1results about How to "Easy resistance" patented technology

This invention provides a variable-parameter drag-reducing device for a cylindrical body with a perforated cover, comprising a cylinder and a perforated cover. The perforated cover is fitted over the outer layer of the cylinder, and the perforated cover and the cylinder are aligned along the same centerline. The perforated cover completely encloses the cylinder. The perforated cover includes an outer cover and an inner cover. The outer cover can rotate relative to the inner cover around the centerline. Both the outer and inner covers have multiple through holes. When the outer cover rotates relative to the inner cover around the centerline, the overall porosity of the perforated cover can be adjusted. The length of the separation zone at the rear of the device is significantly increased, and the vortex shedding suppression effect is significant, resulting in increased pressure on the leeward side of the cylinder and reduced drag. Simultaneously, a significant vibration reduction effect is achieved. This invention further explores the influence of parameters such as the size of the perforated cover and changes in porosity on the overall drag-reduction effect, providing guidance for the design of perforated covers.