Rotating Barrel Engine with Dwell Phase Combustion
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Solution Overview
Problem
Internal combustion engines, particularly barrel-type engines with rotating cylinder banks, face inefficiencies in thermodynamic performance, emissions, and power delivery, leading to wasted energy and higher emissions compared to conventional Otto-type engines.
Innovation Solution
The design incorporates a rotating cylinder bank with adjustable orientations and a synchronizing mechanism to create a dwell phase where pistons remain stationary during combustion, maintaining constant volume and optimizing combustion efficiency, and a scavenging system to minimize emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional Otto-type reciprocating engine is used, then the engine structure is simple and reliable, but thermodynamic efficiency is low with about two-thirds of fuel energy wasted
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a stationary cylinder bank to a rotating cylinder bank configuration. The cylinders rotate about a central axis during operation, dynamically changing the spatial arrangement of combustion chambers. This rotation enables continuous optimization of combustion conditions and energy extraction, improving thermodynamic efficiency while managing structural complexity through the dynamic reconfiguration of engine components
Solution Approach 2:
The patent implements parameter changes by modifying the operational parameters of the engine cycle. It employs a five-stroke cycle instead of the conventional four-stroke cycle, introducing an additional expansion stroke to extract more work from the combustion process. This changes the pressure-volume parameters throughout the cycle, increasing the area under the PV diagram and thereby improving thermal efficiency and reducing energy waste
2Loss of energy
If a rotating cylinder bank is used to improve thermodynamic efficiency, then energy waste is reduced, but emissions increase
Solution Approach 1:
The patent applies continuity of useful action through the rotating cylinder bank design that maintains continuous combustion and power generation. The rotation ensures that combustion chambers are continuously exposed to optimal conditions for complete fuel combustion, reducing unburned hydrocarbons and other emissions. The continuous motion also facilitates better mixing and more thorough oxidation of fuel, decreasing harmful emissions while maintaining improved thermodynamic efficiency
3Productivity
If a rotating cylinder bank with dwell phase is used, then combustion efficiency is optimized, but power delivery becomes less smooth
Solution Approach 1:
The patent applies segmentation by dividing the engine into multiple independently rotating cylinders arranged around a central axis. Each cylinder operates in a specific phase of the five-stroke cycle, and the segmentation of power delivery across multiple cylinders compensates for the dwell phase in individual cylinders. This segmentation ensures continuous and smooth power output to the crankshaft while maintaining the combustion efficiency benefits of the dwell phase in each cylinder
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 enhances thermodynamic efficiency, reduces emissions, and improves power delivery by ensuring constant volume combustion and efficient energy transfer, leading to better fuel economy and reduced waste heat.
Implementation Method 1
a compressed air-fuel mixture is combusted within the combustion spaces
Implementation Method 2
combustion takes place. Useful work is generated from the hot, gaseous products of combustion
Data Source
AI summary
An internal combustion barrel engine having rotating cylinders and pistons which together form combustion spaces. The combustion spaces are maintained at a substantially constant volume while a compressed air-fuel mixture is combusted therein.