The main limitation of centrifugal pump running in turbine mode is lower efficiency at part load operating conditions as compared to conventional hydro turbines. To enhance the utilization of pump as turbine (PAT) in mini/micro hydropower plants, it is very important to improve its performance with some low cost modifications. The part load efficiency of PAT can be improved by guiding the flow ...

Centrifugal blood pumps have provided a powerful artificial support system for patients with vascular diseases. In the design process, geometrical optimization is usually needed to acquire more biocompatible model clinical uses. current paper, we propose method multi-objective concerning both hydraulic and hemolytic performances of pump based on near-orthogonal array in which traditional hemoly...

In recent years, researchers have put a considerable effort to increase the eff iciency in a centrifugal pump .The current scenariointhe impeller design interest has considerably increased in recent years in various publication, statingthe pump eff iciency, pump performance, impeller design, modif ication the vane angle through CFD analysis has consideration to elaborate the conceptual frame wo...

Thermal stress, wear and material damage produce effects of high-cycle fatigue failures in aircraft engines. The loading configuration on turbine blades of aircraft engines consists of an axial load. The axial load is the centrifugal force combined with the tensile and compressive loads, caused by the natural vibrations of the blades themselves. Low-cycle fatigue and high-cycle fatigue loading ...

For flow conduits with mild slope and considerably large vertical curvatures the hydrostatic distribution of the pressure may be used for design proposes. However, for the spillway chutes actual pressure load over the steep slope beds with small vertical curvatures may differ from the hydrostatic pressure values. The differences in pressure load on curved bed chutes are mainly because of the ce...

The lecture presents an overview of some recent results of the work carried out at Alta on the hydrodynamic design and rotordynamic fluid forces of cavitating turbopumps for liquid propellant feed systems of modern rocket engines. The reduced order models recently developed for preliminary geometric definition and noncavitating performance prediction of tapered-hub axial inducers and centrifuga...

Journal bearings are widely used to support the rotor of industrial machinery with high loads, such as steam turbines, centrifugal pump and compressors. The problem of journal bearings can cause catastrophic failures, results in huge economic loss and create high safety risks. It is necessary to develop effective condition monitoring technologies to detect and diagnose the failures at early sta...

This paper provides a feedforward control method for controlling the load vibration of a rotary crane using a straight transfer transformation (STT) model. The parameters of the model were geometrically derived. The minimum time control problem was solved for the revised STT model by means of both clipping-off technique for the constraints of control inputs amplitude and the Bisection Method. P...