Turbomachine Fuel Injection Device Axial Air Supply
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Solution Overview
Problem
In turbomachines with multi-head or single-head chambers of reduced primary zone height, the limited space restricts the integration of high permeability bowls, leading to insufficient air supply to the injection holes due to increased radial bulk of tendrils, making it impossible to provide air to the insertion holes.
Innovation Solution
An injection device with a bowl and support ring design, featuring a flared wall with air introduction holes, a first cylindrical part with a smaller diameter connected to a second cylindrical part with a radial protrusion, allowing for a reduced overall size while maintaining air supply and cooling, and support lugs that do not obstruct the introduction holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high permeability bowls with larger tendrils are used to increase air supply, then air permeability is improved, but radial bulk increases making integration impossible in reduced primary zone height chambers
Solution Approach 1:
The patent repositions the air introduction holes from the radial direction (in the bowl wall) to the axial direction (in the flared wall extension). This dimensional change allows air to be supplied to the injection holes without requiring large radial tendrils, thus resolving the contradiction between air supply quantity and radial bulk.
Solution Approach 2:
The bowl is segmented into distinct functional zones: the cylindrical wall for structural support, the flared wall for air introduction, and the tendrils for fuel injection. This segmentation allows each component to be optimized independently, with the flared wall providing axial air supply without increasing radial bulk.
2Volume of moving object
If the diameter of the contact surface between bowl and deflector is reduced to fit constrained spaces, then integration in reduced primary zone height chambers is enabled, but air supply to injection holes becomes insufficient
Solution Approach 1:
The air supply path is changed from radial (through bowl wall holes) to axial (through flared wall holes). This allows the cylindrical part to have a reduced diameter D3 that fits constrained spaces, while the flared extension provides sufficient axial air supply to the injection holes without requiring a larger base diameter.
3Quantity of substance
If conventional bowl designs are used in multi-head chambers, then integration is possible, but air supply to injection holes is insufficient for high permeability requirements
Solution Approach 1:
The bowl is divided into functional segments: the cylindrical wall for mounting and structural integrity, and the flared wall extension specifically designed for air introduction. This segmentation enables high permeability functionality without requiring complex overall structural modifications to the injection device.
Solution Approach 2:
The flared wall acts as an intermediary structure that bridges the cylindrical bowl and the injection holes. It provides a dedicated air introduction pathway that simplifies the overall design compared to attempting to supply air through the cylindrical wall in conventional configurations.
Data Source
Figure 1~2
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AI summary
The device has a bowl (30) axially spaced from a radial gimlet (42), and a support ring (50) arranged around the bowl. The bowl has a cylindrical wall (32) extended by a widened wall (31), where the wall is provided with an air insertion hole (34). The ring has an upstream cylindrical part (51) with an outer diameter (D3) and a downstream cylindrical part (52) with an external diameter (D4). The cylindrical part (52) is axially spaced from the part (51), where the part (51) is connected to the wall by engine support lugs (55).