Using Machine Hammer to Reduce Friction in Turbulent Fluid Flows

摘要

In 2012 a new approach of implementing riblet-structures in metal surfaces in order to generate the so called Shark Skin Effect was presented. With such surface structures drag reduction in turbulent fluid flows is possible. The structures were realized using the machine hammer peening surface treatment technology. At the end of the paper "Using Machine Hammer Peening to Realize Defined Surface Structures in Order to Reduce Friction in Turbulent Fluid Flows" in 2012, further directions of research were suggested. In the following paper the implementation of appropriate structures for hydraulic machines and also the investigation of a structured free form surface are described in detail.