This paper considers the fundamental design and modeling of the Caltech ducted fan. The Caltech ducted fan is a scaled model of the longitudinal axis of a ight vehicle. The purpose of the ducted fan is the research and development of new nonlinear ight guidance and control techniques for Uninhabited Combat Aerial Vehicles. It is shown that critical design relations must be satis ed in order tha...

The analyzed electrohydraulic servo valve is jet pipe type, is one of the mechatronics component used for precision flow control application. The jet pipe servo valves have one movable nozzle and two collector ports, from where fluid is ducted to the main valve spool. The servovalve analyzed here is basically used in fuel control application in Variable Geometry Actuation System (VGAS) of a gas...

Abstract High-order large eddy simulations are performed to study the performance and flow fields of a ducted wind turbine (DWT) operating at different tip speed ratios. To evaluate effects duct, with same ratios also on corresponding open-rotor turbine. It is found that consistently obtains higher power outputs than counterpart, duct itself enhances turbulence blade trailing-edge vortices but ...

Installing a turbine in duct generally increases the flow through rotor. If there is confinement due to limited water depth, presence of lateral boundaries, or adjacent turbines, further enhancement rotor will be achieved. Extensive studies ducted turbines uni-directional have shown that rotor-based power coefficientCpcan exceed Betz-Joukowsky limit (BJL) for bare turbine, whereas exceedance BJ...

Abstract A novel patented ducted winglet design is compared, using numerical simulations, to an unmodified wing tip and a standard in the context of wind turbine blade. The aim reduce induced drag. This reduction drag, at tip, would be particularly beneficial performance. Throughout comparison, we explore aerodynamic phenomena described patent which claim explain how reduces simulations were ru...

Micro wind energy harvester (MWEH) can provide eco-friendly and sustainable for low-power electric devices like wireless sensors. The performance of the turbine be enhanced by applying a duct with brim. In this work, characteristic study was performed when is applied to MWEH through computational fluid dynamics analysis internal external flow duct. power generation various cases evaluated using...

Renewable energy sources include solar, wind, hydro, geothermal and biomass. Furthermore, ocean is being rapidly harnessed worldwide. In this study, to establish a suitable design method for various bidirectional ducted tidal turbines, instead of using blade element momentum theory CFD, which have been used previously, the turbomachinery was designing turbines. A turbine optimises equipment red...