- TITLE:
MODELING THE AERODYNAMICS OF THE BLADES OF ENERGY STEAM TURBINES
- AUTHOR(S):
V. Aftaniuk, B. Garagula, A. Kiris, V. Spinov
- ABSTRACT:
In this paper, a research was conducted of experimental studies for real blades and CFD
modeling of the blades of low pressure steam turbines. To model CFD, developed by solid-state
models of blades of a special design are used (with a “back” profile curved against the flow and a
thickened outlet edge). The CFD model includes a package of three blades which are similar real
blades. Studies are conducted for three gas inlet angles 26, 41, 61. An analysis of the
experimental data and the results of CFD modeling of gas flow shows that gratings of a special
design have small energy losses at high supersonic speeds. In terms of efficiency, these gratings are
superior to traditional gratings by providing continuous flow by large Mach numbers. The use of
special grids is rational in the case of turbine operation under variable operating conditions. The
developed CFD model can be used as an element in larger models of energy steam turbines.
- PAGES:
54-
- DOWNLOAD:
MODELING THE AERODYNAMICS OF THE BLADES OF ENERGY STEAM TURBINES
- TITLE:
EXPERIMENTAL STUDY OF A HYDROGEN GENERATOR WITH APPLICATION MODULES OF ULTRASONIC CAVITATION AND VIBRATION OSCILLATIONS
- AUTHOR(S):
Ihor Nochnichenko, Oleksandr Luhovskyi, Dmytro Kostiuk
- ABSTRACT:
In the article the increase in the efficiency of HHO gas generation is considered due to the
application of the phenomenon of ultrasonic cavitation and the module of vibration oscillations, the
intensity of which exceeds the threshold of cavitation occurrence. A bench was developed for
studying the efficiency of the hydrogen generator with an ultrasonic cavitation block to accelerate
the separation of gas bubbles from the surface of electrodes. The efficiency of this method is
confirmed. An increase in the amount of isolated gas during the application of the phenomenon of
ultrasonic cavitation and vibrational influence is obtained.
- PAGES:
50-
- DOWNLOAD:
EXPERIMENTAL STUDY OF A HYDROGEN GENERATOR WITH APPLICATION MODULES OF ULTRASONIC CAVITATION AND VIBRATION OSCILLATIONS
- TITLE:
INVESTIGATION SURFACE MORPHOLOGY OF CP TI AND TI6AL4V ALLOY TREATED WITH PICOSECONDLASER
- AUTHOR(S):
Tsanka Dikova, Sergei A. Kulinich, Satoru Iwamori, Kazuyoku Tei, Shigeru Yamaguchi
- ABSTRACT:
The aim of the present paper is to investigate the morphology of titanium surfaces treated with
picosecond laser. Round samples of cpTi Gr-2 and Ti6Al4V alloy were treated by a commercial
picosecond laser. Two variables were used: average power (1W, 0.5W, 0.2W) and pulse number
(1,000-20,000). The samples were investigated by OM, SEM, EDX and non-contact 3D surface
profilometer. It was found that the topography of the laser-treated surfaces of both cpTi Gr-2 and
Ti6Al4V alloy was similar. It is characterized with micron-scale periodical structures in radial
direction, appearance of cavities, submicron-scale periodical structures in the former grains along
the periphery of ablated craters (in low energy regimes) and splashed material and debris along the
boundaries of the cavities (in higher energy regimes). The depth of the cavities in cpTi Gr-2 treated
with the lowest regime parameters was lower than that of Ti6Al4V alloy (0.4 and 5.5 μm,
respectively). In cpTi Gr-2, the cavity depth increased mostly with increase in the pulse number while
for Ti6Al4V alloy it increased with increasein laser power. The surface of the zone of laser influence
and walls of the cavities were covered with layers of different titanium oxides in cp Ti-Gr-2 and with
mixed oxides of Ti and Al in the case of Ti6Al4V alloy. The oxides along the cavities walls were
characterized with layered morphology, which is finer in Ti6Al4V alloy. The results of this study can
be used when applying picosecond pulsed lasers for texturing titanium surfaces to improve their
medico-biological properties.
- PAGES:
5-
- DOWNLOAD:
INVESTIGATION SURFACE MORPHOLOGY OF CP TI AND TI6AL4V ALLOY TREATED WITH PICOSECONDLASER
- TITLE:
MEASUREMENT OF THE REFLECTION COEFFICIENT OF MOIST MATERIALS AT ULTRAHIGH FREQUENCIES
- AUTHOR(S):
Konstantyn Shevchenko, Oleksiy Yanenko, Mikhail Prokofiev, Sergey Peregudov, Vasyl Kuz, Stanislav Us
- ABSTRACT:
The paper considers the possibility of increasing the accuracy of the measurement of the
reflection coefficient of moist materials in the region of ultrahigh frequencies. By the magnitude of
the reflection coefficient, the moisture content of the material is uniquely determined. The solutions
proposed by the authors allow adaptively to monitor the minimum value of the reflection coefficient
and to intensify the processes of heat treatment of moist materials.
- PAGES:
46-
- DOWNLOAD:
MEASUREMENT OF THE REFLECTION COEFFICIENT OF MOIST MATERIALS AT ULTRAHIGH FREQUENCIES
- TITLE:
COMPUTER-AIDED ENGINEERING (CAE) APPROACH IN THE BENDING ANALYSIS OF A COMPOSITE BEAM
- AUTHOR(S):
Fatih Karacam, FerudunDoğuş Yilmaz
- ABSTRACT:
Bending analysis of a symmetric cross-ply beam subjected to a uniform distributed load with
different boundary conditions is performed by utilizing finite element method through a computer
aided engineering (CAE) software. In this study, 3-D modelling with brick elements is used in order
to have an alternative reference solution, although modelling with conventional and continuum shell
elements are appropriate choices for composite structures. The longitudinal and vertical in-plane
displacements, shear and normal stresses are examined at different points and sections of the beam.
The results are compared with the analytical and computational solutions available in the literature,
and the in-plane displacement and bending stress distributions are illustrated for various boundary
conditions.
- PAGES:
41-
- DOWNLOAD:
COMPUTER-AIDED ENGINEERING (CAE) APPROACH IN THE BENDING ANALYSIS OF A COMPOSITE BEAM
