Ball Surface Projections Stabilize Aerodynamic Path
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Solution Overview
Problem
Conventional balls experience uncontrollable paths when traveling through the air without spin due to the generation of Karman vortices caused by laminar boundary layer separation, leading to vertical or lateral displacement.
Innovation Solution
The ball is designed with projections that forcibly separate the laminar boundary layer and transition it to a turbulent boundary layer, preventing Karman vortices by arranging the projections upstream of the laminar boundary layer separation point, ensuring the turbulent boundary layer separates further downstream, thereby stabilizing the ball's path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional smooth ball is used, then the ball surface is simple and easy to manufacture, but the ball forms a vertically and/or laterally displaced path when traveling through the air without spin due to Karman vortex generation
Solution Approach 1:
The patent applies local quality by adding projections only at specific locations on the ball surface rather than making the entire surface rough. The projections are positioned at predetermined locations to locally affect boundary layer behavior without complicating the overall manufacturing process. This resolves the contradiction by maintaining manufacturing simplicity while achieving path stability through localized modifications.
Solution Approach 2:
The patent changes the surface parameter by introducing projections with specific geometric characteristics (size, shape, distribution) to modify the aerodynamic properties. By controlling parameters such as projection height, diameter, and spacing, the ball transitions from laminar to turbulent boundary layer at desired locations, suppressing Karman vortex formation while keeping the surface structure relatively simple for manufacturing.
2Reliability
If projections are added to the ball surface to suppress Karman vortex, then path stability is improved, but the ball structure becomes more complex
Solution Approach 1:
The projections are implemented at predetermined specific locations on the ball surface rather than uniformly across the entire surface. This localized approach achieves path stability by affecting boundary layer transition at critical positions while minimizing overall structural complexity. The selective placement reduces the number of projections needed compared to a fully covered surface.
Solution Approach 2:
The patent applies partial action by using a limited number of projections at strategic locations rather than covering the entire ball surface. This partial implementation is sufficient to suppress Karman vortex formation and stabilize the ball path, avoiding the complexity that would result from a fully textured surface while maintaining the desired aerodynamic effect.
3Reliability
If the laminar boundary layer separates from the ball surface, then Karman vortex is generated causing path displacement, but preventing separation increases drag
Solution Approach 1:
The projections are positioned upstream of the natural boundary layer separation point to preliminarily trigger transition from laminar to turbulent boundary layer. This preliminary action occurs before the separation point, allowing the turbulent boundary layer to remain attached longer and delay separation to a downstream location. The result is suppressed Karman vortex formation without excessive drag increase, as the separation is delayed rather than completely prevented.
Solution Approach 2:
The patent changes the boundary layer parameters by using projections to modify the transition point and separation characteristics. The projections alter the Reynolds number distribution and boundary layer thickness at critical locations, enabling controlled transition to turbulent flow that delays separation. This parameter modification achieves path stability while managing drag through optimized boundary layer behavior rather than complete attachment.
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 design improves controllability and reduces drag, allowing the ball to maintain a stable path and increase travel distance even when not spinning, by suppressing Karman vortices and transitioning to a turbulent boundary layer.
Implementation Method 1
when the ball travels through the air without spin, a laminar boundary layer is generated on the surface of the ball
Implementation Method 2
the laminar boundary layer, which is generated on the surface of the ball traveling through the air without spin, is transitioned to the turbulent boundary layer
Implementation Method 3
a laminar boundary layer is generated on the surface of the ball body, though it is not generated on the spinning ball. The laminar boundary layer gradually develops in a downstream direction along the surface of the ball, and separates from the ball surface at a predetermined position
Implementation Method 4
Depending on conditions, the Karman voltex is generated behind the ball when the laminar boundary layer separates
Data Source
AI summary
A ball includes a ball body having a spherical surface, and at least one projection extending from the surface of the ball body. The projection extends in such a manner that the projection forcibly separates a laminar boundary layer generated on the surface of the ball body, and transitions the laminar boundary layer to a turbulent boundary layer.