Concentric Combustion Apparatus Flame Stability
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Solution Overview
Problem
Existing combustion apparatuses face challenges in achieving stable flame mixing and efficient fluid flow, leading to reduced burner loads and increased flashback risks due to limitations in fluid mixing and velocity gradients.
Innovation Solution
The design incorporates a center member with a hemispherical tip and concentric outer members to create channels that utilize the Coanda effect, enhance turbulent flow, and adjust channel widths to optimize fluid mixing and flame stability, while incorporating features like swirling vanes and spark plugs to improve combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional combustion apparatuses are used, then simple structure is maintained, but flame stability and mixing efficiency are reduced
Solution Approach 1:
The combustion apparatus employs nested concentric members (center member, first outer member, second outer member) with channels defined between them. Fluid flows through multiple concentric channels, creating staged mixing zones that enhance flame stability while maintaining a compact nested structure.
Solution Approach 2:
The center member features a hemispherical tip that utilizes the Coanda effect to attach and guide fluid flow along curved surfaces. This curvature enhances mixing efficiency and flame stability by creating controlled flow attachment and separation patterns.
2Productivity
If fluid flow rate is increased, then mixing efficiency is improved, but flashback risk increases
Solution Approach 1:
The apparatus segments the fluid flow into multiple channels with different flow rates and mixing stages. The concentric channels create progressive mixing zones that control velocity gradients and reduce flashback risk while maintaining high overall mixing efficiency.
Solution Approach 2:
Different regions of the apparatus provide different flow conditions - the inner channels create high velocity gradients for mixing, while outer channels provide more stable flow regions. This local variation in flow quality optimizes both mixing efficiency and flashback prevention.
3Speed
If channel width is decreased, then velocity gradient is maximized, but fluid flow resistance increases
Solution Approach 1:
The apparatus transitions from two-dimensional flow constraints to three-dimensional concentric channel geometry. Multiple radial and axial flow paths are created, allowing velocity gradients to be maximized in specific zones while maintaining overall flow throughput through additional dimensional pathways.
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 configuration increases flame stability, burner loads, and mixing efficiency, reduces flashback by maximizing velocity gradients and adjusting parameters like temperature and fluid flow rates, thereby enhancing overall combustion performance.
Implementation Method 1
The disclosed combustion apparatuses and methods can - in part by utilizing the Coanda effect - increase flame stability
Data Source
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Figure 3A
AI summary
Combustion apparatuses (e.g., burners) and methods, such as those configured to encourage mixing of fluid and flame stability, among other things.