Burner Flow Guidance Element for Uniform Fuel-Air Mixture

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Solution Overview

Problem

Existing burners face challenges in achieving even combustion due to uneven fuel-air mixture distribution, which affects the efficiency and stability of the combustion process.

Innovation Solution

A burner design featuring a sleeve-shaped flow guidance element with a progressively smaller annular gap between the combustion surface and the flow guide element, ensuring a more even supply of the fuel-air mixture as it progresses towards the combustion surface, with a conical flow guide element and spacers for precise alignment and minimal heat transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the annular gap between the flow guide element and combustion surface has constant cross-section, then the structure is simple, but the fuel-air mixture distribution becomes uneven towards the feed direction

Engineering Contradiction:

Improvestructural simplicityVSAvoidfuel-air mixture distribution uniformity

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The annular gap is designed with varying cross-sectional area along its length, creating different local flow conditions. The gap width changes from the combustion surface towards the feed to compensate for volume flow reduction, ensuring uniform mixture distribution throughout the burner body.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The cross-sectional area of the annular gap is varied as a design parameter along the flow direction. By adjusting the gap width at different positions, the flow velocity and pressure distribution are optimized to maintain even fuel-air mixture supply despite the decreasing volume flow towards the feed.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the annular gap cross-sectional area increases towards the feed, then the fuel-air mixture distribution improves, but the device complexity increases

Engineering Contradiction:

Improvefuel-air mixture distribution uniformityVSAvoidflow guidance structure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The flow guidance element is divided into multiple sections along its length, with each section having a specific gap width designed to compensate for local flow conditions. This segmentation allows precise control of the annular gap dimensions without requiring complex overall结构设计.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The flow guidance element features a conical or tapered geometry with curved surfaces, allowing the annular gap to gradually change cross-section. This curved design achieves the required variable gap width while maintaining manufacturing feasibility and structural integrity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Stability of the object's composition

If the flow guidance element extends deeply into the burner body, then the mixture distribution control improves, but the heat transfer to the element increases

Engineering Contradiction:

Improvemixture distribution controlVSAvoidheat transfer to flow guide element

Core Design Contradiction:

Stability of the object's compositionVSTemperature

Solution Approach 1:

The annular gap acts as an intermediary cooling channel between the combustion surface and the flow guidance element. The fuel-air mixture flowing through this gap provides convective cooling to the element, particularly at positions where the gap width is optimized, reducing heat accumulation without compromising flow distribution control.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 ensures a uniform fuel-air mixture supply, leading to improved combustion behavior and efficiency by adjusting the flow cross-sectional area in the direction of the feed, resulting in a more stable and even combustion process.

Implementation Method 1

the space between the flow-guiding element and the combustion surface becomes smaller and smaller in the direction of the gas supply, which takes into account the knowledge that as the run length progresses in the direction of the feed, more and more of the mixture has already passed through the combustion surface, and consequently an ever-decreasing volume flow flows in the direction of the feed

Methodology Applied

Scientific EffectVolume flow equalization:

Implementation Method 2

with a conical flow guide element and spacers for precise alignment and minimal heat transfer

Methodology Applied

Scientific EffectConical flow guidance:

Implementation Method 3

spacers for precise alignment and minimal heat transfer

Methodology Applied

Scientific EffectThermal isolation: Thermal Insulation

Implementation Method 4

combustion surface, with a sleeve-shaped flow guidance element for the fuel-air mixture being arranged in the burner body

Methodology Applied

Scientific EffectCombustion: Combustion

Data Source

PatentEP2048440B1Burner

Publication Date: 2013.10.02 VIESSMANN GRP GMBH & CO KG

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AI summary

Burner comprises a sleeve-like outer chamber (8) which decreases in the region of the burner surface (5) in relation to its cross-sectional surface in the direction of the feed (3). Preferred Features: A flow guiding element (6) has a conical shape in the region of the burner surface and is made from a sheet metal material. The end of the flow guiding element on the feed side has an outer diameter which corresponds to the inner diameter of the burner body (1) on the feed side. A spacer element (9) lies on an inner side of the burner body.