Evaporation Burner Airflow Segmentation for Ignition
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Solution Overview
Problem
Conventional evaporation type burners face issues with ignitability due to excess fuel concentration near the glow plug, difficulty in fuel permeation into the wick, and incomplete combustion caused by inadequate air supply, leading to reduced wick lifetime and inefficient combustion.
Innovation Solution
The design includes a combustion chamber with a capillary or porous impregnation member, a promotion member with through-holes, and strategically positioned air supply openings to ensure proper air distribution and heat transfer, enhancing ignitability and fuel permeation while preventing thermal deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a windbreak member is prepared on the air supply opening side of the glow plug to prevent air from directly blowing on the glow plug, then the glow plug is protected from cooling, but the fuel concentration near the glow plug becomes excessive and ignitability decreases
Solution Approach 1:
The air supply opening is divided into two separate openings: a first air supply opening that supplies air to the ignition space near the glow plug, and a second air supply opening that supplies air to the combustion space downstream. This segmentation allows independent control of air supply to different zones, preventing excessive fuel concentration near the glow plug while maintaining adequate temperature protection.
Solution Approach 2:
A promotion member with through-holes is introduced as an intermediary component between the impregnation member and the combustion space. This promotion member facilitates controlled air passage and fuel vapor distribution, ensuring proper mixing and preventing fuel accumulation near the ignition device while maintaining efficient combustion downstream.
2Temperature
If fuel is supplied to a curved part of the element for evaporation, then heat transfer from the ignition mechanism is improved, but fuel permeation into the element becomes difficult
Solution Approach 1:
The impregnation member is designed with spatially varying properties: the upstream end (near fuel supply) has a structure optimized for fuel permeation, while the downstream end (near combustion) has a structure optimized for heat transfer and vapor generation. This local differentiation allows each region to perform its specific function effectively without compromising the other.
3Device complexity
If the width of the slot is constant over its entire length, then the structure is simple, but air quantity becomes insufficient on the downstream side causing incomplete combustion
Solution Approach 1:
The air supply system is segmented into multiple openings positioned at different locations: the first air supply opening near the ignition device and the second air supply opening in the combustion space. This segmentation ensures adequate air distribution throughout the combustion chamber, preventing incomplete combustion on the downstream side while maintaining structural simplicity.
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 improves ignitability, prolongs wick lifetime, and reduces incomplete combustion by ensuring a suitable air supply and efficient heat transfer, resulting in stable and efficient combustion.
Implementation Method 1
an impregnation member (8) having a capillary structure and/or porous structure
Implementation Method 2
vapor of the fuel generated from the wick is heated by a glow plug disposed in the vicinity of the wick to be ignited and burned
Implementation Method 3
an impregnation member (8) having a capillary structure and/or porous structure
Implementation Method 4
vapor of the fuel generated from the wick is heated by a glow plug disposed in the vicinity of the wick to be ignited and burned
Implementation Method 5
an air supply opening for introducing air for burning fuel into a combustion chamber
Data Source
AI summary
A promotion member is disposed a predetermined distance apart from an impregnation member disposed at an upstream side end of a combustion chamber, and an ignition device and a first air supply opening are prepared on an upstream side from the promotion member in an ignition space, and a second air supply opening is prepared on a downstream side from the promotion member in the ignition space. Fuel is supplied to a smooth surface of the impregnation member, and a concave part or cutout is formed in the impregnation member to house at least a part of the ignition device. A flow rate of air supplied to the combustion space through the second air supply opening becomes larger toward the downstream side. Thereby, ignitability in an evaporation type burner is improved and incomplete combustion of fuel on the downstream side of the combustion chamber is reduced.