Combustion Arrangement Damping Facility
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Solution Overview
Problem
Gas turbines experience performance reduction due to pressure oscillations within the combustion chamber, which are not effectively damped by existing methods, leading to inefficient operation and potential component damage.
Innovation Solution
A combustion arrangement featuring a casing with a partitioning wall and a valve that adjusts fluid flow to damp oscillations by branching off a portion of the oxidant, allowing fluid communication between two volumes to control oscillation amplitudes across different operational loads, and a controller to optimize valve positioning based on operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damping device is arranged within the combustion chamber or outside at pressure oscillation anti-nodes, then the amplitude of pressure oscillations is damped, but the full load characteristics are altered leading to increased combustion dynamics and unintentional oscillation resonance
Solution Approach 1:
The inner casing volume is segmented into a first volume portion and a second volume portion using a partitioning wall with apertures. This segmentation allows the damping function to be distributed across different spatial zones, enabling effective oscillation damping while preserving stable combustion characteristics across the entire combustion chamber volume.
Solution Approach 2:
A valve is introduced as an intermediary component to control fluid flow between the first and second volume portions. By regulating the flow through this intermediate element, the system can damp pressure oscillations without directly interfering with the combustion process, thus avoiding unwanted resonance while maintaining combustion stability.
2Object-affected harmful factors
If the geometry of the combustion chamber is modified to damp pressure oscillations, then oscillation amplitude is reduced, but the design complexity and operational flexibility are reduced
Solution Approach 1:
Instead of modifying the fixed geometry of the combustion chamber, the invention employs a dynamic valve that can adjust fluid flow between volume portions in response to operating conditions. This dynamic control mechanism provides adaptability across different operational loads while effectively damping pressure oscillations, preserving operational flexibility that rigid geometric modifications would eliminate.
3Object-affected harmful factors
If a high Mach number gas inlet flow is used to decouple the combustion chamber from outer flow pressure oscillations, then external oscillations are reduced, but internal combustion dynamics and pressure oscillations within the chamber increase
Solution Approach 1:
The partitioning wall with apertures and the valve act as intermediary elements that mediate between the first and second volume portions of the inner casing. This intermediary structure provides a controlled pathway for fluid exchange, damping internal pressure oscillations generated by high Mach number flow without requiring direct geometric modifications to the combustion chamber that would compromise combustion dynamics.
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
Effectively damps oscillations across various operational conditions, improving the efficiency and extending the lifespan of combustion arrangement components by actively controlling fluid flow and oscillation frequencies.
Implementation Method 1
the partitioning wall has at least one aperture to allow fluid communication between the first volume portion and the second volume portion for damping an oscillation of the arrangement
Implementation Method 2
a valve arranged at the casing to allow an outgoing fluid flow from the inner casing volume outside the combustion chamber to flow outside the casing depending on a valve operating position
Data Source
Figure 1
Figure 2
AI summary
It is described a combustion arrangement (100), comprising: a casing (101); a combustion chamber (103) arranged within the casing (101), wherein an inner casing volume (107, 109) is defined to be a volume inside the casing but outside the combustion chamber; a partitioning wall (105) partitioning the inner casing volume into a first volume portion (107) and a second volume portion (109), the partitioning wall having at least one aperture (111, 113) to allow fluid communication (145) between the first volume portion (107) and the second volume portion (109); and a valve (115) arranged at the casing to allow an outgoing fluid flow (116) from the inner casing volume (107, 109) to an outside (119) of the casing (101) depending on a valve operating position; wherein the combustion chamber has a combustion entry port (121) for supplying an oxidant into the combustion chamber (103), wherein the combustion entry port (121) is in fluid communication with the first volume portion (107), wherein the arrangement (100, 125) is adapted to adjust the valve operating position for damping an oscillation of the arrangement.