Hydrogen Intake Runner Layout to Prevent Preignition and Backfire
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Solution Overview
Problem
Gaseous hydrogen fuel in reciprocating piston engines faces challenges such as preignition, backfiring, and undesired combustion due to its low flammability limit and fast flame speed, particularly in applications with high load demands or wide load ranges.
Innovation Solution
The system optimizes the injection of gaseous hydrogen fuel by positioning the injection location and angle relative to the intake port and runner outlet, balancing residual fuel amounts and distribution patterns to minimize preignition and backfire, using an intake runner with a conduit and valve mount configuration that includes an angled hydrogen fuel passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gaseous hydrogen fuel is injected into the cylinder for high load demands, then power output is improved, but preignition and undesired combustion occur due to low flammability limit and fast flame speed
Solution Approach 1:
The fuel injection system introduces gaseous hydrogen fuel into the intake port or intake passage before the intake valve closes, allowing the fuel to mix with the incoming air charge in advance. This preliminary mixing ensures proper fuel distribution and concentration before combustion, preventing preignition while maintaining power output at high load demands
Solution Approach 2:
The system optimizes fuel distribution by creating localized fuel-rich zones in specific regions of the intake port or passage where proper mixing occurs, rather than uniform distribution. This localized approach ensures adequate fuel concentration for power generation while preventing premature combustion in other areas
2Adaptability or versatility
If gaseous hydrogen fuel is injected to meet wide load range demands, then adaptability is improved, but backfiring occurs due to improper fuel distribution
Solution Approach 1:
The fuel injection system dynamically adjusts injection timing, duration, and quantity based on real-time engine operating conditions and load demands. This dynamic control ensures optimal fuel distribution across the wide load range, preventing backfiring by maintaining proper air-fuel mixture ratios under varying operating conditions
Solution Approach 2:
The system incorporates feedback mechanisms that monitor engine parameters such as load, speed, and combustion characteristics to continuously optimize fuel injection strategies. This feedback control prevents backfiring by adjusting fuel distribution in response to actual combustion conditions while maintaining adaptability across different load ranges
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 effectively reduces the likelihood of preignition and backfire by ensuring proper mixing and distribution of hydrogen fuel, allowing for efficient operation across varying load conditions.
Implementation Method 1
a fuel passage extending between the valve mount and the engine end
Implementation Method 2
balancing residual fuel amounts and distribution patterns of a gaseous hydrogen fuel
Implementation Method 3
combusting the hydrogen fuel and the pressurized intake air in the cylinder
Data Source
AI summary
A gaseous fuel engine system includes a hydrogen fuel supply, an engine housing having an intake port extending to a cylinder, and an intake runner. The intake runner includes a valve mount attached to a conduit and having a valve mounting face, and a gaseous fuel admission valve is mounted upon the valve mounting face. A hydrogen fuel passage extends from the valve mount through the conduit and is oriented angularly to at least one of a clamping face of the intake runner or the valve mounting face. Related apparatus and methodology is also disclosed.