Dental structures capture, retain and fragment food for ingestion. Gnathostome dentition should be viewed in the context of the prey's material properties. Animal muscle and skin are mechanically tough materials that resist fragmentation unless energy is continually supplied directly to the tip of the fracture by some device such as a blade edge. Despite the variety of bladed tooth morphologies...

The aim of the present study was to find a more optimal blade design for rowing performance than the Big Blade, which has been shown to be less than optimal for propulsion. As well as the Big Blade, a flat Big Blade, a flat rectangular blade, and a rectangular blade with the same curvature and projected area as the Big Blade were tested in a water flume to determine their fluid dynamic characte...

Details of pressure distributions, on a two dimensional airfoil oscillating in pitch through stall, in a 0.8 0.8 m low-speed wind tunnel are presented. Pitching occurred about the airfoils quarter-chord axis. Pitch rate, Reynolds number, and oscillation amplitudes were varied to determine the effects on pressure and lift distributions. It was found that mean angle of attack and pitching amplitu...

Pitch regulation plays a significant role in improving power performance and achieving output control wind turbines. The present study focuses on novel, pitch-regulated vertical axis turbine (VAWT) with inclined pitch axes. effect of two parameters (the fold angle the incline angle) instantaneous aerodynamic forces overall straight-bladed VAWT under tip-speed ratio 4 is investigated using an ac...

This paper presents results of experimental investigations and numerical simulations a vertical-axis H-type wind turbine, considering the influence propeller blade pitch angle on turbine characteristics. An innovative airfoil profile based modified symmetric NACA0015 was used as designed profile, which tested in tunnel over range Reynolds numbers from 50,000 to 300,000. The phenomenon angle-of-...

In this paper, an optimization approach of a small horizontal axis wind turbine based on BEM theory including De Vries and Shen et al. tip loss corrections is proposed. The optimal blade geometry was obtained by maximizing the power coefficient along using angle attack speed ratio. Newton’s iterative method applied to axial induction factor used solve problem. This study conducted for NACA4418 ...

Over the centuries, energy has been supplied by wood, coke, coal, oil and natural gas, as well as by uranium (nuclear energy). All these energy sources are limited and at the same time these energy sources create pollution problems. This has led to the focus on a sustainable energy supply, which implies optimized use of energy, minimized pollution. That is why wind energy is prominent and it is...

This contribution presents a numerical analysis based on the effects of aerodynamics bump-based humpback whale fins available turbine blade edge. In this research, performance comparisons have been made dual sequestered blades. One blades was sinusoidal in shaped with Bumped Lead Edge (BLE) and other one Upright Leading (ULE). However, all are similar cross-sectional profile i.e. NACA-012. rese...

Vertical axis turbines, also called Darrieus present interesting characteristics for offshore wind and tidal applications but suffer from vibrations a lower efficiency than the more conventional horizontal turbines. The use of variable pitch, in order to control angle attack blades continuously during their rotation, is considered this study overcome these problems. 2D blade-resolved unsteady R...