Compressor Air Bleed Duct Routing for Variable Pitch Systems
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Solution Overview
Problem
In turbojet engines, the presence of variable-pitch systems on the outer casing makes it difficult to accommodate both air bleed manifolds and their associated ducts, resulting in a limited footprint for housing equipment and accessories.
Innovation Solution
An arrangement of air bleed circuits with intersecting duct sections and an adapter piece that allows separate and non-mixing flow paths for air from moving and fixed blades, enabling efficient air collection and transport while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If air bleed manifolds and ducts are installed on the outer casing, then air collection from compressor blades is improved, but the available space for variable-pitch systems and other equipment is reduced
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of manifolds on the outer casing to a three-dimensional configuration where ducts traverse through the compressor structure. The ducts pass through the moving bladed wheel and fixed bladed wheel assemblies, utilizing the radial and axial dimensions to route air bleed paths without occupying additional circumferential space on the outer casing surface.
Solution Approach 2:
The air bleed ducts are nested within the existing compressor structure by routing them through the hollow centers of the moving and fixed bladed wheel assemblies. The ducts are positioned concentrically within the radial structure of the compressor stages, effectively utilizing the internal volume of existing components rather than adding external attachments.
2Adaptability or versatility
If variable-pitch systems are installed on the outer casing, then compressor stage adaptability is improved, but the space available for air bleed manifolds is reduced
Solution Approach 1:
The air bleed system utilizes the radial and axial dimensions by routing ducts through the depth of the compressor assembly rather than occupying circumferential space. This dimensional transition allows variable-pitch mechanisms to be positioned on the outer casing while air bleed ducts traverse internally through the compressor stages.
Solution Approach 2:
The air bleed system is segmented into separate collection points for moving blade air bleed and fixed blade air bleed, with dedicated ducts for each. This segmentation allows independent routing paths that can be optimized to avoid interference with variable-pitch systems while maintaining effective air collection from both blade types.
3Measurement precision
If separate air bleed circuits for moving and fixed blades are implemented, then air flow control precision is improved, but device complexity increases
Solution Approach 1:
The air bleed system is divided into separate circuits: one circuit collects air from the moving bladed wheel through dedicated orifices and ducts, while another circuit collects air from the fixed bladed wheel through separate orifices and ducts. This segmentation enables independent control and measurement of air flow from each blade type, improving precision while maintaining manageable complexity through modular design.
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 solution allows for the simultaneous operation of air bleed systems and variable-pitch systems, optimizing space usage and enabling the placement of additional equipment on the compressor periphery, while maintaining efficient air flow and reduced size requirements.
Implementation Method 1
said adapter piece comprising a first section of duct forming a first flow path from said moving wheel manifold to a first outlet, said first section of duct and said second section of duct having respective directions which intersect
Data Source
Figure 1
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AI summary
The arrangement has a rotor wheel controller (24) controlling air flow aspired on a revolving blade (8), and a stator wheel controller controlling the air flow aspired on a stator blade (9). The controller (24) is disposed on periphery of a compressor based on a rotor wheel (10), and the stator wheel controller is superimposed to the collector (24). Connecting tubes (32) are connected to the periphery of the compressor based on a stator wheel (12) and the stator wheel controller.