tip leakage loss introduces major part of losses of the rotor in axial gas turbines. therefore, the rotor blade tip has a considerable effect on rotor efficiency. to understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). various blade tip configurations such ...

We present a close coupling study of the bending relaxation H2O by collision with He, taking explicitly into account bending–rotation within rigid-bender close-coupling method. A 4D potential energy surface is developed based on large grid ab initio points calculated at coupled-cluster single double triple level theory. The bound states energies He–H2O complex are computed and found to be in ex...

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...

Abstract Multi‐rotor floating wind turbines are among the innovative technologies proposed in last decade effort to reduce cost of energy. These systems able offer advantages terms smaller blades deployed offshore, cheaper operations, fewer installations, and sharing platform. As blade‐pitch actuation system is prone failures, assessment associated load scenarios commonly required. Load fault h...

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...

In most of the piezoelectric stacked motors studied, stator usually adopts two compound modes to drive rotor do step motion. This design method not only improves utilization rate but also torque output a certain extent and increases displacement. this study, new type multi-degree freedom actuator is proposed for stator. The realizes three vibration bending-longitudinal-bending on single stator,...

Abstract Turbochargers have been widely used in various base conditions, such as horizontal, vertical, or inclined. The prediction of the dynamics is utmost importance to inclined turbocharger designers. In this paper, effect weight on critical speed an rotor coupled with floating ring bearings investigated. modeled by lumped mass model. nonlinear bearing model derived using Capone’s Then dynam...