Unducted Propeller Turbine Module with Dual-Casing Stator Support
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Solution Overview
Problem
Turbomachines, particularly USF turbomachines, suffer from significant noise generation due to the interaction of wake and vortex at the tips of propeller and stator blades, and their compact design is hindered by the need to maintain stator blades close to the propeller, increasing length and mass.
Innovation Solution
The stator blades are supported by two housings instead of the inlet housing, offsetting them to increase the distance from the propeller, and are connected via connecting rods, allowing for a compact design without lengthening the turbomachine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If stator blades are mounted on inlet housing close to propeller blades, then mass and size are optimized, but noise increases significantly
Solution Approach 1:
The support structure for stator blades is segmented into two separate housings (inlet housing and outlet housing) rather than being mounted on a single inlet housing. This segmentation allows the stator blades to be positioned further from the propeller blades while maintaining structural support, thereby reducing noise generation from blade interaction while preserving compact mass distribution.
2Object-generated harmful factors
If stator blades are moved away from propeller blades to reduce noise, then noise decreases, but length of turbomachine increases
Solution Approach 1:
The stator blades are nested between the inlet housing and outlet housing, with their support structure integrated into the existing housing architecture. This nesting approach allows the stator blades to be positioned away from the propeller blades for noise reduction while utilizing the available space within the housing structure, preventing overall length increase.
3Ease of repair
If stator blades are supported by two housings instead of one, then noise reduces and maintenance improves, but device complexity increases
Solution Approach 1:
The inlet housing and outlet housing serve multiple functions: they provide structural support for the stator blades, define the flow paths for the turbine, and now additionally provide mounting points for the stator blade support structure. This multi-functionality reduces the need for separate dedicated support components, thereby reducing overall structural complexity while enabling improved maintenance access.
Data Source
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AI summary
The invention relates to a turbine engine module of longitudinal axis X, comprising an unducted propeller (2) intended to be rotated around the longitudinal axis X by a power shaft (10, 11) which is connected at least to a rotor member (5, 6), at least one flow straightener (3) comprising a plurality of stator vanes (28) extending along a radial axis Z, at least one first casing (17) mounted upstream, along the longitudinal axis, of the rotor member (5, 6) and a second casing (33) mounted downstream, along the longitudinal axis, of the rotor member. According to the invention, the stator vanes (28) each comprise a root (30) housed in a sleeve (37) which is connected to the first casing (17) and to the second casing (33).