Sectored Perforation Needle Ring for 360-Degree Turbine Panel Acoustic Treatment
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Solution Overview
Problem
Current methods for perforating acoustic annular panels in turbine engines are limited to sectors with angle ranges less than 90°, making it impossible to effectively perforate panels continuously extending over 360°, which impairs the acoustic effectiveness due to angle variations and uneven perforation sizing.
Innovation Solution
A device featuring a sectored perforation needle support ring with radially mobile sectors and a rotating actuator allows for radial movement from an inner rest position to a perforation position, enabling the perforation of annular panels by guiding needles through the panel's alveolar structure, with slotted link systems and sliders ensuring non-synchronous and differential radial movement of sectors to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single needle support ring is used for perforation, then the device structure is simple, but it cannot effectively perforate annular panels continuously extending over 360° due to angle variations
Solution Approach 1:
The needle support ring is divided into multiple independent mobile sectors (typically 4 sectors covering 360°). Each sector can move radially independently to position needles at different angular positions around the annular panel, enabling continuous 360° perforation while maintaining consistent perforation parameters through individual sector control
2Adaptability or versatility
If the panel angle section is increased to cover more than 90°, then the acoustic effectiveness is improved, but the micro-perforation quality deteriorates due to angle variations during needle insertion
Solution Approach 1:
The needle support sectors are designed to be radially mobile rather than fixed. Each sector can move outward radially to the perforation position, allowing the needles to approach the panel surface perpendicularly regardless of the angular position, thereby maintaining consistent micro-perforation quality across the entire 360° coverage
3Productivity
If multiple needles are positioned simultaneously across the panel, then the productivity is improved, but the risk of needle collisions increases
Solution Approach 1:
The needle support system is segmented into multiple independent mobile sectors. Each sector moves radially independently, allowing simultaneous positioning of multiple needles across different angular positions without collision, as each sector operates in its own radial path from the center axis
Solution Approach 2:
The mobile sector structure acts as an intermediary mechanism between the central actuator and the needles. The sector translates rotational motion into radial movement, mediating the positioning of multiple needles at different angles while maintaining their spatial separation and preventing collisions
Data Source
AI summary
Device for perforating an acoustic annular panel for a turbine engine, wherein it includes a perforation needle support ring, the ring having an axis A of revolution and being intended to be inserted substantially coaxially inside the panel, the ring being sectored and including ring sectors regularly distributed around the axis and each one radially mobile opposite the axis from a radially inner rest position up to a perforation position of the radially outer panel, and at least one rotating actuator of rotation axis A and mechanically connected to the ring sectors such that a rotation of the actuator leads to a radial movement of the ring sectors.