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From such reasons, the alloy is noticed as the attractive material in various fields. However, the alloy has the weak points that are inferior for heat and corrosion resistance. Therefore, it will be possible to guarantee the safety security of structure parts, if the information on the fracture strain and life, etc. The three type specimens of the virgin, the heat history i. Then, the tensile test was carried out for each specimen, and the AE signals emitted in the testing were detected.

Frequency and fractal dimension analysis were carried out in order to extract the features of those signals.

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From such analysis results, the feature extraction of the signal by the elasticity twin deformation was done, because that deformation participates in the degradation of mechanical properties. As the result, the following things became clear under the experimental condition in this study: The frequency component of the signals caused by that deformation is near kHz. The fractal dimensions Fd of those signal show the value over 1. Then, it was examined whether the fracture strain is evaluated by the Ib value Improved b -value led from the frequency distribution of the Fd.

As the result, the effectiveness of this method proposed under the experimental conditions in this study was confirmed. Therefore, the possibility for the prediction of that strain by the AE signal detected in elastic region was shown.

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Examination of simplified load model on fatigue analysis of small wind turbine blade using aeroelastic analysis. In this research, probabilistic fatigue load estimation by the aeroelastic modeling was carried out for a small wind turbine with 1m diameter. The results were compared with the simplified load model which is a deterministic method, and quantitative evaluation of the difference between two methods was presented.

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An aeroelastic simulation code for 5 bladed wind turbines is used for aeroelastic modeling. On the fatigue analysis, wind condition is set to be IEC Ed. From the time series results from aeroelastic analysis, the load amplitude and cycles are counted. The result from aeroelastic modelling was similar to one from simplified load model in Class I but different in other Classes. The reason is that the fatigue load in high wind speed, which is not encompassed with simplified load model, is dominant for fatigue load with target turbine's model regardless of IEC Class.

Therefore it is important to consider probability of wind speed over all operating condition in fatigue load estimation. Digital holographic particle measurement based on normalized deconvolution. This paper presents a normalized deconvolution approach for a digital holographic particle measurement in order to decrease the elongation of the reconstructed particles along the depth direction. The performance of this approach is evaluated using numerical simulations, and its practicality is experimentally demonstrated.

In the numerical simulations, the performance is evaluated mainly based on the cross-correlation between the true distribution and the deconvolution results. Tests were carried out for two types of recording systems and three kinds of reconstructed information. The results indicate that the most accurate particle images were obtained using the phase-shifting observation method and reconstructed quantities that contain phase information, such as the complex amplitude.

Furthermore, the RMS error in the particle depth position is found to be improved especially for higher number density within the particle distribution.

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Experimental measurements with standard particles confirm that particle elongation along the depth direction can be successfully suppressed using the normalized deconvolution method. The experimental results thus confirm that this method is useful for real particle measurements. Flow field through a gate valve installed in a circular pipe and loss coefficient. The attention as the gate valve model is paid to the gate plate, which is an essential part of the various practical gate valves.

The gate plate has three different fundamental shape types named convex-type, flat-type and concave-type, based on the shape of the plate head projecting from the inner pipe wall. The aim of this study is to clarify the effects of shape, height ratio and thickness ratio of the gate valve plate on the loss coefficient and flow field in the turbulent pipe flow. The height ratio is the relative height defined as the gate-plate height, which is the height from the inner-wall surface to the head along the center line of the valve plate, to the pipe diameter.

It varies from 0. The thickness ratio defined as the gate-plate thickness to the pipe diameter is kept at 0. As a result, the loss coefficient is strongly dependent on the shape type and the height ratio, and is slightly dependent on the thickness ratio. The shape type and the height ratio are able to be replaced by the open-area ratio to estimate the loss coefficient as one parameter independent on them. The necklace vortex is produced in front of the gate valve plate, and they flows downstream above the head of the gate plate.

A three-dimensional recirculating flow region is produced behind the gate plate, and there is a strong secondary flow and a recirculating region longer than the center reattachment length along the symmetrical plane of the valve plate in the case of the gate valve plate with a small open-area ratio. Effects of boundary schemes on computations of acoustic waves generated by vortical flows near a wall. In this paper, direct numerical simulations of the sound from vortex dipole rebound from an adiabatic non-slip wall are performed to investigate the impacts of the boundary schemes combined with the 6 th order compact scheme on the capability of capturing the acoustic waves generated by vortical flows near a wall.

Results show that some boundary schemes make the computations unstable and high order boundary schemes are not always appropriate. However, the vorticity of secondary vortex on the wall computed depends on the each boundary scheme and spatial resolution. This causes large difference in the distributions of vorticity and sound waves.

It is therefore clearly understood that the characteristics of the first derivative of the boundary schemes combined with the 6 th order compact scheme in the high wave number band affect the capability to precisely capture the aerodynamic sound. Special attention to a combination of boundary and compact schemes is required to perform accurate computations of aerodynamic sound generated by flows near a wall.

Experimental observation and numerical analysis of the spin detonation. This paper reports on the behavior of shock triple points on the detonation wave propagating in the rectangular tube, which is obtained from the experimental observation and numerical analysis. Used gas mixtures are the equimolar gas mixture of acetylene and oxygen in the experiment, and the stoichiometric hydrogen and oxygen in the numerical analysis. However, if there are the specific number of shock triple points in the tube, the numerical analysis using finite difference method which is composed of semi-implicit MacCormack TVD scheme can reproduce the propagation behavior obtained by experiment.

Therefore, the propagation mode of detonation is identified by geometry of emission points and emission trajectories of the experimental observation. And then, the detailed propagation mechanism of its detonation which is difficult to observe in the experiment has been revealed. Photo-acoustic measurement and evaluation of thermal resistance of solid contact face. In thermal design of mechanical and electronic equipment with increasing complexity, it is important to estimate thermal contact resistance correctly. In the present study, photo-acoustic method PAM is applied, with the aid of theoretical considerations, to the measurements of thermal contact resistance between solids.

PAM is one of the non-contact and non-destructive methods for detecting thermal properties of various materials. This method is used to extract thermal contact resistance from the data of maximum phase delay of thermal response to periodically modulated irradiation light. For comparisons, steady-state method with constant heat flux is also performed. The results of both methods show the similar tendency and the same order values. Heat transfer enhancement of a channel flow by rotation circular cylinder.

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Heat transfer measurement has been done for a low speed water channel with an insertion of rotation circular cylinder in order to find an effective way to achieve high heat transfer enhancement by dynamic flow control method. In the present study, a ratio of the gap between the cylinder and heat transfer wall to the cylinder diameter was kept to be 0. The diameter based Reynolds number was set for and It was found that the cylinder rotation achieves remarkable heat transfer enhancement.

Counter clockwise rotation, the direction of which accelerates the gap flow, intensifies the unsteady vortex in the shear layer above the low speed area downstream the circular cylinder and this enhances the wall heat transfer over the extensive downstream region. Heat transfer enhancement becomes large as the rotation speed becomes higher within the present experimental condition.

Clockwise rotation suppresses the vortex formation, although high speed rotation induces the fast flow approaching near the wall and achieves large heat transfer enhancement there. Jet breakup behavior with surface solidification. For the safety design of a Sodium-cooled Fast Reactor, it is strongly required that the molten material which is released from a core region has to be solidified and cooled down in a reactor vessel by breaking up in the sodium coolant during a Core Disruptive Accident in terms of Post Accident Heat Removal.

In this paper, in order to investigate the effects of the surface solidification on the jet breakup, the experimental results using a low melting point alloy and water are reported. The jet breakup behavior is observed with a high speed video camera, the front position of the jet and the jet breakup length are estimated with the visual observation results. In the high injection velocity conditions, it is found that the jet breakup is dominated by fragmentation induced by the surface instability due to the relative velocity even in the surface solidification condition.

In addition, it is also found that the tendency of the jet breakup length is close to Epstein's correlation. A rational method to evaluate tornado-borne missile speed in nuclear power plants Validation of a numerical code based on Fujita's tornado model. Explanation is given about a rational method to evaluate tornado-borne missile speed, flight distance and flight height to be used for safety design of a nuclear power plant. In the method, the authors employed Fujita's DBT model as a tornado wind model to take the near-ground tornado wind profile into account.

A liftoff model of an object on the ground was developed by conservatively modeling the lift force due to ground effect. The wind field model and the liftoff model have been compiled together with a conventional flight model into a computer code, named TONBOS.

cailericontjac.ga In this study, especially, the code is verified for one- and two-dimensional free-fall problems as well as a case of Dallas tornado wind field model, whose solutions are theoretically or numerically known. Finally, the code is validated by typical car behaviors characterized by tornado wind speeds of the enhanced Fujita scale, as well as by an actual event where a truck was blown away by a tornado which struck a part of the town of Saroma, Hokkaido in November, Study of condensation on hydrophobic surface with nanoscale hydrophilic regions.


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Water condensation on a hydrophobic surface with nanoscale hydrophilic regions was investigated to reveal the condensation mechanism of submicron-scale droplets. This feature was found on the graphite step-terrace structured surface; step surfaces are more wettable relative to terrace surfaces, and it was precisely characterized using an atomic force microscope. Condensation experiments were conducted using an environmental scanning electron microscope and droplets were observed to line up on preferentially along the graphite steps.