Ducted wind turbines are a kind of small wind turbine having a diffuser or any other shape around the rotor which increases the air flow through the blades and absorbs more power. In the present study, a small wind turbine was ducted with a relatively simple ring and its performance was investigated in a wind tunnel. The duct is shaped using rolling steel sheets on a sloping surface and finally...

Unlike conventional hydro and tidal barrage installations, water current turbines in open flow can generate power from flowing water with almost zero environmental impact, over a much wider range of sites than those available for conventional tidal power generation. Recent developments in current turbine design are reviewed and some potential advantages of ducted or “diffuser-augmented” current...

The ducted coaxial propeller (DCP) has great application value in eVTOL aircraft because of its high safety, compactness, and low noise. A numerical simulation method for the DCP is established using sliding mesh technique. was designed manufactured lift power test to verify method. characteristics airflow separation inside were studied, influence vortex restrain ring (VRR) on suppression augme...

Rejuvenation procedures, especially facelift are nowadays common type of cosmetic surgery. According to the statistical data, facelifts were the seventh most popular aesthetic surgery performed after liposuction, breast augmentation, blepharoplasty (eyelid surgery), abdominoplasty (tummy tuck), breast reduction and rhinoplasty. The most common complication after surgery is bleeding. Less common...

A numerical simulation is performed to study the effect of two types vortex generators (VGs) on heat transfer coefficient and pressure drop in duct. There are V.G., one concave V.G. other rectangular. The aim observe effects shape arrangement this V.Gs channel increase with Reynolds number range from (300 1500). Both were placed 45o angle attack, an line staggered position. results shows that p...

a CNRS, LAAS, 7 Avenue du Colonel Roche, F-31400 Toulouse, France b Univ de Toulouse, UPS, LAAS, F-31400 Toulouse, France c Université de Lyon, CNRS, Laboratoire AMPERE, UMR 5005, INSA de Lyon, F-69621 Villeurbanne, France d Institut de Microelectrónica de Barcelona-Centre Nacional de Microelectrónica (IMB-CNM), Consejo Superior de Investigaciones Científicas (CSIC), Universitat Autònoma de Bar...

The effects of using a wind acceleration device (wind lens) with vertical-axis wind turbines in wind tunnel experiments were examined. A wind lens consists of a diffuser and flanges, and this study investigated the optimum parameters of their configuration with regard to the power augmentation of the turbines. The wind lens with a flat-panel-type diffuser demonstrated power augmentation by a fa...

CFD analysis of 2-dimensional artificially roughened solar air heater duct with additional circular vortex generator, inserted in inlet section is carried out. Circular transverse ribs on the absorber plate are placed as usual. The analysis is done to investigate the effect of inserting additional vortex generator on the heat transfer and flow friction characteristics inside the solar air heate...

Due to long life of steam power plants in Iran, transformation of steam cycles to combined cycles is under consideration. Bandar-Abbas steam power plant with capacity of 320 MW has been analyzed in this work. This old plant is located near the harbor city of Bandar-Abbas at southern Iran. Method of exergy analysis is used to study the current and the repowered systems. Optimum state of the repo...

one of the significant strategies of the power systems is economic dispatch (ed) problem, which is defined as the optimal generation of power units to produce energy at the lowest cost by fulfilling the demand within several limits. the undeniable impacts of ramp rate limits, valve loading, prohibited operating zone, spinning reserve and multi-fuel option on the economic dispatch of practical p...