Gas Turbine Sensor Thermal Management
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Solution Overview
Problem
Gas turbine engines operating in low-temperature environments face issues with pneumatic part freezing due to moisture accumulation, leading to blockages in burner pressure sensing systems, which can result in loss of thrust control and safety concerns, as existing methods like water traps and heaters have been inefficient in preventing freezing and moisture condensation.
Innovation Solution
A heater that contacts the sensor on multiple sides, combined with a thermal blanket and a thermal break between the EEC housing and the sensor, to increase heat delivery to critical areas while minimizing heat loss to the environment, ensuring effective prevention of freezing and condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater is used to prevent freezing in the pneumatic sensor, then the sensor temperature increases, but the heater is inefficient and does not significantly reduce air moisture condensation
Solution Approach 1:
The heater is repositioned to contact the sensor on multiple sides (front, rear, and lateral surfaces) rather than a single location, creating localized heating zones where moisture condensation is most problematic. This multi-point contact approach concentrates thermal energy where it is most needed, improving heating efficiency and preventing condensation in critical areas.
Solution Approach 2:
A thermal blanket is introduced as an intermediary insulating layer between the heater and the external environment. This thermal blanket reduces heat loss to the surrounding cold atmosphere, directing more thermal energy toward the sensor and thereby improving heater efficiency while maintaining effective temperature control.
2Reliability
If screens are added to protect the sensor from FOD and contaminants, then sensor protection improves, but the screens become a collection point for moisture preventing drainage
Solution Approach 1:
The harmful moisture accumulation problem is addressed by extracting the drainage function from the screen structure itself. Heating elements are applied directly to the sensor surfaces where moisture collects on the screens, actively removing the harmful effect through thermal prevention of condensation and freezing, rather than relying solely on passive drainage pathways.
3Temperature
If heat is provided to the sensor, then freezing prevention improves, but heat loss to the environment and mating surfaces increases
Solution Approach 1:
Heating elements are strategically positioned to contact specific surfaces of the sensor (front, rear, and lateral sides) where moisture condensation and freezing are most likely to occur. This localized heating approach concentrates thermal energy in critical zones rather than uniformly heating the entire sensor assembly, reducing overall heat loss to the environment.
Solution Approach 2:
A thermal blanket serves as an insulating intermediary between the heated sensor and the cold external environment. This thermal insulation layer reduces conductive and convective heat loss to surrounding structures and atmosphere, maintaining sensor temperature while minimizing energy consumption.
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 configuration effectively prevents freezing and condensation in pneumatic sensors, ensuring accurate pressure measurements by maintaining heat around the sensor diaphragm and reducing heat dissipation to the environment, thereby maintaining reliable thrust control.
Implementation Method 1
a heater that contacts the sensor on more than one side... an increased amount of heat is provided to critical areas
Implementation Method 2
A thermal blanket or cover over the heater... reducing heat loss dissipated to the sensor's environment and mating surfaces
Implementation Method 3
A thermal break is placed between the EEC housing and the mating surface of the sensor
Data Source
Figure 1
Figure 2~3
AI summary
A sensor for measuring gas pressure in a gas turbine engine, The sensor 17 is positioned to receive pressurized gas and measure the pressure. A thermally insulating material 19 mounts the sensor spaced from conductive portions of the engine, A heater 21 is mounted on a plurality of sides of sensor to provide heat A thermal blanket 23 covers the heater to prevent loss of sensor heat.