Ammonia Engine Combustor Electrode Layout for Rapid Startup
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Solution Overview
Problem
Existing combustors struggle to discharge a large amount of combustion gas efficiently at an early stage after flame generation.
Innovation Solution
A combustor design with a cylindrical housing and an ignition plug that generates a tubular flow with a negative pressure region, where the positive and negative electrodes are positioned to create a spark for flame formation only in this region, enhancing early combustion gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the ignition plug generates a spark with electrodes positioned close to each other, then the flame is formed quickly and efficiently, but the flame may spread to other regions including the positive pressure region, reducing combustion efficiency
Solution Approach 1:
The ignition plug electrodes are positioned to create a localized flame only in the negative pressure region, ensuring that combustion occurs efficiently in the optimal zone while preventing flame spread to the positive pressure region. This localizes the combustion process to where it is most effective.
Solution Approach 2:
The tubular flow is generated in advance by the inlet before ignition occurs, creating the negative pressure region that guides the flame propagation direction. This preliminary flow generation ensures the flame will naturally progress through the combustor in the desired direction.
2Loss of time
If the combustor generates a large amount of combustion gas quickly, then the reforming catalyst warms up faster and the engine starts sooner, but this requires optimized ignition and flow conditions that may be difficult to achieve
Solution Approach 1:
The tubular flow generated by the inlet automatically creates the negative pressure region that directs flame propagation. The system uses its own flow dynamics to achieve optimal combustion conditions without requiring external control mechanisms or complex ignition systems.
Solution Approach 2:
The invention changes the spatial arrangement parameters of the electrodes and inlet to create specific flow patterns and pressure regions. By optimizing these geometric parameters, the system achieves rapid combustion gas generation through simplified means rather than complex control.
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 design allows for rapid generation of a large amount of combustion gas, which quickly warms up the reforming catalyst, enabling the ammonia engine to start sooner, thus reducing startup time.
Implementation Method 1
The inlet is configured such that the tubular flow generates a negative pressure region in part of the housing
Implementation Method 2
the tubular flow generates a negative pressure region in part of the housing
Implementation Method 3
an ignition unit configured to generate a spark between the positive electrode and the negative electrode
Implementation Method 4
fuel mixed with oxidizing gas and combustion gas generated by combustion of the fuel flow through the housing
Data Source
AI summary
A combustor (40) includes a housing (41) having an open first end and a closed second end (41b), an inlet that introduces fuel and oxidizing gas into the housing (41) such that a tubular flow (F1) is generated in the housing (41), an ignition plug (44) disposed at the second end (41b), and an ignition unit that generates a spark (P1) between a positive electrode (45) and a negative electrode (46). The positive electrode (45) and the negative electrode (46) are each located at a position where a distance (L1) between them is shorter than a distance (L2) between the positive electrode (45) and an inner circumferential surface (41d) of the housing (41) such that a flame (P2) generated between the positive electrode (45) and the negative electrode (46) by the spark (P1) is formed only in a negative pressure region (A1).