Turbomachine Rotor Cooling Slots and Guide Grooves
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Solution Overview
Problem
Current cooling structures in turbomachines face challenges in efficiently directing cooling fluid flow between the rotor wheel and buckets, leading to suboptimal cooling effects due to narrow gaps and undesired fluid flow directions, which increases maintenance workload and reduces cooling efficiency.
Innovation Solution
The proposed cooling structure incorporates dovetail joint parts with mounting grooves and cooling slots along the rotor wheel's outer surface, featuring various cross-sectional shapes and inclined portions to enhance fluid flow, along with guide grooves and locking strips to concentrate fluid flow through specific paths, and includes cooling wheel holes to improve heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the gap between the rotor wheel and bucket is adjusted to improve cooling fluid flow, then the cooling effect is improved, but the maintenance workload increases because the turbine must be disassembled to adjust locking key positions
Solution Approach 1:
The invention divides the cooling structure into separate components: cooling slots are formed directly on the rotor wheel, and guide grooves are provided on the bucket. This segmentation allows the cooling fluid flow path to be defined by the structure itself rather than by adjustable gaps, eliminating the need for maintenance adjustments while maintaining effective cooling.
Solution Approach 2:
The cooling structure is designed to be self-regulating through the fixed geometric relationship between the cooling slots on the rotor wheel and guide grooves on the bucket. The cooling fluid flow is automatically directed through the predetermined path without requiring external adjustment or maintenance intervention.
2Stability of the object's composition
If constant gaps are machined between the dovetail and rotor wheel for thermal expansion, then thermal expansion is accommodated, but cooling fluid flows in undesired directions reducing cooling efficiency
Solution Approach 1:
The invention applies different functional qualities to different regions: the cooling slots provide dedicated cooling fluid passages with controlled geometry, while the guide grooves direct the fluid flow. This localized functional differentiation ensures that thermal expansion gaps do not compromise cooling efficiency, as the cooling fluid is channeled through the predetermined slots and grooves rather than flowing randomly through thermal expansion gaps.
Solution Approach 2:
The guide grooves act as intermediary structures that intercept and redirect the cooling fluid flow. Instead of allowing cooling fluid to flow freely through thermal expansion gaps in undesired directions, the guide grooves mediate the flow path, directing the fluid through the intended cooling regions between the dovetail and rotor wheel.
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 significantly enhances the cooling effect by directing the cooling fluid flow more effectively, increasing the cooling area and efficiency, while reducing maintenance requirements by allowing for improved assembly and operation of turbomachines.
Implementation Method 1
cooling slots disposed along the outer circumferential surface of the rotor wheel on the dovetail joint part and having a cooling fluid flowing therethrough
Data Source
AI summary
The present invention relates to a structure for cooling a turbomachine's rotor part and a rotor and a turbomachine having the same. The structure for cooling a turbomachine's rotor part includes: a dovetail joint part disposed along an outer circumferential surface of a rotor wheel and having a plurality of mounting grooves in which dovetails of buckets are mounted and cooling slots disposed along the outer circumferential surface of the rotor wheel on the dovetail joint part and having a cooling fluid flowing therethrough.