Piston Body Surface Features for Boundary Layer Heat Management
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Solution Overview
Problem
Traditional internal combustion engines in large vehicles face inefficiencies in power generation and heat management, particularly when operating on varying terrain and loads.
Innovation Solution
The use of a closed-cycle engine with a piston assembly featuring a piston body having surface features like ripples, which interact with the boundary layer to enhance heat management and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a traditional smooth piston body is used, then the engine structure is simple and easy to manufacture, but heat losses across the piston body's exterior surface are high and power density is reduced
Solution Approach 1:
The piston body incorporates surface features (ripples, dimples, or protrusions) only on specific exterior surfaces where heat losses occur, rather than modifying the entire piston structure. This localized modification reduces heat losses while maintaining the simplicity of the overall piston design and minimizing manufacturing complexity increases.
Solution Approach 2:
The surface features on the piston body incorporate curved geometries such as ripples, dimples, or protrusions that create boundary layer interactions. These curved surface features enhance heat management by manipulating the boundary layer flow patterns across the piston exterior, reducing heat losses without requiring complex mechanical structures.
2Power
If a traditional smooth piston body is used, then the manufacturing process is simple, but power density is reduced
Solution Approach 1:
The piston body incorporates surface features that create micro-scale structures (ripples, dimples, or protrusions) on the exterior surface. These micro-structures interact with the boundary layer to enhance power density while being manufacturable through conventional processes such as machining, molding, or additive manufacturing, thus not significantly complicating the manufacturing process.
Solution Approach 2:
The invention adds surface dimensionality to the piston body by incorporating three-dimensional surface features (ripples, dimples, or protrusions) on the exterior surface. This dimensional enhancement increases power density by manipulating boundary layer flow, while the features can be integrated into standard piston manufacturing processes without requiring entirely new manufacturing approaches.
3Temperature
If surface features are added to the piston body, then heat management is enhanced, but the piston body structure becomes more complex
Solution Approach 1:
Heat management enhancements are achieved through localized surface features (ripples, dimples, or protrusions) on specific exterior surfaces of the piston body where heat losses occur. This localized approach improves heat management while minimizing the overall structural complexity of the piston, as only specific regions are modified rather than the entire component.
Solution Approach 2:
Curved surface features such as ripples, dimples, or protrusions are incorporated on the piston exterior to enhance heat management through boundary layer interaction. These curved geometries effectively manage thermal characteristics while maintaining a relatively simple piston structure, as the curvature is applied as a surface treatment rather than a structural modification.
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
The solution improves power density and reduces heat losses across the piston body's exterior surface, leading to enhanced engine efficiency and performance in large vehicles.
Implementation Method 1
a piston body with surface features, such as ripples, for interacting with a boundary layer thereof
Data Source
AI summary
A linear electric machine includes a shaft and at least one piston assembly operably coupled with the shaft. The piston assembly includes a piston, a piston body, and an expansion chamber. The piston body defines a dome structure at the expansion chamber. The piston is a domed piston corresponding to the dome structure. The linear electric machine also includes a heater body positioned at an outer end of the expansion chamber adjacent to the dome structure. The piston body further defines an exterior surface corresponding to a shape of the dome structure. The exterior surface includes a plurality of surface features protruding therefrom and is arranged between the heater body and the dome structure. The plurality of surface features decrease a heat load across the exterior surface of the piston body.