Gas Turbine Combustor Flow Guide Member Vibration Attenuation
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Solution Overview
Problem
Gas turbines experience efficiency losses due to strong swirls generated in the nozzle end plate region, leading to pressure loss and potential damage from high-frequency pressure vibrations transmitted to the nozzle assembly.
Innovation Solution
A combustor design incorporating a flow guide member with a resonator function to guide air flow and attenuate vibrations, featuring a plurality of holes and a resonance space to prevent swirls and absorb vibrations, thereby enhancing combustion and overall efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If air flow direction is rapidly changed on the nozzle end plate, then combustion can be performed, but strong swirls are generated causing pressure loss and efficiency reduction
Solution Approach 1:
A flow guide member is introduced as an intermediary component between the air supply path and the nozzle end plate. This flow guide member has a curved surface that gradually changes the flow direction, acting as a mediator that transitions the air flow from the original direction to the combustion direction without causing strong swirls, thus reducing pressure loss while maintaining combustion performance
Solution Approach 2:
The flow guide member performs preliminary action by pre-adjusting the air flow direction before it reaches the nozzle end plate. The curved surface of the flow guide member gradually redirects the air flow in advance, preventing the sudden direction change that would otherwise generate harmful swirls and pressure loss
2Stress or pressure
If high-frequency pressure vibration is transmitted to the nozzle assembly, then combustion pressure is maintained, but damage to the nozzle assembly occurs
Solution Approach 1:
The flow guide member serves as a vibration-isolating intermediary between the combustion chamber and the nozzle assembly. It absorbs and dampens high-frequency pressure vibrations generated during combustion, preventing these vibrations from being transmitted to the nozzle assembly, thus protecting the nozzle from damage while maintaining combustion pressure
Solution Approach 2:
The flow guide member provides beforehand cushioning by being positioned to intercept and absorb vibration energy before it can reach the nozzle assembly. This protective cushioning effect prevents vibration-induced damage to the nozzle while allowing combustion pressure to be maintained
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 effectively guides air flow to prevent swirls and reduces vibration transmission, improving combustion efficiency and protecting the nozzle assembly from damage, resulting in enhanced performance and reliability of the gas turbine.
Implementation Method 1
a flow guide member configured to guide a flow of air to be drawn into the nozzles
Implementation Method 2
the flow guide member may be configured as a resonator configured to attenuate vibration
Data Source
AI summary
The combustor of a gas turbine may include: a burner, including a plurality of nozzles, to eject fuel and air; and a duct assembly, coupled to one side of the burner, to combust the fuel and the air therein and transfer combustion gas to a turbine, where the burner may include a flow guide member to guide a flow of air to be drawn into the nozzles, and a plurality of holes may be formed in the flow guide member.