sensors and a controller that adjusts the fuel temperature at the nozzle inlet to maximize fuel temperature while minimizing boiling, using a combination of sensors for real-time data input and a heater to maintain optimal fuel conditions, thereby accommodating fuel property variations and ensuring stable engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel temperature is increased to maximize combustion efficiency, then engine efficiency is improved, but fuel boiling occurs leading to system instability and flameout
Solution Approach 1:
The system employs a feedback control mechanism where a temperature sensor continuously monitors fuel temperature and a controller adjusts the heater element accordingly. When fuel temperature approaches the boiling point, the controller reduces or shuts off heating, preventing boiling while maximizing combustion efficiency. This closed-loop control resolves the contradiction by dynamically balancing temperature for efficiency while preventing instability through real-time monitoring and adjustment.
Solution Approach 2:
The system changes the physical parameter of fuel temperature dynamically during operation. By using a heater element controlled by a controller to adjust temperature based on sensor feedback, the system optimizes fuel temperature for combustion efficiency while preventing it from reaching boiling points that would cause instability and flameout.
2Reliability
If fuel temperature is decreased to prevent boiling, then fuel system stability is improved, but combustion efficiency is reduced
Solution Approach 1:
The feedback control system prevents excessive cooling by continuously monitoring fuel temperature and activating the heater when temperature drops below optimal combustion levels. This ensures fuel remains warm enough for efficient combustion while preventing boiling, resolving the contradiction between stability and efficiency.
Solution Approach 2:
The heater element provides preliminary heating to fuel before it reaches the combustor, ensuring fuel is at optimal temperature for combustion. This preliminary action prevents the need to overcool fuel for stability, as the heater proactively maintains temperature within the optimal range before combustion occurs.
3Adaptability or versatility
If existing fuel temperature control methods are used, then system simplicity is maintained, but ability to accommodate fuel property variations is insufficient
Solution Approach 1:
The feedback control system with temperature sensor and controller automatically adapts to different fuel types and their varying boiling points. The system monitors actual fuel temperature and adjusts heating accordingly, eliminating the need for manual adjustments or complex pre-programming for different fuel properties. This resolves the contradiction by providing high adaptability through a relatively simple feedback mechanism.
Solution Approach 2:
The control system performs self-adjustment based on real-time temperature measurements. The sensor monitors fuel temperature and the controller automatically modulates the heater to maintain optimal temperature regardless of fuel type variations. This self-service capability provides high adaptability to different fuel properties without requiring complex external control mechanisms.
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 effectively reduces fuel system instability and flameout risks, enhancing engine efficiency by allowing higher temperature fuel combustion and accommodating different fuel types and operating conditions.
Implementation Method 1
a heater to maintain optimal fuel conditions
Data Source
AI summary
A fuel temperature control system and a method of controlling a fuel temperature for a turbine engine including supplying an aviation fuel to a fuel nozzle fluidly coupled to a combustion chamber. A fuel temperature sensor for determining at least one input parameter to define an inlet fuel temperature of the aviation fuel in the fuel nozzle. A controller for receiving the at least one input parameter and for calculating a calculated flow number in the fuel nozzle. The controller capable of comparing the calculated flow number and a reference flow number associated with a threshold during a steady state condition to determine if the aviation fuel is boiling inside the fuel nozzle.