Laminar Flow Piston Cooling Nozzle Design
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Solution Overview
Problem
Traditional reciprocating engine systems inadequately regulate the temperature of pistons and associated components, leading to reduced efficiency due to overheating, which is not effectively addressed by existing cooling systems.
Innovation Solution
A piston cooling system that utilizes a nozzle with laminar flow features to inject cooling fluid jets at a velocity exceeding the mean piston speed, ensuring laminar flow and reducing divergence, thereby enhancing oil capture and thermal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional cooling systems are used, then the structure is simple, but the piston temperature regulation is inadequate leading to overheating
Solution Approach 1:
The patent changes the flow regime parameter from turbulent to laminar by carefully controlling the Reynolds number (Re < 2040) through specific nozzle design parameters including opening diameter, flow velocity, and fluid properties. This parameter change transforms the cooling mechanism from ineffective turbulent flow to effective laminar flow that maintains coherence and directs cooling oil precisely to the piston crown.
Solution Approach 2:
The invention applies cooling locally by directing laminar jets of cooling oil specifically to the piston crown area through precisely positioned nozzle openings. The cooling effect is concentrated where it is most needed (piston crown) rather than distributed broadly, achieving effective temperature regulation at the critical hot spot.
2Speed
If cooling fluid is injected at high velocity, then cooling effectiveness improves, but flow turbulence increases reducing laminar flow quality
Solution Approach 1:
The patent resolves this contradiction by optimizing the velocity parameter within a specific range that satisfies both requirements. The jet velocity is controlled to exceed piston speed for effective cooling delivery while simultaneously maintaining Reynolds number below 2040 to preserve laminar flow stability. This dual parameter optimization achieves both high cooling effectiveness and flow regime stability.
3Quantity of substance
If the nozzle opening is enlarged to increase flow rate, then more cooling fluid reaches the piston, but laminar flow condition is compromised
Solution Approach 1:
The patent resolves this contradiction through multi-parameter optimization: the nozzle opening diameter is specifically sized (0.02-0.05 inches), the number of openings is optimized (2-6 openings), and the jet velocity is controlled to maintain Reynolds number below 2040. This combination of parameter changes allows sufficient cooling oil quantity to reach the piston while preserving the laminar flow regime through coordinated design of multiple parameters rather than relying on a single parameter adjustment.
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 system effectively cools the piston by increasing oil capture rate and efficiency, reducing susceptibility to thermal cracking, and improving thermal control precision.
Implementation Method 1
The first flow opening and the second flow opening are sized to enable laminar flow of corresponding first and second jets of the cooling fluid discharged through the first and second flow openings, respectively
Data Source
AI summary
A nozzle of a piston cooling system includes a flow path defined by a structure of the nozzle and configured to receive a cooling fluid, a first flow opening fluidly coupled with the flow path and extending through the structure of the nozzle, and a second flow opening fluidly coupled with the flow path and extending through the structure of the nozzle. The first flow opening and the second flow opening are sized to enable laminar flow of corresponding first and second jets of the cooling fluid discharged through the first and second flow openings, respectively.