in this research, the steady-state flow filed around a 3d body and rotor configuration of the robin helicopter is simulated. the rotor is modeled by an actuator disk. for this purpose, an annular computational domain replaces the rotor and some modeled source terms are added to the momentum equations. this modeling of rotor considerably speed up computational time. the flow field over this heli...

in this research work with the aid of tagouchi experimental design and rawing of interaction curves with minitab software, the best rotor speed and dump temperature of mixing for physico-mechanical and rheological properties of the rubber compound with three mixing steps was obtained. moreover by plotting the mean curves in excel worksheet, the dependency of properties on rotor speed, dump temp...

We analyze a deterministic form of the random walk on the integer line called the liar machine, similar to the rotor-router model, finding asymptotically tight pointwise and interval discrepancy bounds versus random walk. This provides an improvement in the best-known winning strategies in the binary symmetric pathological liar game with a linear fraction of responses allowed to be lies. Equiva...

The effect of cup anemometer shape parameters, such as the cups' shape, their size, and their center rotation radius, was experimentally analyzed. This analysis was based on both the calibration constants of the transfer function and the most important harmonic term of the rotor's movement, which due to the cup anemometer design is the third one. This harmonic analysis represents a new approach...

In this study, the entropy theory was used as evaluation standard of energy dissipation, and effect backflow clearance (the gap between motor rotor shell) on characteristics a full tubular pump investigated by 3D unsteady flow simulation. The calculated results validated through testing shows that produces additional head loss rotation requires more shaft power. losses lead to significant decli...

The Short-Haul-Civil-tiltrotor (SHCT) component of the NASA Aviation System Capacity Program is an effort to develop the technologies needed for a potential 40-passenger civil tiltrotor. The variable diameter tiltrotor (VDTR) is a Sikorsky concept aimed at improving tiltrotor hover and cruise performance currently limited by disk loading that is much higher in hover than conventional helicopter...

In order to harness the kinetic energy of marine currents, we propose a novel ocean-current turbine with a horizontal axis. The turbine can be moored to the seabed and function similarly to kites in a water flow. To operate such turbines in a marine current, the resulting rotor torque needs to be canceled. Therefore, the proposed turbine is designed with a float at its top and a counterweight a...

The floating ring bearing (FRB) has been widely used in the field of high-speed rotating machinery such as turbochargers, aviation engines and so on, because its simple structure, high efficiency low power consumption. In order to obtain best ratio between inter-oil clearance shaft radius necessitates design reference dimensional parameters for bearings. This study, based on transfer-matrix met...

This paper investigates the effect of rotor-stator spacing and operating conditions on compressor performance interaction mechanism. We focus between rotor wake stator’s flow field through several unsteady numerical simulations aiming at a transonic stage in equal radius path with two-axial three conditions. The simulation results indicate that time-averaged efficiency almost declined by 0.6 po...