Lift force is an important parameter for the performance evaluation of H-Darrieus wind turbine. The rotational direction streamlined effective on In order to analyze flow characteristics around turbine blades in real-time, a numerical analysis using three-dimensional unsteady Reynold-averaged Navier–Stokes equations has been introduced. Experimental data were obtained from field test facility c...

in many industrial equipment such as boilers and heat exchangers, the cylindrical tubes are exposed to the gas- liquid two phase flow. for any immersed body in flow field vortex shedding is created with a frequency that may be constant or variable, according to conditions such as flow rates, geometry of body, and etc. the failure will happen in the equipment, when this frequency is close to one...

In this case study, we examine the effect of airfoil shape/camber on formation and existence stall cells. A series experiments using a NACA0012 wing with trailing-edge flap has been carried out over range angles attack ( $11.5^\circ$ – $21^\circ$ ), $0^\circ$ , $5^\circ$ $10^\circ$ ) chord-length-based Reynolds numbers (100 000–500 000). The influence these parameters cell explored. Tufts have ...

Gas-driven sorption heat pumps (GDSHPs) exhibit possibilities in the reduction of energy use and environmental impact of heating systems that utilise natural gas. By utilising renewable thermal energy from the environment, that is, air, ground or water sources, significant reduction of primary energy use can be achieved. However, high cost, low coefficient of performance (COP) and large volume ...

edge modifications on the flow and forces on an untapered wing of 50 deg leading-edge sweep, at stream Mach numbers between 0.60 and 1.20. Seven leading-edge profiles were tested, ranging from a drooped extension of 18 per cent of the chord of the basic sharp-nosed section to a round-nosed section with a leading-edge radius of 1.0 per cent of the basic chord. Leading-edge droop was found to inc...

This paper gives a quantitative account of the influence slipstream on aerodynamic performance contrarotating propeller (CRP)/wing system, and compares it with CRP clean wing. To accurately evaluate complex interaction, unsteady Reynolds-averaged Navier–Stokes approach using sliding mesh method is performed at typical freestream velocity 30 m/s. Four different critical parameters, including ang...

A series of RANS-based aerodynamic shape optimization for an 800-passenger blended-wing-body aircraft is performed. A gradient-based optimization algorithm and a parallel structured multiblock RANS solver with Spalart–Allmaras turbulence model are used. The derivatives are computed using a discrete adjoint method considering both frozen-turbulence and full-turbulence assumptions. A total of 274...

The wings of many insect species including crane flies and damselflies are petiolate (on stalks), with the wing planform beginning some distance away from the wing hinge, rather than at the hinge. The aerodynamic impact of flapping petiolate wings is relatively unknown, particularly on the formation of the lift-augmenting leading-edge vortex (LEV): a key flow structure exploited by many insects...