USE OF GROOVED SURFACES TO IMPROVE HYDRODYNAMIC, CAVITATION AND ACOUSTIC CHARACTERISTICS OF WINGS AND ELEMENTS OF VANE PROPULSION SYSTEMS (REVIEW)

The paper reviews the use of grooved surfaces and sawtooth (chevron) edges to control the flow parameters of the wings, propeller blades and elements of vane propulsion systems operating in both gaseous and liquid media. Particular attention is paid to the physical mechanisms of improving the hydrodynamic, cavitation and acoustic characteristics under the influence of a grooved surface. These mechanisms are associated with a change in the flow structure in the region of the laminar-turbulent transition, the peculiarities of the occurrence of cavitation and acoustic radiation in the region of the outgoing edges. The results of the verification of computational models describing the behavior of the flow taking into account the laminar-turbulent transition, the use of which is necessary for studying flows near a grooved surface, are presented.

Oriented collagen films with high Young's modulus by self-assembly on micrometer grooved polydimethylsiloxane

We report on the fabrication of oriented collagen films by drying a dilute collagen solution on a polydimethylsiloxane (PDMS) substrate with a micrometer grooved surface.

Analysis and optimization of positioning scheme for machining 2.5mm groove

The front bracket of a certain type studied in this subject is a part of the braking system and plays an important role in the braking system. The main parts of the front support are grooved surface, 44.3mm cylindrical surface, M16 threaded hole plane, M16 threaded hole and Ф 12 holes and 2.5mm grooves. These parts are matched with the brake plate, so they have high dimensional accuracy and geometric accuracy. The main content of this paper is to optimize the positioning scheme of the front support when the machining height is 2mm groove, and improve the machining accuracy of 2mm groove.