Nacelle Compartment Overpressure Detection via Temperature Inference
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Solution Overview
Problem
The existing systems for detecting overpressure in gas turbine nacelles, particularly in fire zones, face a 'gap' where leakage can cause critical pressure increases undetected by temperature-based fire warning systems, leading to potential nacelle breach, necessitating costly weight additions for structural reinforcement.
Innovation Solution
A method that measures and compares compartment temperatures to determine actual gas pressure, using reference temperatures and operating conditions to assess and monitor for overpressure, allowing for early detection and mitigation without relying on pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature-based fire warning systems are used to detect overpressure, then the system complexity is reduced, but the detection precision is insufficient to detect critical pressure increases before they cause nacelle breach
Solution Approach 1:
The patent replaces direct pressure sensing (mechanical system) with temperature-based detection (thermal system). By measuring temperature changes in the compartment and using thermodynamic relationships, the system infers pressure conditions without requiring pressure sensors, thus reducing system complexity while maintaining detection capability
Solution Approach 2:
The patent changes the detection parameter from direct pressure measurement to temperature measurement. By monitoring temperature variations and applying thermodynamic principles, the system detects pressure changes indirectly through temperature changes, achieving detection precision sufficient for safety applications while avoiding complex pressure sensing equipment
2Reliability
If structural reinforcement is added to withstand undetected overpressure, then the reliability is improved, but the weight of the nacelle increases significantly
Solution Approach 1:
The patent implements preliminary detection of overpressure conditions through temperature monitoring before critical pressure levels are reached. By detecting early signs of pressure buildup and triggering warnings or mitigation actions in advance, the system prevents the need for excessive structural reinforcement, thereby maintaining reliability while minimizing weight
Solution Approach 2:
The patent establishes a feedback loop where temperature measurements provide continuous information about compartment pressure conditions. This feedback enables real-time monitoring and early warning, allowing the system to respond to developing overpressure situations before they require heavy structural reinforcement, thus optimizing the balance between reliability and weight
3Productivity
If ventilation outlets are sized to handle maximum leakage, then the productivity is improved, but the noise and drag increase
Solution Approach 1:
The patent enables dynamic sizing of ventilation outlets by providing real-time information about actual leakage conditions through temperature-based pressure detection. Instead of using fixed oversized outlets designed for maximum potential leakage, the system allows outlet size to be optimized based on actual operating conditions, thereby maintaining ventilation capacity while reducing noise and drag from excessively large openings
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 method effectively detects overpressure without additional sensors, reducing structural weight and noise, and enables timely action to prevent nacelle breaches, optimizing ventilation outlet sizes and improving structural integrity.
Implementation Method 1
measuring the temperature inside the compartment with a temperature sensor
Implementation Method 2
using the measured temperature and reference temperature for the compartment to assess the gas pressure inside the compartment
Data Source
AI summary
A method, for detecting overpressure inside a compartment associated with a gas turbine nacelle, includes: a) measuring one or more predetermined operating conditions nominally affecting the temperature inside the compartment; b) determining a reference temperature for the compartment, corresponding to a nominal reference zone pressure, on the basis of the measured operating condition or conditions; c) measuring the actual temperature inside the compartment, corresponding to the actual compartment pressure; and d) using the measured actual temperature in the compartment and the determined reference temperature for the compartment to assess the gas pressure inside the compartment. A system for assessing the gas pressure inside the compartment caused by an associated pressure system failure includes using a quantified mass leakage flow to assess gas pressure inside the compartment. The quantified mass leakage flow may also be used to detect excessive mass leakage flow by comparing the quantified mass leakage flow with a predetermined mass flow leakage.