Turbojet Flame Holder With Segmented Mast Fixing
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Solution Overview
Problem
The existing flame holder devices for turbofan engines have complex and expensive geometries, requiring costly materials and intricate machining, which complicates manufacturing and positioning, especially due to the need for high-temperature resistance near the primary flow.
Innovation Solution
A simplified flame holder device with a channel-shaped arm and thermal protection screen, featuring a fixing plate with an integrally formed mast and a removably mounted second mast, allowing for adjustable positioning and reduced manufacturing costs, using titanium for temperature resistance only in the secondary flow area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the adaptation piece is designed to perform multiple functions (positioning, fixing, static pressure tapping, guiding), then the device achieves high functionality, but the geometry becomes complex and manufacturing cost increases
Solution Approach 1:
The invention divides the complex adaptation piece into separate functional components: a positioning device with masts for positioning and fixing the arm, a separate static pressure tapping device, and a separate guiding device. This segmentation allows each component to have a simplified geometry optimized for its specific function, while collectively achieving the same multifunctionality as the integrated complex piece.
Solution Approach 2:
The invention extracts specific functions from the complex adaptation piece and implements them through separate, simpler devices. The positioning and fixing function is extracted and implemented by the positioning device with masts, the static pressure tapping function is extracted and implemented by a dedicated tapping device, and the guiding function is extracted and implemented by a separate guiding device.
2Temperature
If the adaptation piece is made of high-temperature resistant metallic material, then the device can withstand heat from the primary flow, but the manufacturing cost increases significantly
Solution Approach 1:
The invention applies different material qualities to different parts of the device based on their specific thermal requirements. The arm, which is directly exposed to the primary flow and requires high-temperature resistance, is made of high-temperature resistant material. The positioning device, static pressure tapping device, and other components that are not directly exposed to high temperatures are made of less expensive materials, thereby reducing overall manufacturing cost while maintaining necessary heat resistance where required.
3Manufacturing precision
If the arm positioning requires precise machining and pairing adjustments, then the positioning precision is high, but the manufacturing time and complexity increase
Solution Approach 1:
The invention incorporates preliminary positioning features directly into the design of the arm and positioning device. The arm includes specific positioning elements that mate with corresponding features on the positioning device masts, allowing for straightforward assembly without requiring complex post-manufacturing adjustments or pairings. This preliminary action ensures precise positioning is achieved through the design itself rather than through time-consuming adjustment processes.
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 simplifies geometry, reduces manufacturing costs, and eliminates the need for complex machining, while using titanium for temperature resistance only where necessary, making the device more affordable and efficient.
Implementation Method 1
a thermal protection screen 130 fixed in the cavity 121 of the arm 120
Implementation Method 2
a hollow part for taking in static pressure fixed to the fixing plate 110
Implementation Method 3
a tubular fuel injector 160 passing through the fixing plate 110
Data Source
Figure 1~3
Figure 4
Figure 5~7
AI summary
The invention relates to a flame-holder device (100) for the reheat channel of a turbojet comprising a chute-shaped arm (120) defining a cavity (121) and a heat shield (130) secured in the cavity of the arm. The flame-holder device (100) further comprises an attachment plate (110) comprising a first mast (114) integrally formed with the attachment plate (110) and a second mast (115) removably mounted on said plate, the arm (120) being attached to the first and second masts (114, 115) by attachment members.