Blade Stop Ring Cooling Structure for Turbine Rotor Roots
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Solution Overview
Problem
Existing turbine rotor designs face inefficiencies in cooling and axial retention of bilobed blade roots, leading to potential heating and damage due to blocked cooling air pathways.
Innovation Solution
A rotor structure featuring a retaining ring with recesses and an annular flange that allows axial locking of blade roots while enabling efficient cooling of both radially inner and outer cavities by directing cooling air through strategically positioned orifices and recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stop ring and flange are used to axially retain blade roots in slots, then axial retention is achieved, but cooling air passage is blocked
Solution Approach 1:
The stop ring is segmented with recesses that divide the ring into sections, creating pathways for cooling air to pass through the ring structure and reach the blade root cooling channels while maintaining axial retention functionality
Solution Approach 2:
The recesses in the stop ring act as intermediary channels that facilitate the passage of cooling air from the flange side through the stop ring to the blade root, mediating between the retention function and cooling requirement
2Temperature
If cooling air is allowed to pass through the stop ring, then cooling efficiency is improved, but axial retention capability is reduced
Solution Approach 1:
The stop ring is divided into segments by recesses, allowing cooling air to pass through the gaps while the solid portions of the ring maintain contact with the blade root flange to provide axial retention
Solution Approach 2:
Different portions of the stop ring have different functions: the recessed areas allow cooling air passage while the solid protruding areas maintain axial retention, creating local functional differentiation
3Stability of the object's composition
If the stop ring has a solid structure for reliable retention, then axial locking is effective, but cooling air cannot reach the radially outer cavity
Solution Approach 1:
The stop ring is segmented with recesses that create channels for cooling air to reach the radially outer cavity of the blade root while maintaining structural integrity for axial locking
Solution Approach 2:
The stop ring simultaneously performs multiple functions: axial retention of the blade root and facilitation of cooling air passage to both inner and outer cavities through its recessed structure
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 ensures effective axial locking and cooling of blade roots, preventing displacement and damage by allowing cooling air to reach both cavities, thereby enhancing the durability and performance of turbine rotors.
Implementation Method 1
this annular flange being configured to form a space with said rotor disc and comprising at least one air-intake orifice opening into said space
Data Source
AI summary
The present invention relates to a turbine rotor (1) comprising a rotor disc (2), provided at its periphery with a plurality of axial cells (23) for receiving a bilobed root (30) of a blade (3), each cell (23) comprising a radially inner cavity (232) and a radially outer cavity (231). This rotor is characterised in that it comprises a ring (4) for axially retaining the blade roots and an annular flange (5), the ring (4) comprising a radially inner portion provided with notches (43) and being arranged against the upstream face (21) of the disc (2), so that each of its notches (43) is located opposite a cell (23) of the disc (2), the flange (5) being secured against the upstream face of the ring (4), forming a space (E) with said disc (2), and comprising at least one air-intake opening (54) which opens into said space (E), and in that each blade (3) comprises a groove (33) for receiving the outer circumferential edge (46) of said ring (4).