Pre-Chamber Hydrogen Injection for Homogeneous Piston Engine Combustion
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Solution Overview
Problem
Existing piston engines, particularly those using hydrogen as fuel, suffer from low efficiency due to inhomogeneous fuel distribution in the combustion chamber, leading to unwanted pre-ignition and inefficient combustion, which is exacerbated by direct injection methods that cause fuel to vaporize prematurely and create rich and lean regions.
Innovation Solution
The method introduces fuel into a pre-chamber at high pressure, allowing it to spread via flow paths to multiple positions in the combustion chamber, mixing with oxygen-containing gas to form a homogeneous mixture, and igniting the mixture at multiple points to achieve rapid and efficient combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuel is injected directly into the combustion chamber, then injection simplicity is improved, but fuel distribution homogeneity deteriorates
Solution Approach 1:
The combustion chamber is segmented into a pre-chamber and a main combustion chamber. Fuel is injected into the pre-chamber first, then distributed to multiple positions in the main combustion chamber through flow paths, achieving homogeneous fuel distribution without requiring a complex multi-point direct injection system.
Solution Approach 2:
The pre-chamber acts as an intermediary between the fuel injector and the main combustion chamber. It receives fuel from the injector and distributes it to multiple positions in the main combustion chamber, ensuring homogeneous mixing while simplifying the injection system architecture.
2Speed
If cryogenic hydrogen is injected directly into the combustion chamber, then injection speed is improved, but fuel vaporization control deteriorates
Solution Approach 1:
Hydrogen is injected into the pre-chamber before entering the main combustion chamber. This preliminary injection allows the cryogenic hydrogen to begin vaporizing and mixing in the pre-chamber environment, improving temperature control and preventing premature vaporization issues that would occur with direct injection into the hot combustion chamber.
3Power
If direct injection into combustion chamber is used, then power density is improved, but pre-ignition control deteriorates
Solution Approach 1:
The pre-chamber provides a localized environment with different temperature and pressure characteristics compared to the main combustion chamber. Fuel injection and initial mixing occur in this controlled local environment, preventing premature ignition while maintaining high power density through subsequent combustion in the main chamber.
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 approach results in a highly efficient combustion process with a very high power density, preventing unwanted pre-ignition and enabling complete combustion by ensuring a uniform fuel distribution, even with cryogenic hydrogen injection.
Implementation Method 1
fuel, in particular hydrogen, is introduced into a pre-chamber by means of an injector at high pressure
Implementation Method 2
fuel then spreads from the pre-chamber into the combustion chamber via flow paths which connect the pre-chamber with several positions in the combustion chamber
Implementation Method 3
fuel mixes with an oxygen-containing gas, in particular air, in the combustion chamber and the ignitable mixture is formed
Implementation Method 4
the ignitable mixture is ignited in the combustion chamber
Data Source
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AI summary
The invention relates to a method for operating a piston engine, in particular a reciprocating piston engine, wherein an ignitable mixture is ignited in a combustion chamber (19) adjacent to a piston (18), which piston (18) is connected to a shaft (20) rotating about an engine axis. To achieve particularly high efficiency, the invention provides that fuel, in particular hydrogen, is introduced into a pre-chamber (1) by means of an injector (13), and that this fuel then spreads from the pre-chamber (1) into the combustion chamber (19) via flow paths (2) connecting the pre-chamber (1) to several positions (5a, 5b) in the combustion chamber (19), after which the fuel mixes with an oxygen-containing gas, in particular air, in the combustion chamber (19) and the ignitable mixture is formed, after which the mixture is ignited in the combustion chamber.The invention further relates to a fuel, in particular hydrogen, which is introduced into a pre-chamber (1) by means of an injector (13) and which subsequently spreads from the pre-chamber (1) into the combustion chamber (19) via flow paths (2) which connect the pre-chamber (1) with several positions (5a, 5b) in the combustion chamber (19), after which the fuel mixes with an oxygen-containing gas, in particular air, in the combustion chamber (19) and the ignitable mixture is formed, after which the mixture is ignited in the combustion chamber.