The flat-hull ship design is an innovative concept that saves costs and speed-up the fabrication of ship. Even though was hydrodynamically inefficient, some shipowners probably experienced issue with its unusual shape disadvantages where drag greater than conventional ships. This paper aimed to improve a vessel using hull vane bow foil reduce resistance. asymmetric NACA 4412 0012 were used for ...

This study reconstructed the flow field of a symmetrical variable inlet guide vane in centrifugal compressor through passive control method slots. Based on high-fidelity numerical simulation model verified by experiments, influence different slot forms was investigated, and mechanism revealed. The results demonstrated that can effectively suppress suction surface separation broaden range low-lo...

In the process of milling profile vanes a gas turbine engine on multi-operational machines, technological scheme transverse line shaping is used. According to this scheme, vane rotates around its own axis, it machined with mill spherical working surface, which performs rotation and interpolated axial movement. The required parameters surface quality airfoil (profile accuracy roughness parameter...

In Japan, the refrigerant used in room air-conditioners has been changed from HCFC-22 (R-22) to R-410A, a blend of HFC-32 and HFC-125 (50/50 vt%), in order to protect the ozone layer. Generally, the miscibility between the refrigerant and refrigeration oil must be assured, because the oil needs to return to the compressor from the refrigeration cycle and lubricate the sliding parts. Alternative...

In this work a response surface approach was used for predicting the hill chart of a small horizontal shaft Kaplan turbine. To this aim, artificial neural networks (ANN) were chosen as a fast, reliable, and computationally inexpensive tool. The training of the ANN was based on computational fluid dynamics (CFD). The optimization of the runner-guide vane stagger correlation is a time consuming a...

in this century due to population growth, the use of river water has become more complicated. since most rivers pass across loose and erodible areas, they always act as the most important factor of transferring eroded materials from the solid crust of the earth.  vortex basins are among the solutions known for the high-speed separation of solids from liquids (filtration). one of the problems of...

Abstract In this paper, the results of analysis forces acting on vanes in a double-acting vane pump with an integrated electric drive have been presented. new motor unit, is assembled inside rotor motor. A dynamic model representing movement has developed considering impact pressure load distribution, support and friction forces. The loss contact between head cam ring lead to noise reduction vo...