Multi-stage Flame Acceleration Device for Gas Engine Combustion
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Solution Overview
Problem
Gas-fuel engines using natural gas and ammonia face issues with low flame propagation velocity and ignition stability, leading to inferior power performance and economical efficiency compared to traditional engines.
Innovation Solution
A multi-stage flame acceleration device featuring annular obstacles within a flame acceleration nozzle, which accelerates the combustion process by ejecting high-velocity jets of combustion intermediates, enhancing turbulence and flame intensity, and includes a cooling channel to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If gas fuel (natural gas or ammonia) is used in the engine, then the emission is reduced and cost is lowered, but the flame propagation velocity decreases and ignition stability deteriorates
Solution Approach 1:
The combustion chamber is divided into multiple zones with obstacles (annular plates with holes) that segment the flame propagation path. This segmentation creates multiple ignition points and turbulent flow paths, accelerating flame propagation while maintaining the benefits of gas fuel combustion
Solution Approach 2:
A flame acceleration device is introduced as an intermediary component between the fuel injection system and the combustion chamber. This device pre-accelerates the flame front using obstacles and turbulence generation before the flame enters the main combustion chamber, solving the low flame speed issue of gas fuels
2Object-generated harmful factors
If gas fuel (natural gas or ammonia) is used in the engine, then the emission is reduced and cost is lowered, but the ignition stability deteriorates
Solution Approach 1:
The flame acceleration device performs preliminary action by pre-igniting and pre-accelerating the flame front in a controlled manner before it enters the main combustion chamber. This preliminary flame acceleration ensures stable ignition and reliable combustion of gas fuels
Solution Approach 2:
The obstacles in the flame acceleration device generate mechanical turbulence and vibration in the flame front, enhancing mixing and combustion stability. This turbulent motion ensures consistent ignition performance and reduces combustion instability
3Speed
If obstacles are added to accelerate flame, then the flame propagation velocity increases, but the device complexity increases
Solution Approach 1:
The flame acceleration device with its obstacles is nested within the existing combustion chamber structure. The annular plates with holes are positioned concentrically, creating a compact nested arrangement that accelerates flame without requiring a completely redesigned combustion chamber
Solution Approach 2:
The obstacles use porous-like structures (annular plates with holes) that allow flame passage while generating turbulence. This porous arrangement achieves flame acceleration with minimal material and simple geometry, avoiding complex solid barriers
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 device achieves ultra-lean and high-efficiency combustion by reliably igniting and accelerating the flame, improving ignition stability and combustion rate, while allowing for the use of single or dual fuels to optimize performance.
Implementation Method 1
the establishment of obstacles in a pipeline can realize flame acceleration to a great extent, and promote the generation of turbulence in gas flow formed by combustion
Implementation Method 2
Gas-fuel engines that combusts the natural gas and the ammonia gas
Implementation Method 3
the flowing of the gas flow caused by thermal expansion of combustion products will increase the surface area of the flame
Data Source
AI summary
A multi-stage flame acceleration device and method for a gas-fuel engine are provided. The device includes a pressing piece, an upper chamber, a spark plug, a fuel ejector, a cooling device, and a flame acceleration nozzle. The spark plug and the fuel ejector are mounted in the upper chamber. The pressing piece is sleeved on an upper part of the upper chamber, and the device is wholly and fixedly connected to a cylinder head through a step groove of the upper chamber. A nozzle sealing ring, the flame acceleration nozzle, and a cylinder head sealing ring are mounted at a bottom of the upper chamber from top to bottom in sequence. Annular obstacles formed by annular plates are arranged in a chamber of the flame acceleration nozzle. In the method, a fuel is ejected in the chamber of the flame acceleration nozzle to obtain a homogeneous gas mixture.