Gas Turbine Tie-Bolt Clamping Member Vibration Damping
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Solution Overview
Problem
Gas turbines face challenges in supporting high-speed tie-bolts and efficiently transferring low-temperature, low-pressure cooling air from the compressor rotor to the turbine rotor, leading to vibration issues and reduced cooling performance.
Innovation Solution
A clamping member is arranged in the cooling air flow path on the outer circumference of the tie-bolt, which supports the tie-bolt, pressurizes the cooling air, and transfers it to the turbine rotor, enhancing vibration absorption and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a support wheel is provided in a hollow shaft to support the tie-bolt, then the tie-bolt can be supported during rotation, but it becomes difficult to form a flow path for transferring low-temperature air from the compressor rotor to the turbine rotor for cooling purposes
Solution Approach 1:
The support function is divided into multiple clamping members distributed around the tie-bolt circumference rather than a single support wheel. This segmentation allows cooling air flow paths to be formed in the gaps between clamping members, simultaneously achieving support stability and cooling functionality
Solution Approach 2:
The clamping members serve multiple functions: they support the tie-bolt during rotation, maintain the spacing between rotor components, and enable cooling air flow paths for turbine rotor cooling. This multi-functionality resolves the contradiction by integrating support and cooling functions into a single structural solution
2Productivity
If the gas turbine size and efficiency are increased, then overall performance improves, but the tie-bolt rotation at high speed becomes difficult to support
Solution Approach 1:
The clamping members are designed to dynamically follow the tie-bolt during high-speed rotation, maintaining continuous contact and support. This dynamic adaptation allows the support system to function effectively at the higher speeds required for improved gas turbine efficiency
3Reliability
If a support unit is positioned in the space between the compressor rotor and turbine rotor along the central axis, then the tie-bolt can be supported, but it is difficult to position in the space where combustors are radially arranged
Solution Approach 1:
Instead of positioning support units along the central axis (one-dimensional approach), the clamping members are distributed around the circumferential dimension of the tie-bolt. This dimensional shift allows support functionality while accommodating the radial arrangement of combustors without interference
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
The solution effectively reduces vibrations and improves cooling performance by pressurizing and transferring cooling air from the compressor rotor to the turbine rotor, increasing the overall efficiency of the gas turbine.
Implementation Method 1
the clamping member may be rotated to pressurize the cooling air
Data Source
AI summary
An exemplary gas turbine includes a rotor unit, a tie-bolt, a cooling air pipe, and a clamping member. The rotor unit includes rotor blades and rotor disks. The rotor blades are arranged on outer circumferential surfaces of the rotor blades. The tie-bolt extends along the central axis of the rotor unit through the rotor disks and fastens the rotor disks. The cooling air pipe has the tie-bolt arranged therethrough and forms a ring-shaped cooling air flow path in an internal space thereof with the tie-bolt through which a cooling air is passed. The clamping member is arranged in the ring-shaped cooling air flow path so as to support the tie-bolt with respect to the cooling air pipe.