Peripheral Staging Burner Asymmetry for Vibration Suppression
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Solution Overview
Problem
Existing burner arrangements experience high-frequency vibrations (HFD) that limit their operating range and can lead to machine shutdown or damage, particularly due to nonuniform air distribution causing variations in flame temperature.
Innovation Solution
The burner arrangement features mixing channels grouped into fuel stages with a common fuel supply, arranged in a peripheral configuration instead of radial, with a centrally located pilot burner and asymmetrical distribution of mixing channels across concentric circles to stabilize combustion and suppress high-frequency dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If radial staging with uniform fuel distribution is used, then manufacturing simplicity is improved, but high-frequency vibrations occur that limit operating range
Solution Approach 1:
The patent applies asymmetry by transitioning from uniform radial staging to irregular peripheral staging. The mixing channels are distributed non-uniformly in the peripheral direction, creating an asymmetric fuel distribution pattern that disrupts the regularity causing HFD. This asymmetric arrangement suppresses high-frequency vibrations while maintaining manufacturing feasibility through the modular nozzle carrier design.
Solution Approach 2:
The patent changes the staging dimension from radial (uniform distribution along radius) to peripheral (irregular distribution around the circumference). This dimensional shift in the fuel distribution pattern transforms the combustion dynamics, eliminating the circumferential mode components that generate HFD while preserving the overall structural simplicity.
2Ease of manufacture
If uniform fuel distribution is used, then manufacturing is simplified, but flame temperature varies causing HFD dynamics
Solution Approach 1:
The patent introduces asymmetric fuel distribution through irregular peripheral staging of mixing channels. By varying the angular positions and densities of channels around the periphery, the design creates deliberate asymmetry in flame temperature distribution, which prevents the formation of coherent HFD patterns while maintaining acceptable manufacturing complexity.
3Device complexity
If regular staging pattern (AABB) is used, then structural simplicity is improved, but high-frequency vibrations are not suppressed
Solution Approach 1:
The patent eliminates regular AABB patterns by implementing irregular peripheral staging where mixing channels are positioned asymmetrically around the periphery. This breaks the periodicity and symmetry that would allow HFD to develop, while the overall structure remains sufficiently simple through consistent geometric relationships and modular construction.
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 configuration enhances operational stability, reduces flame loss during loading, and limits high-frequency vibrations by allowing moderate asymmetry in fuel distribution, ensuring uniform loading of downstream components and maximum combustion stability.
Implementation Method 1
mixing channels fuel and discharge air from the compressor are mixed during the operation of the burner arrangement
Implementation Method 2
a centrally arranged pilot burner in order to stabilize the combustion of the fuel/air mixture supplied by the mixing channels
Implementation Method 3
This enables the flame temperature to be varied slightly over the circumference, effectively suppressing the formation of the HFD dynamics which typically arise with a circumferential mode component
Data Source
AI summary
A burner arrangement has a plurality of mixing channels which extend parallel to the main axis of the burner arrangement and are arranged in at least two concentric circles, in which mixing channels fuel and discharge air from the compressor are mixed during the operation of the burner arrangement. The mixing channels are grouped together into fuel stages so as to produce an irregular staging in the peripheral direction of the burner arrangement.