Wind turbines are important devices that extract clean energy from wind flow. The efficiency of wind turbines should be examined under various working conditions in order to estimate off-design performance. Numerous aerodynamic and structural research works have been carried out to compute aeroelastic effects on wind turbines. Most of them suffer from either the simplicity of the modelling appr...

The control strategies of blade loads are proposed for the characteristics of blade stresses of variable-speed variablepitch wind turbine. Blade loads are divided into two static and dynamic components. The pitch angle and generator torque are controlled by Single neuron PID controller in the static part. Variables are converted from rotational coordinate to fixed coordinate through multi-blade...

A surgical technique using a round-tip scarifier to create smooth scleral bed surfaces was postulated and performed on patients. During dissection in the right-handed direction, the blade should be rotated approximately 15° counter-clockwise around the axis of its handle from the bed-surface plane; the blade is then rotated clockwise for incision in the opposite direction. The handle is simulta...

An attachment of inducer is a powerful method to improve the cavitation performance of a turbo-pump. Cavitation surge phenomena, occurring under the severe suction pressure at a partial flow rate, is focused in the present paper. Flow measurements were carried out at the inlet and outlet sections of a flat-plate helical inducer with the solidity of 2.0 and tip blade angle of 11o by using a tota...

Influence of diffuser vane position on dangerous blade vibration due to blade flow interactions at part load operating condition was investigated in a centrifugal compressor. By means of some measurement and analysis techniques a mechanism of interaction between blade vibration and circumferential flow condition in the impeller with vaned diffuser was determined, which is a cause of dangerous b...

The goal of this project is to report on some computational investigations about the return flow passages. The return flow channel provides the connection and carries the flow between two stages of a multistage centrifugal compressor. Of course, deswirl vanes are indispensable between the inlet and outlet section, because usually the inlet flow angle, which comes from the impeller, is 70◦ − 75◦...

This paper presents a novel model of large-size tilt-rotor aircraft, which can operate as a helicopter as well as being capable of transition to fixed-wing flight. Aerodynamics of the dynamic large-size tilt-rotors based on blade element method is analyzed during mode transition. For the large-size aircraft with turboshaft engines, the blade pitch angles of the rotors are regulated to vary acco...

Development of new technologies and combined with creativity and innovation, plays the fundamental role in developing of any community′s value. Thus, in this research the design and production of hydroforming device was introduced. One of the best and most efficient technologies in the world of metal forming is wind turbine blade producing with hydroforming method which seems as an innovative m...

Single blade centrifugal pump is suitable for transporting sewage water with large obstacles in diameter, which required to achieve high performance. The inlet angle a parameter that affects the performance of single pump. However, selection frequently based on experiences and demonstrates certain arbitrariness. Therefore, six impellers different angles are designed using ANSYS Bladegen NX soft...

Inspired by the tubercles on humpback whale flippers, leading-edge have been incorporated into design of wings and turbine blades in an attempt to improve their hydrodynamic performance. Although promising improvements, especially terms stall performance, demonstrated limited research that exists date, effectiveness seems be influenced base blade. This paper focuses introduction sinusoidal a bl...