Combustor Peg Support Curved Guide Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas turbines experience efficiency losses due to strong swirls generated during air flow direction changes in the combustor, leading to pressure loss and instability of fuel pegs due to vibration.
Innovation Solution
A combustor design with annularly shaped peg supports and curved guide surfaces that stabilize fuel pegs and guide air flow, minimizing swirl generation and ensuring uniform air distribution to nozzles, comprising multiple peg supports with varying curvature radii and inclined axes to support fuel pegs and enhance fuel-air mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the air flow direction is rapidly changed on the nozzle end plate to supply air to nozzles, then the air can be delivered to the combustion zone, but strong swirls are generated causing pressure loss and efficiency reduction
Solution Approach 1:
The patent employs curved guide surfaces with specific curvature radii on the peg support structure to gradually redirect air flow toward the nozzles. This curved geometry replaces sharp directional changes with smooth transitions, reducing swirl generation while maintaining effective air delivery to the combustion zone.
Solution Approach 2:
The peg support structure with guide surfaces performs preliminary flow conditioning before air enters the nozzles. By pre-guiding the air flow in a controlled manner, the system prevents the formation of strong swirls that would otherwise occur during rapid direction changes, thereby reducing pressure loss.
2Productivity
If fuel pegs protrude into the flow passage to eject fuel toward air for pre-mixing, then fuel-air mixing is enhanced, but the fuel pegs become vulnerable to vibration and instability
Solution Approach 1:
The peg support structure serves as an intermediary element that holds the fuel pegs in a stable position while allowing them to protrude into the flow passage. This mediator structure provides mechanical support and vibration damping, enabling the fuel pegs to maintain their mixing function without suffering from instability.
Solution Approach 2:
The fuel delivery system is segmented into multiple components: the peg support structure and the fuel pegs themselves. This segmentation allows the support structure to handle mechanical stability and vibration resistance, while the fuel pegs focus on fuel ejection and mixing, optimizing both reliability and productivity.
Data Source
AI summary
A combustor and a gas turbine capable of stably supporting a fuel peg and guiding the flow of air are provided. The combustor may include: a plurality of nozzles configured to eject fuel and air; a flow passage configured to guide a flow of air to be drawn into the nozzles; a plurality of fuel pegs configured to protrude into the flow passage, each of the plurality of fuel pegs including an injection hole through which fuel is discharged; and a peg support configured to be coupled to the fuel pegs to support the fuel pegs.