A gas turbine abruptly tripped to a stop during its daily morning start-up period. Out of a total of 81 blades in the first row only one blade was broken at its root. Prior to this accident, there were three blade failure accidents in the same plant during the last 10 years. First, the fracture surface of the troubled blade was investigated. Stress analysis of the blade showed that the maximum ...

The compatibility between a composite beam cross-sectional analysis based on the variational asymptotic approach, and a helicopter rotor blade model which is part of a comprehensive rotorcraft analysis code is examined. It was found that the finite element cross-sectional analysis code VABS can be combined with a moderate deflection rotor blade model in spite of the differences between the form...

In the first paper of this report “Toward phonetically grounded distinctive features. Part I: Acoustic-articulatory correlations in a four-region model of the vocal tract”, the formant frequencies F1–F4 and the quality (or gain) factors Q1–Q4 are correlated with the positions, areas, or area ratios formed by the four active articulators: tongue root, tongue body, blade, lips. Among the findings...

Centrifugal pumps are used in cooling the engine by pumping water as coolant into the engine. The normal function of the coolant is to discharge coolant at a specific velocity into the engine coolant volume, once the coolant crosses 150 C temperatures then it is taken to the radiator for cooling to 50 C. Due to changes in the engine design it is desired to have changes in the centrifugal pump d...

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In order to develop a sustainable economy based on the efficient use of green energy resources, it is necessary research and innovate systems such as wind turbines. this paper, new configuration for vertical axis turbines was proposed numerically analyzed using CFD methods. The concept solving starting problem lift-based consists three blades with different chords, arranged at radii so that int...

Proefschrift ingediend tot het behalen van de academische graad van Doctor in de Psychologische Wetenschappen 2005 " I've seen things you people wouldn't believe… " Roy Batty in Ridley Scott's Blade Runner Is word processing in reading serial or parallel? 21 Low-level oculomotor factors versus higher-level cognitive processes 22 How much information is extracted from the right of the fixation? 24

In this paper the design, fabrication and analysis of behavior by full-scale ver-ification testing for the tail rotor blade of composite laminated materials for a heavy transport helicopter is given. The verification test program for the tail rotor blade encompassed static and dynamic test-ing. The static tests of the blade involved experimental evaluation of torsional and flexional blade stif...

This paper presents the application of a viscous adjoint method to the multipoint design optimization of a rotor blade through blade profiling. The adjoint method requires about twice the computational effort of the flow solution to obtain the complete gradient information at each operating condition, regardless of the number of design parameters. NASA Rotor 67 is redesigned through blade profi...

This paper studies the relationship between unsteady flow features and instantaneous torque and power performance of straight bladed vertical axis wind turbine at variable tip speed ratios. The rotor unsteady flow field simulation was carried out by using computational fluid dynamics method. The flow physics and the principle of changing flow filed acting on torque performance and power perform...