Axial Multi-Stage Combustor Injector Layout for Acoustic Stability
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Solution Overview
Problem
The complexity of axial multi-stage combustors leads to combustion instability, requiring extensive trial and error to find operating conditions, increasing development costs and time.
Innovation Solution
A design method for axial multi-stage combustors that involves defining combustion chambers, disposing primary and secondary injectors, setting an acoustic field, simulating pressure fluctuations, and determining the secondary injector's position based on pressure node points to stabilize combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial multi-stage combustor system is used to reduce pollutants and increase thermal efficiency, then environmental performance and thermal efficiency are improved, but combustion instability becomes more complicated
Solution Approach 1:
The patent applies preliminary action by performing acoustic field analysis and pressure fluctuation simulation during the design phase to predeterminedly identify optimal injector positions. This allows combustion stability to be ensured before actual operation, avoiding the need for extensive trial-and-error experiments while managing the complexity of multi-stage combustor systems.
2Reliability
If repeated designs and experiments are conducted to find optimal operating conditions, then combustion stability can be achieved, but development time and costs increase
Solution Approach 1:
The patent replaces physical trial-and-error experiments with computational acoustic field analysis and pressure fluctuation simulation. By using numerical methods to predict combustion behavior and identify optimal injector positions, the development process is accelerated significantly while maintaining reliability in achieving combustion stability.
Solution Approach 2:
The patent creates a virtual acoustic field model that copies and simulates the actual combustor's acoustic characteristics. This digital twin approach allows researchers to study pressure fluctuation patterns and determine optimal injector positions without building and testing multiple physical prototypes, thereby reducing development time and costs.
3Manufacturing precision
If multiple variables are considered in combustor design, then comprehensive optimization is achieved, but the number of required experiments increases
Solution Approach 1:
The patent systematically analyzes and adjusts key parameters such as injector position, nozzle orientation, and fuel-air mixture composition within the acoustic field model. By changing these parameters in simulation and observing their effects on pressure fluctuation, the method achieves comprehensive design optimization while avoiding the exponential increase in experiments that would result from considering all possible variable combinations.
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
Reduces development costs by minimizing repetitive designs and experiments, while effectively suppressing combustion instability and securing a wide operating range.
Implementation Method 1
setting an acoustic field of the combustor; simulating a pressure fluctuation distribution within the acoustic field
Data Source
AI summary
Provided is a method of designing a combustor including a first combustion chamber and a second combustion chamber connected in an axial direction includes defining zones of the first combustion chamber and the second combustion chamber, disposing a primary injector supplying a fuel-air mixture to the first combustion chamber, and disposing a secondary injector supplying an additional fuel-air mixture to the second combustion chamber, wherein the disposing of the secondary injector includes setting an acoustic field of the combustor, simulating a pressure fluctuation distribution within the acoustic field, and determining an arrangement position of the secondary injector based on the pressure fluctuation distribution.