Fluid Temperature Measurement Device Using Low Thermal Mass Substrate
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Solution Overview
Problem
Existing temperature measurement devices in gas turbine engines face challenges such as high thermal inertia, incomplete fluid temperature measurement, expensive installation, and calibration issues, as they typically measure component temperatures rather than fluid temperatures, leading to inaccurate and costly monitoring.
Innovation Solution
A fluid flow temperature measuring device with a substrate of lower thermal capacity than the component, featuring temperature recording media like wax-based thermal tabs and thermal paints applied to both sides of a thin metallic substrate, spaced apart from the component, and optionally shielded with a radiation shield or low emissivity coating to directly measure fluid temperature with reduced thermal influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature measurement device is attached to a component wall to measure fluid temperature, then the device can be installed and provide measurements, but the thermal inertia of the component causes delayed response to rapid temperature changes
Solution Approach 1:
The invention extracts the temperature sensing function from the component wall itself and places it on a separate substrate with lower thermal mass that is exposed to the fluid flow. This allows the measurement device to respond rapidly to temperature changes without being constrained by the thermal inertia of the thick component wall.
Solution Approach 2:
The invention creates a localized measurement zone on the substrate that is specifically designed with low thermal capacity materials and direct fluid exposure. This local region responds quickly to temperature changes while the rest of the system maintains its structural integrity.
2Measurement precision
If conventional temperature measurement devices are used on component walls, then measurements can be obtained, but system calibration and signal conditioning are time consuming and expensive
Solution Approach 1:
The invention employs a disposable substrate with temperature-sensitive paint that can be easily applied and removed. This eliminates the need for complex calibration procedures and signal conditioning equipment, significantly reducing installation time and cost while maintaining measurement capability.
Solution Approach 2:
The invention replaces complex electronic temperature sensing systems with a visual temperature-sensitive paint system. The temperature measurements are obtained through optical observation of paint color changes rather than electrical signal processing, eliminating the need for signal conditioning equipment.
3Measurement precision
If temperature measurement devices are attached to components, then measurements can be taken, but the expense of installation and equipment is high
Solution Approach 1:
The invention uses inexpensive substrate materials and temperature-sensitive paints that can be purchased at low cost. The simple application process requires minimal specialized equipment, dramatically reducing installation expenses compared to conventional electronic temperature sensing systems.
Solution Approach 2:
The invention uses temperature-sensitive paint that visually copies temperature distribution patterns through color changes. This optical copying method eliminates the need for expensive electronic sensors and signal processing equipment while providing accurate temperature measurement.
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 precise, rapid temperature measurement of fluids with reduced calibration needs, lower costs, and improved robustness, allowing for accurate monitoring of fluid temperature changes, including transient conditions, without the need for extensive routing and readout equipment.
Implementation Method 1
the device comprises a substrate, of lower thermal capacity than the component, having applied thereto a temperature recording media
Implementation Method 2
the temperature recording media is any one of the group comprising a wax based thermal tab and a thermal paint
Data Source
AI summary
A temperature measuring arrangement measures the temperature of a fluid passing a component. The arrangement includes a temperature measuring device having a substrate of low thermal capacity that has applied thereto two or more temperature recording media. The device is attached to and spaced apart from the component and is in the fluid flow.