Applied Mechanics and Materials Vols. 752-753

Abstract: The Korea Atomic Energy Research Institutes has been developing the SMART (System integrated Modular Advanced ReacTor), an environment-friendly nuclear reactor, for the generation of electricity, and to perform desalination. SMART reactors can be exposed to various external and internal loads caused by seismic and coolant flows. Reactor structures need to be maintained for the reactor’s safety and integrity against these loads during the operational time of the SMART. This paper presents two FE-models, 3-D solid models of the reactor internals in the air and in the coolant, and then compares the results of the dynamic characteristic for the two FE-models using a commercial Finite Element tool, ANSYS V12. A solver was selected by the Block Lanczos method. These FE-models are looking forward to being executed in various researches concerning the SMART in further studies.

Abstract: In order to improve the reliability and stability of the automobile suspension system, the important parts of automobile suspension control arm is studied. Reverse engineering technology is applied to reverse modeling according to the characteristics of complicated suspension control arm shape. At the same time, the automobile suspension control arm is analyzed under load condition to ensure that the automobile suspension control arm is safe in the process of driving. The control arm meshing and strength analysis are completed by ANSYS analysis software. Finally, ANSYS fatigue analysis module is used to verify that the automobile suspension control arm can meet the requirement of fatigue strength.

Abstract: This paper examines technological and operational aspects that influence the selection of manufacturing process structure for integrated bladed rotors. On one hand the choice of rough manufacturing process technologies is highly important as it determines the main portion of the cycle time and as a result greatly affects the overall unit cost. On the other hand the finishing processes greatly influences the operational parameters of the blisk in service as the final geometry, surface roughness and boundary layer properties are formed at this stage. This research provides ways to build a solid framework for selecting optimal technologies and tools at each stage of blisk manufacturing based on a set of key parameters that include geometric requirements specified by the drawings, properties of the stock material, production volume and operational requirements.

Abstract: The article presents the results of research of the hydrothermal destruction technology of organic fuel materials for the production of steam-flue gas mixture for thermal engines.

Abstract: The method of selective laser melting (further SLM) has big prospects from the point of view of achievement of a difficult form of details with high precision and quality of a surface, however SLM has also a number of technological restrictions from the point of view of achievement of a difficult form of details. In this work technological capabilities of production of figurine details from a heat resisting cobalt alloy are investigated by method of selective laser melting, technological restrictions of a method and way of their overcoming are shown.

Abstract: The article presents the results of experimental investigations of rotor wheels supersonic microturbines with a large angle of rotation of the flow. The characteristics of the studied rotor wheels. The analysis of the results of the study ratio speed of rotor wheels, depending on the Mach number. Recommendations for the design working wheels microturbines operating at high supersonic gas flow rates.

Abstract: We focus on an m-machine re-entrant flowshop scheduling problem with the objective of minimizing total tardiness. In the re-entrant flowshop considered here, routes of all jobs are identical as in ordinary flowshops, but the jobs must be processed multiple times on the machines. We present heuristic algorithms, which are modified from well-known existing algorithms for the general m-machine flowshop problem or newly developed in this paper. For evaluation of the performance of the algorithms, computational experiments are performed on randomly generated test problems and results are reported.

Abstract: The article is focused on experimental investigation of oil dynamics in long pipe at non-stationary flow. The non-stationary flow is realized by sudden closing of seat valve at the end of the long pipe. For this reason the oil pressure is suddenly increased and hydraulic shock is created. There is described the influence of oil flow velocity on hydraulic shock in this article. The pressure is measured near the seat valve. Furthermore this process is mathematically simulated using Matlab SimHydraulics software and is compared with the experiment.

Abstract: In general, the turbulent flow inside PWR (Pressurized Water Reactor) fuel assembly depends on the mixing vane configuration and the pattern of the mixing vane arrangement on the strap of the spacer grid. In this study, in order to examine the turbulent flow structure inside fuel assembly with the split-type mixing vanes, simulations were conducted with the commercial CFD (Computational Fluid Dynamics) software, ANSYS CFX R.14. Two different types of turbulence models, i.e. SAS (Scale-Adaptive Simulation)-SST (Shear Stress Transport) and DES (Detached Eddy Simulation), were used. The predicted results were compared with the measured data from the MATiS-H (Measurement and Analysis of Turbulent Mixing in Subchannels-Horizontal) test facility. Although there were locally differences between the prediction and the measurement, ANSYS CFX R.14 predicted the time averaged velocity field in the reliable level. The predicted horizontal and vertical velocity components were more in agreement with the measured data than the axial velocity component. There was no significant difference in the prediction accuracy of both turbulence models.

Abstract: Baffles are frequently used to reduce flow speed and to change fluid passages by directly blocking oncoming flow. This study employed multi-stacked porous baffle obstructions to enhance the flow relaxations of water-soluble buoyant gases inside an odor removing basin system. We performed qualitative flow visualization by using tracing particles in working fluid to evaluate the effects of porous baffles. Particle image velocimetry technique was also employed to quantitatively analyze the flow field around the baffle regime. As a result, oncoming two-phase bubbly flow from the basin bottom regime was bent, passing the edge of a porous baffle plate. The main stream speed and momentum were effectively reduced by the installed porous flow obstruction devices.