Hemispherical Combustion Chamber Roof Curvature
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Solution Overview
Problem
Internal combustion engines face challenges in achieving optimal combustion efficiency due to suboptimal combustion chamber geometries, which affect turbulent kinetic energy and burning rates, leading to incomplete fuel combustion and reduced thermodynamic efficiency.
Innovation Solution
The design features a combustion chamber with a hemispherical geometry, characterized by curved cylinder head sections and a recessed piston, creating an edge-free active area that enhances tumble flow and maintains turbulent kinetic energy, along with strategically placed valve seats and a masking to optimize flame propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional combustion chamber geometries are used, then manufacturing is simpler, but turbulent kinetic energy and combustion efficiency deteriorate
Solution Approach 1:
The combustion chamber roof is designed with a hemispherical geometry featuring curved cylinder head sections that create an edge-free active area. This spherical curvature optimizes flow behavior and generates turbulent kinetic energy during the intake process, significantly improving combustion efficiency compared to conventional flat or angular designs.
Solution Approach 2:
The combustion chamber roof incorporates localized features including squish areas positioned at specific locations, curved cylinder head sections between valve seats, and an edge-free active area. These localized geometric modifications create optimal flow patterns and turbulence in critical regions without requiring complete redesign of the entire combustion chamber.
2Manufacturing precision
If curved cylinder head sections are added to create hemispherical geometry, then flow behavior and turbulent kinetic energy improve, but manufacturing complexity increases
Solution Approach 1:
The curved cylinder head sections are designed to form a hemispherical combustion chamber roof geometry. This curvature is implemented through precision machining or casting processes that can reproduce the spherical shape consistently, achieving high geometric precision while managing manufacturing complexity through standardized production methods.
3Productivity
If squish areas are provided only on two opposing edge sections, then tumble flow is optimized, but valve seat area is reduced
Solution Approach 1:
Squish areas are strategically positioned only on two opposing edge sections of the combustion chamber roof, creating localized flow control zones that generate tumble motion without interfering with valve seat functionality. This localized approach optimizes combustion efficiency while preserving adequate valve seat area for proper valve operation.
Solution Approach 2:
The combustion chamber roof is segmented into distinct functional zones: curved cylinder head sections for overall hemispherical geometry, localized squish areas at opposing edges for tumble flow generation, and valve seat regions for valve operation. This segmentation allows each zone to perform its specific function optimally without compromising others.
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 results in improved burning rates, complete fuel combustion, and enhanced thermodynamic efficiency with reduced fuel consumption, ensuring that the internal combustion engine operates with high efficiency and minimal unburned fuel.
Implementation Method 1
The turbulent kinetic energy results from the flow behavior of the mixture and is significantly influenced by the geometry of the combustion chamber
Implementation Method 2
This results in a combustion chamber shape that is especially favorable with regard to the combustion process, namely a spherical shape. The two curved cylinder head sections are thus both located between the intake and exhaust sides of the cylinder head, so that they both contribute approximately equally to improving the flow characteristics.
Implementation Method 3
As the piston moves upwards, particularly towards the cylinder head, the mixture in the combustion chamber is compressed
Implementation Method 4
When the piston reaches top dead center, a spark plug located in the cylinder head ignites the mixture by creating an initial flame
Implementation Method 5
a mixture consisting of at least air and fuel is burned
Data Source
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AI summary
Disclosed is an internal combustion engine (10) for a motor vehicle, having at least one cylinder (12), a cylinder head (14) and a piston (16) which is movably mounted in the cylinder (12) and has a combustion chamber side (18) which delimits a combustion chamber (20) with the cylinder head (14) and the cylinder (12), wherein the cylinder head (14) has a combustion chamber roof (21), in which at least two valve seats (22, 24) for at least one inlet valve (26) and at least one outlet valve (28) are provided, and wherein the combustion chamber roof (21) has at least one arched cylinder head section (46, 47) which is arranged between the at least two valve seats (22, 24) and points away from the combustion chamber (20).