Projectile Air Inlets Counter-Rotating Vortices Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aerodynamic projectiles for non-lethal uses face limitations in stability, accuracy, and payload capacity, particularly when used for recreational purposes, due to drag issues and material compatibility with various payloads.
Innovation Solution
The design incorporates a shell with a hemispherical and cylindrical structure, featuring air inlets in the sidewall that promote spin and stability through counter-rotating vortices, and a frangible material composition allowing for efficient payload distribution, including water-based and non-water-based agents, while minimizing drag and ensuring accurate flight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air inlets are added to the sidewall to promote spin and stability, then aerodynamic stability and accuracy are improved, but device complexity increases
Solution Approach 1:
The projectile incorporates air inlets directly into the sidewall structure, allowing air to pass through the shell wall to generate counter-rotating vortices. This porous approach enables spin stabilization without adding complex external mechanisms, resolving the contradiction between improved aerodynamic stability and increased device complexity.
2Productivity
If the shell is made frangible for payload distribution, then payload distribution effectiveness is improved, but shell strength decreases
Solution Approach 1:
The shell is designed with differentiated material properties - the main body maintains sufficient strength for flight, while specific regions are made frangible to enable effective payload distribution upon impact. This local quality differentiation allows the shell to simultaneously achieve both flight integrity and payload distribution effectiveness.
Solution Approach 2:
The projectile employs composite material construction combining materials with different mechanical properties - tougher materials in critical structural regions and more frangible materials in payload distribution regions. This composite approach resolves the contradiction between maintaining shell strength for flight and enabling effective payload distribution.
3Power
If the projectile is designed for higher velocities, then kinetic energy is improved, but aerodynamic drag increases
Solution Approach 1:
The projectile features a hemispherical nose and streamlined cylindrical body with optimized curvature profiles. This spheroidal design reduces aerodynamic drag by minimizing flow separation and turbulence, enabling the projectile to maintain higher velocities with reduced energy loss, thus resolving the contradiction between kinetic energy and aerodynamic drag.
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 enhances the aerodynamic stability and accuracy of the projectile, enabling it to carry a variety of payloads effectively and maintain stability at higher velocities, with improved kinetic energy and payload capacity compared to prior art projectiles.
Implementation Method 1
air inlets in the sidewall that promote spin and stability through counter-rotating vortices
Data Source
Figure 1~3
Figure 4~6
Figure 7
AI summary
A projectile has a front portion, a divider and a cylindrical portion. The front portion has a wall defining an interior cavity, which is closed by the divider. The cylindrical portion comprises a cylindrical sidewall having an outer surface and an inner surface. The projectile also has a plurality of depressions in the cylindrical sidewall. The depressions have an outlet adjacent the second end, an inlet toward the first end and a neck area between the inlet and the outlet. A width of the inlet is smaller than a width of the outlet. The depressions at the neck area have a curved sidewall, but a generally straight sidewall between the neck area and the outlet. The surface of the depression extends at a ramp angle from the outer surface of the sidewall at the inlet of the depression toward the inner surface of the sidewall at the outlet.