Dual Scraper Ring Engine Design for Condensation Fluid Removal
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Solution Overview
Problem
Internal combustion engines using alternative fuels like natural gas, LPG, bioethanol, and hydrogen face increased wear and operational issues due to residual water accumulation in the combustion chamber, which can mix with lubricating oil and cause damage.
Innovation Solution
The implementation of a dual scraper ring system, where a condensation fluid scraper ring removes gaseous water vapor condensate from the cylinder wall without mixing it with lubricating oil, utilizing separate drain channels and a fluid-oil separator to separate and manage the fluids effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single oil scraper ring is used to remove lubricating oil from the cylinder wall, then oil removal is achieved, but condensation fluid accumulates and mixes with the oil causing engine wear and damage
Solution Approach 1:
The single oil scraper ring is divided into two separate scraper rings: a first scraper ring for removing lubricating oil and a second scraper ring for removing condensation fluid. This segmentation allows each ring to perform its specific function independently, preventing mixing of oil and water and eliminating the harmful effects of water accumulation in the lubrication system.
2Adaptability or versatility
If alternative fuels (natural gas, LPG, bioethanol, hydrogen) are used to reduce petroleum dependency, then environmental performance improves, but water forms a large portion of combustion products leading to increased engine wear
Solution Approach 1:
The second scraper ring is specifically designed to extract and remove condensation fluid from the cylinder wall before it can mix with the lubricating oil. By actively removing the harmful water condensate at its source, the system maintains compatibility with alternative fuels while preventing the associated water-related wear problems.
3Reliability
If water vapor condensates on the cold cylinder wall during engine operation, then condensation fluid is formed, but this fluid accumulates and interferes with engine operation potentially causing damage
Solution Approach 1:
The second scraper ring performs preliminary removal of condensation fluid from the cylinder wall before the water can accumulate to harmful levels or mix with the lubricating oil. This proactive removal mechanism prevents interference with engine operation and maintains reliable performance.
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 solution prevents water accumulation and mixing with lubricating oil, reducing engine wear and maintaining optimal operation by ensuring the separation and proper handling of condensation fluid and oil, thereby extending engine life and performance.
Implementation Method 1
a further portion of this water vapour comes into contact with the cylinder wall of the cylinder. In particular when this cylinder wall is still relatively cold when the internal combustion engine has only just been started and has not warmed up yet. On this relatively cold cylinder wall, the water vapour condensates to form a film of liquid water extending over a surface of the cylinder wall.
Data Source
AI summary
An internal combustion engine includes a cylinder defining a combustion chamber enclosed by a cylinder wall, a piston that is arranged inside the combustion chamber and moveable in a reciprocating motion away from and towards a crankshaft, and at least one first scraper ring defining an oil scraper ring that is arranged between the piston and the cylinder wall and configured to scrape oil off from the cylinder wall when the piston moves towards the crankshaft. The internal combustion engine further includes at least one second scraper ring defining a condensation fluid scraper ring that is arranged between the piston and the cylinder wall and configured to scrape a condensation fluid off from the cylinder wall when the piston moves away from the crankshaft.