Coaxial Conduit Leak Detection Using Capacitive Dielectric Gaps
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Solution Overview
Problem
Existing leak detection systems in jet turbine engines are costly, heavy, and require dedicated sensors, necessitating a more efficient and lightweight solution.
Innovation Solution
A capacitive monitoring system using a coaxial inner and outer conduit configuration with a dielectric gap to detect leaks by measuring changes in capacitance between the conduits, utilizing a protective dielectric layer to prevent shorting and fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated leak detection sensors are used, then leak detection reliability is improved, but device complexity and weight increase
Solution Approach 1:
The patent applies multi-functionality by making the conduit serve dual purposes: fluid transport and leak detection. The conduit itself is configured as a capacitor with the outer conduit, eliminating the need for separate dedicated sensors. This resolves the contradiction by integrating the detection function into an existing component, thereby improving reliability without increasing device complexity.
Solution Approach 2:
The conduit performs self-detection of leaks by utilizing its own structural properties as a capacitor. The system monitors its own integrity through capacitive coupling between the inner and outer conduits, eliminating the need for external dedicated sensing systems. This self-service approach improves reliability while avoiding additional complexity.
2Reliability
If dedicated leak detection sensors are used, then leak detection reliability is improved, but weight increases
Solution Approach 1:
The conduit is designed to perform both fluid transport and leak detection functions simultaneously. By using the conduit's own structure as the sensing element through capacitive coupling, the system eliminates the need for additional sensor components that would increase weight. This multi-functional design achieves reliable leak detection without weight penalty.
Solution Approach 2:
The system uses the conduit itself as the detection sensor, eliminating the need for separate sensing components. The capacitive properties of the conduit structure are exploited for leak detection, meaning no additional sensors weighing extra mass are required. This self-service approach maintains reliability while minimizing weight.
3Reliability
If conservative mechanical design is used, then reliability is improved, but productivity and performance are reduced
Solution Approach 1:
The patent implements preliminary action by detecting leaks at their earliest stages through continuous capacitive monitoring. By identifying leaks before they escalate to catastrophic failures, the system allows for planned maintenance and shutdowns rather than requiring overly conservative design margins. This enables more aggressive, efficient mechanical designs while maintaining high reliability through early leak detection.
Solution Approach 2:
The system provides continuous feedback on conduit integrity through capacitive monitoring. This real-time information allows operators to respond to actual conditions rather than relying on conservative static design assumptions. The feedback mechanism enables optimized performance and productivity by allowing designs to operate closer to their true limits while maintaining safety through active monitoring.
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
Enables efficient leak detection without additional sensors, reduces weight, and allows for less conservative mechanical designs, providing timely shutdown before catastrophic failure.
Implementation Method 1
A capacitive value defined between the inner conduit and the outer conduit defines a first capacitive value when the inner conduit is not leaking the fluid into the dielectric gap between the inner conduit and the outer conduit and defines a second capacitive value when the inner conduit is leaking the fluid into the dielectric gap
Implementation Method 2
A protective dielectric layer is located between the inner conduit and the outer conduit to prevent the inner conduit from shorting to the outer conduit
Data Source
AI summary
An apparatus for providing leakage monitoring comprises an inner conduit configured to conduct a fluid therethrough. An outer conduit is coaxially located with the inner conduit and surrounds the inner conduit. The inner conduit and the outer conduit define a dielectric gap therebetween. A capacitive value defined between the inner conduit and the outer conduit defines a first capacitive value when the inner conduit is not leaking the fluid into the dielectric gap between the inner conduit and the outer conduit and defines a second capacitive value when the inner conduit is leaking the fluid into the dielectric gap between the inner conduit and the outer conduit.