This work aimed to investigate the turbulence characteristics behind different parts of wind turbine blade. Airfoils S807, S813, S817, and S803, which characterize shape blade at lengths, were selected for estimation. During experiment, chord-based Reynolds number was 2.6×10 5 , while angle attack zero. Measuring crosssections placed trailing edge x ·c -1 ≈0.2, 0.4 1.0. For determination flow t...

Wild chrysanthemum has a high medicinal value. Its mechanized harvest can improve harvesting efficiency, reduce labor costs and planting benefits, which is an important way to promote artificial planting. However, one of the difficulties in large diameter hardness stem, leading cutting resistance power consumption. In order consumption, bionic blade designed this paper by employing bionics prin...

In this paper, fracture morphology observation, microstructure analysis, standard corrosion test, and other experimental methods are used to analyze the causes of cracking steam turbine blades (0Cr19Ni9) produced by a certain company. The results showed that cracks appeared during operation blade. A large number dimples were observed under scanning electron microscope, almost all which shear di...

The effect of inlet pre-swirl on the performance a centrifugal pump is studied by numerical simulation. governing equations are Navier–Stokes and shear stress transport k–ω turbulence model. results show that optimal operating point moves from low flow region to high as angle shifts positive negative. It found contours Omega–Liutex able weaken vortex blade suction reduce energy dissipation. On ...

Near-wake characteristics of a turbine play an important role in turbine–wake interactions and performance assessment arrays. In this study, the near-wake flow behind laboratory-scale tidal stream is simulated compared with experimental data. An actuator-line model used to represent rotating blades. Further, two physics-based turbulence corrections are proposed for unsteady Reynolds-averaged Na...

A three-bladed, dual-axis teetering hub (3T) has been developed and compared to a three-bladed rigid (3R) using computer modeling. Both hubs were fitted hypothetical 5-MW offshore wind turbine mounted on an floating platform. Cyclic analysis showed the 3T significantly reduced impact of shear blades virtually eliminated both turbulence main shaft bearing yaw bearing. Lifetime fatigue studies fo...

Explicit formulas are given for the hydrodynamic slip lengths associated with longitudinal shear flow over a superhydrophobic grating where menisci have partially invaded cavities and only weakly curved. For flat that depinned from top of displaced downwards into cavities, axial velocity is determined analytically length extracted it. This solution then combined an integral identity to determin...

Since double-suction centrifugal pumps consume quantities of energy, revealing critical factors for energy dissipation is helpful energy-saving design. This study aims to investigate the relationship between and vortex based on Rortex method in a pump. Detached eddy simulation was applied obtain flow field. Enstrophy used present strength local rigid shear. The results indicate that shear domin...

As the size and weight of blades increase with recent trend toward larger wind turbines, it is important to ensure structural integrity blades. For this reason, blade consists an upper lower skin that receives load directly, a shear web supports two skins, spar cap connects web. Loads generated during operation turbine can cause debonding damage on cap-shear joints. This may change stiffness le...