Turbo Machine Rotor Blade Root Contact Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In turbo machines, the gap between turbine blades and disks increases during low-speed rotation, leading to relative movement and potential damage to the root spring due to reduced centrifugal force, which compromises the adhesion structure's effectiveness in maintaining blade-disk contact.
Innovation Solution
A rotor design featuring a lifting part within the cooling cavity that presses the root member radially outward and a supporting part to absorb loads during low-speed rotation, ensuring tight contact between the blade and disk while preventing deformation of the lifting part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the root spring is used to maintain blade-disk contact during low-speed rotation, then the adhesion structure provides blade-disk contact, but the root spring is deformed and damaged due to reduced centrifugal force
Solution Approach 1:
A root bar is introduced as an intermediary component between the root spring and the blade. The root bar absorbs and distributes the load during low-speed rotation, preventing direct transmission of excessive force to the root spring. This mediator structure allows the root spring to maintain blade-disk contact while protecting it from deformation and damage.
2Ease of manufacture
If clearance is designed in the turbine disk slot for assembly and thermal expansion, then assembly work is facilitated and thermal expansion is accommodated, but the gap increases during low-speed rotation causing relative movement between blade and disk
Solution Approach 1:
The root bar is designed with dynamic load-bearing characteristics that adapt to different rotational speeds. During high-speed rotation, centrifugal force maintains blade-disk contact. During low-speed rotation, the root bar dynamically engages to compensate for the clearance, preventing relative movement while allowing the clearance to exist for assembly and thermal expansion purposes.
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 maintains tight contact between the blade and disk, reducing the load on the root spring and preventing damage, thereby enhancing the operational stability and longevity of the turbo machine components.
Implementation Method 1
a lifting part installed in the cooling cavity and configured to press the root member radially outward
Implementation Method 2
a supporting part installed in the cooling cavity, disposed in contact with the lifting part, and configured to support the lifting part
Implementation Method 3
During the operation of a turbo machine, each blade comes into close contact with the disk due to strong centrifugal force
Data Source
AI summary
A rotor and a turbo machine including the same are provided. The rotor includes a disk including a disk slot, a blade including a root member inserted into the disk slot and an airfoil disposed radially outside the root member, and configured to form a cooling cavity between an inner surface of the disk slot and the root member, a lifting part installed in the cooling cavity and configured to press the root member in a radially outward direction, and a supporting part installed in the cooling cavity, disposed in contact with the lifting part, and configured to support the lifting part.