Gas Turbine Rotor Disk Temperature Detection via Sealed Cavity
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Solution Overview
Problem
In gas turbines, precise temperature detection of the rotor disk is challenging due to potential non-uniformity in the circumferential direction caused by local backflow, making effective temperature management difficult.
Innovation Solution
A gas turbine design with a seal housing and seal members that minimize the impact of combustion gas backflow on temperature detection, featuring a radially extending gas introduction path and a linear gas discharge path to detect the temperature of gas in a disk cavity between the seal housing and rotor disk rim portions, ensuring reliable temperature management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermometer is placed in the disk cavity area further upstream and further outside in the radial direction than the first upstream-side seal member, then the temperature detection point is positioned to monitor the rotor disk, but the temperature in the circumferential direction becomes non-uniform due to local backflow, making precise detection difficult
Solution Approach 1:
A detection end space is introduced as an intermediary chamber between the disk cavity and the thermometer detection end. Gas flows from the disk cavity through a gas introduction path into this detection end space, where the thermometer measures the temperature. This intermediary space isolates the thermometer from the non-uniform temperature field caused by local backflow, allowing accurate temperature measurement of the rotor disk cooling gas.
Solution Approach 2:
The detection system is segmented into distinct functional zones: the disk cavity, the gas introduction path, the detection end space, and the gas discharge path. This segmentation separates the measurement function from the flowing gas path, allowing the thermometer to measure temperature in a controlled detection end space rather than directly in the turbulent disk cavity environment.
2Ease of operation
If the thermometer detects gas temperature in the disk cavity, then temperature management of the rotor disk becomes possible, but local backflow causes circumferential temperature non-uniformity, leading to detection failures
Solution Approach 1:
The detection end space serves as a mediator that receives gas from the disk cavity through the gas introduction path. The thermometer placed in this detection end space measures the temperature of gas that has already mixed and stabilized, providing accurate temperature data for rotor disk temperature management without being affected by local backflow turbulence.
Solution Approach 2:
The gas flow itself serves the dual purpose of cooling the rotor disk and providing the medium for temperature measurement. The gas that flows through the disk cavity and enters the detection end space automatically provides the temperature information needed for monitoring, eliminating the need for separate measurement systems.
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 design reduces temperature detection failures and facilitates easy temperature management of the rotor disk by accurately measuring the temperature in a region with minimal circumferential non-uniformity, enhancing the responsiveness of temperature detection.
Implementation Method 1
The thermometer detects the temperature of gas which flows in from the introduction port of the gas introduction path
Data Source
AI summary
A gas turbine according to the invention includes a seal housing in which a leaf-shaped seal is provided and a detection end space, a gas introduction path, and a gas discharge path are also formed. The detection end space is formed at a position on the outside in a radial direction from a leaf-shaped seal, and the gas introduction path has an introduction port formed at a position further on the downstream side than the leaf-shaped seal and also has a radially extending portion extending toward the outside in the radial direction from the introduction port and an axially extending portion extending in the direction of an axis from an end portion of the radially extending portion and reaching the detection end space.