Burner Circumferential Wall Thickness for Combustion Efficiency
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Solution Overview
Problem
Existing burners for mobile, fuel-operated heating devices, such as vehicle heaters, suffer from inhomogeneous distribution of fuel and air, leading to inefficient combustion characterized by soot formation and increased NOx emissions due to radial air supply openings and insufficient swirl support, which affects combustion efficiency and thermal economy.
Innovation Solution
The burner design features a circumferential wall with increased thickness in regions surrounding air supply openings, creating longer air supply channels and allowing for varied angles of air supply openings, which enhances air penetration and swirl formation, improving combustion efficiency and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circumferential wall thickness is increased to provide swirl support and ensure proper air supply channel length, then combustion efficiency improves, but thermal economy deteriorates due to increased heat loss through the thicker wall
Solution Approach 1:
The circumferential wall is designed with non-uniform thickness, featuring localized thickening specifically in the region of air supply openings to provide adequate swirl support and channel length, while maintaining thinner wall sections in other areas to minimize heat loss and preserve thermal economy
Solution Approach 2:
The air supply opening channel is extended by utilizing the circumferential direction of the wall, creating a spiral or angled path that increases channel length and swirl effect without requiring a proportional increase in overall wall thickness
2Ease of manufacture
If air supply openings are arranged radially perpendicular to the circumferential wall, then manufacturing is simplified, but fuel and air distribution becomes inhomogeneous leading to incomplete combustion and increased emissions
Solution Approach 1:
The air supply openings are designed with asymmetric orientation, inclined at specific angles relative to the radial direction perpendicular to the circumferential wall, creating non-uniform flow patterns that enhance mixing and distribution of fuel and air for more complete combustion
Solution Approach 2:
The air supply openings are configured to generate dynamic swirl and rotational flow patterns within the combustion chamber, creating turbulent mixing that improves homogeneity of fuel-air distribution and reduces harmful emissions
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 achieves improved air distribution and combustion efficiency, reducing soot formation and NOx emissions while maintaining a thin wall for thermal economy, making it suitable for continuous combustion and strong partial load conditions.
Implementation Method 1
Metal fiber fleeces, for example, can be used as the evaporator itself. The evaporator soaks up liquid fuel, in particular by capillary action, and distributes liquid fuel.
Implementation Method 2
By means of the heat provided by a glow plug 11 or ignition element, liquid fuel is vaporized and ignited
Implementation Method 3
The burner has a circumferential wall with a plurality of air supply openings. The circumferential wall has an increased thickness at least in a first region surrounding one of the air supply openings compared to a second region located between two air supply openings.
Data Source
AI summary
A burner for a mobile fuel-operated heating device, in particular for a vehicle heating device, comprising: —an evaporator receiving body for receiving an evaporator assembly for distributing and evaporating liquid fuel and—at least one fuel supply line for supplying liquid fuel to the evaporator assembly, wherein the burner has a circumferential wall with a plurality of air supply openings, and the circumferential wall has an increased thickness at least in a first region which surrounds one of the air supply openings in comparison to the thickness in a second region which lies between two air supply openings. The invention additionally relates to a mobile heating device and to a method for producing the evaporator receiving assembly.