2 results about "Large ribs" patented technology

The present invention relates to the technical field of hydrodynamics, and particularly relates to a multi-scale wear-resistant superhydrophobic drag-reducing surface and a preparation method thereof, including: a substrate having a drag-reducing surface; the drag-reducing surface includes large ribs with a trapezoidal cross-section and grooves arranged at intervals; small ribs with a rectangular cross-section are provided on both sides of the upper end surface of the large ribs; a superhydrophobic coating is coated on the surfaces of the small ribs, large ribs and grooves. It can solve the problems that the coating on the top of the ribs will quickly fail after mechanical wear and the contact area increases due to water immersion in the grooves, resulting in a decrease in drag-reducing efficiency or even an increase in drag. The preparation of the superhydrophobic coating and the structures of the small ribs, large ribs and grooves is simple and easy to implement, and more excellent drag-reducing stability and efficiency can be achieved.

The application discloses a large-scale LNG ship bilge strong frame structure, which comprises an upper small group, a central group and a lower small group, the upper end of the central group is provided with the upper small group, the lower end of the central group is provided with the lower small group, the central group comprises a strong frame knee plate, a large rib plate opening and a partition rib, the middle part of the end face of the strong frame knee plate is provided with the large rib plate opening, the end face of the strong frame knee plate around the large rib plate opening is provided with the annular partition rib, and the strong frame knee plate is integrally formed. The strong frame structure is integrally manufactured, the large-hole structure is adopted on the strong frame, the design can reduce the panel between the upper rib plate and the lower rib plate, the structure is simpler, and the production cost is reduced.