Tangential Gas Introduction Pipe for Combustor Swirl Flow
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Solution Overview
Problem
Conventional combustors require complex structures for gas introduction, complicating the formation of gas introduction portions and affecting the generation of swirl flows in combustion chambers.
Innovation Solution
A combustor design featuring a cylindrical combustion pipe with a gas introduction pipe that protrudes tangentially into the combustion pipe, simplifying the structure and facilitating the formation of a swirl flow by introducing fuel and oxidized gases through a single insertion hole, with a cross-sectional area and flow velocity optimized for stable combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine slits are formed in the combustion pipe to introduce fuel gas and combustion air, then ideal swirl flow is generated and fuel gas burns easily, but the structure of the gas introduction portion becomes complex and forming becomes difficult
Solution Approach 1:
The gas introduction portion is divided into separate functional components: a gas introduction pipe for introducing fuel gas and a separate air introduction mechanism. This segmentation allows each component to have a simple structure while collectively achieving the desired swirl flow and combustion stability, avoiding the need for complex fine slits in the combustion pipe.
Solution Approach 2:
The gas introduction pipe is inserted into the combustion pipe, with the gas introduction portion nested within the combustion chamber structure. This nested arrangement allows the gas introduction system to be integrated into the existing combustion pipe geometry, simplifying the overall structure while maintaining effective gas introduction and swirl flow generation.
2Ease of operation
If fine slits are formed in the combustion pipe to introduce fuel gas and combustion air, then ideal swirl flow is generated and fuel gas burns easily, but the forming process becomes complicated
Solution Approach 1:
The complex slit-forming operation is extracted from the combustion pipe and relocated to the gas introduction pipe. The fine structures are formed in the gas introduction pipe instead of the combustion pipe, which simplifies the manufacturing of the combustion pipe while achieving the same swirl flow generation effect through the gas introduction mechanism.
3Ease of manufacture
If a simple gas introduction structure is used, then forming is facilitated, but swirl flow generation becomes difficult
Solution Approach 1:
The gas introduction pipe is designed with specific local geometric features at its end portion that protrudes into the combustion chamber. These localized structural characteristics create the necessary flow conditions for swirl generation, while the rest of the structure remains simple and easy to manufacture. The local quality of the gas introduction geometry enables swirl flow without requiring complex overall structure.
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 design enables a simple and stable generation of swirl flows, widening the combustible range of fuel gases relative to excess ratios of oxidized gases, ensuring easy and stable combustion.
Implementation Method 1
the gas introduction pipe protrudes toward an inside of the combustion pipe through the insertion hole in a tangential direction to an inner peripheral surface of the combustion pipe so that the gas outlet is accommodated in the combustion pipe... a swirl flow (tubular flow) of the fuel gas and the oxidized gas is generated in the combustion pipe
Implementation Method 2
The fuel gas in the mixed gas is ignited by the igniter, and burns to generate combustion gas
Data Source
AI summary
A combustor includes a combustion pipe, a gas introduction pipe, and an igniter. The gas introduction pipe is connected at one end of the gas introduction pipe to the combustion pipe, and the one end has a gas outlet through which ammonia and oxidized gas flow to the combustion pipe. The gas introduction pipe protrudes toward an inside of the combustion pipe through an insertion hole of the combustion pipe in a tangential direction to an inner peripheral surface of the combustion pipe so that the gas outlet is accommodated in the combustion pipe. The gas introduction pipe has a cross-sectional area that is defined so that mixed gas of the ammonia and the oxidized gas flows to the combustion pipe through the gas outlet at a flow velocity of 3 m/s to 25 m/s relative to a flow rate of the mixed gas.