Torch Ignitor Self-Cleaning via Fuel-Lean Oxidation
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Solution Overview
Problem
Conventional maintenance techniques for torch ignitors in gas turbine engines are inadequate in preventing excessive carbon growth, which can lead to performance deterioration and component erosion due to uncontrolled carbon deposition on internal surfaces.
Innovation Solution
A method involving a fuel-lean flow through the combustion chamber of the torch ignitor, combined with heating of interior surfaces, is used to reactively remove carbon deposits, performed intermittently during flight or as part of engine shutdown and maintenance cycles, with a subsequent air-fuel mixture adjustment to maintain optimal combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torch ignitor operates in a fuel rich mixture for continuous ignition, then reliable ignition is achieved, but carbon deposits accumulate on internal surfaces deteriorating performance
Solution Approach 1:
The system implements periodic switching between fuel-rich mode (for reliable ignition) and fuel-lean mode (for carbon removal). The control system alternates the torch ignitor operation between these two fuel-air ratio conditions, allowing carbon deposits to be removed during the fuel-lean phases while maintaining ignition reliability during fuel-rich phases.
Solution Approach 2:
The system converts the harmful carbon deposit formation into a beneficial self-cleaning process. By intentionally operating in fuel-lean mode periodically, the carbon deposits that formed during fuel-rich operation are burned off as part of the normal operation cycle, transforming the harmful accumulation into a controlled cleaning mechanism.
2Ease of manufacture
If conventional maintenance techniques are used for torch ignitors, then basic maintenance is performed, but excessive carbon growth cannot be prevented
Solution Approach 1:
The torch ignitor system performs its own maintenance by automatically switching to fuel-lean mode to remove carbon deposits during normal operation. This self-cleaning capability eliminates the need for external maintenance interventions and prevents performance deterioration without requiring additional maintenance complexity.
3Ease of operation
If carbon deposits are allowed to grow uncontrolled, then operational simplicity is maintained, but performance deteriorates and components erode
Solution Approach 1:
The system dynamically adjusts the fuel-air ratio based on operational requirements. The control system monitors and switches between fuel-rich and fuel-lean modes, making the fuel-air mixture dynamic rather than static. This allows the system to optimize between ignition reliability and carbon removal without requiring complex manual intervention.
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 self-cleaning cycle effectively reduces and prevents carbon buildup on torch ignitor surfaces, ensuring continuous ignition performance and preventing downstream component erosion, allowing for extended operational periods and reduced maintenance needs.
Implementation Method 1
heating interior surfaces of the torch ignitor, wherein the fuel-lean flow reacts with carbon deposits on the interior surfaces to remove the carbon deposits
Implementation Method 2
heating interior surfaces of the torch ignitor, wherein the fuel-lean flow reacts with carbon deposits on the interior surfaces to remove the carbon deposits
Data Source
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AI summary
A method of operating and cleaning a torch ignitor (101) for continuous ignition includes issuing a fuel-lean flow through a combustion chamber (104) of a torch ignitor. The method also includes heating interior surfaces of the torch ignitor (101), wherein the fuel-lean flow reacts with carbon deposits on the interior surfaces to remove the carbon deposits.