Fiber Optic Pressure Transducer for Combustion Dynamics Monitoring
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Solution Overview
Problem
Gas turbine engines face instability issues due to combustion dynamics, leading to component failures and inefficiencies, particularly with low nitrous oxide techniques, which cause oscillations, rumble, and high-frequency dynamics, resulting in costly maintenance and potential safety hazards.
Innovation Solution
A temperature-tolerant fiber optic pressure transducer system is positioned within the gas turbine engine to monitor combustion dynamics, using a diaphragm with a reflective surface and a partially reflective window forming a Fabry-Perot gap, coupled with an optical fiber to analyze pressure pulsations and provide real-time feedback to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If dry low nitrous oxide techniques are used, then emissions are reduced, but combustion stability deteriorates causing oscillations and rumble
Solution Approach 1:
The monitoring system performs preliminary detection of combustion instability conditions before they escalate into dangerous oscillations. By continuously measuring pressure dynamics and detecting early signs of instability, the system enables preemptive control actions to maintain stable combustion while using low nitrous oxide techniques.
Solution Approach 2:
The system implements continuous feedback monitoring of combustion dynamics through pressure transducers positioned in the combustion zone. Real-time data on pressure oscillations and combustion stability is fed back to control systems, enabling dynamic adjustment of operating parameters to maintain stability during low nitrous oxide operation.
2Measurement precision
If monitoring apparatus is positioned within the combustion zone, then measurement accuracy is improved, but the apparatus is exposed to high temperatures causing damage
Solution Approach 1:
The patent employs an intermediary acoustic waveguide that transmits pressure oscillations from the high-temperature combustion zone to the transducer diaphragm. The waveguide acts as a mediator, allowing accurate measurement of combustion dynamics while keeping the sensitive transducer components outside the direct high-temperature environment.
Solution Approach 2:
The system replaces direct mechanical exposure to high temperatures with an acoustic field transmission method. Pressure oscillations are transmitted through the acoustic waveguide as acoustic energy rather than direct thermal-mechanical coupling, protecting the transducer from thermal damage while maintaining measurement accuracy.
3Ease of manufacture
If traditional pressure transducers are used, then manufacturing is simpler, but they cannot withstand high temperatures in the combustion zone
Solution Approach 1:
The transducer incorporates temperature-tolerant materials and composite construction, including specialized diaphragm materials and protective coatings that can withstand high-temperature combustion zone environments. The acoustic waveguide is constructed from materials that maintain structural integrity and acoustic transmission properties at elevated temperatures.
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
The system continuously monitors combustion dynamics, detecting instability and providing warnings to prevent component failure, reducing maintenance costs and emissions, while ensuring stable operation and efficient power generation.
Implementation Method 1
The optical fiber is positioned proximate to the window and directs light into the Fabry-Perot gap and receiving light reflected from the Fabry-Perot gap
Implementation Method 2
The transducer includes a diaphragm, a window, and a Fabry-Perot gap. The diaphragm has a reflective surface, and the window has a partially reflective surface. The Fabry-Perot gap is formed between the reflective surface of the diaphragm and the partially reflective surface of the window
Data Source
AI summary
Apparatus, methods, and other embodiments associated with monitoring combustion dynamics in a gas turbine engine environment are described herein. In one embodiment of a system for monitoring combustion dynamics in a gas turbine engine environment, the system includes a transducer and an optical fiber. The transducer is positioned within the gas turbine engine environment, and the transducer includes a diaphragm, a window, and a Fabry-Perot gap. The diaphragm has a reflective surface, and the window has a partially reflective surface. The Fabry-Perot gap is formed between the reflective surface of the diaphragm and the partially reflective surface of the window. The optical fiber is positioned proximate to the window and directs light into the Fabry-Perot gap and receiving light reflected from the Fabry-Perot gap.