Kim D.S.,Hyosung Goodsprings Inc. |
Mamatov S.,Hyosung Goodsprings Inc. |
Park W.G.,Pusan National University
Transactions of the Korean Society of Mechanical Engineers, B | Year: 2016
In this study, a high-pressure multistage pump used in the combined cycle power plants is analyzed. The pump performance characteristics (differential head and efficiency) are numerically analyzed for different shapes of the radial diffuser. The design variables selected for the radial diffuser are, number of vanes, diameter ratio (D4/D3), return channel outlet angle(α6), and pressure recovery factor (Cp). The numerical analysis results showed that the differential head and efficiency are the highest when the diameter ratio is the highest. Further, it was observed that the differential head was lower when the return channel outlet angle was 60° than when it was 90°, because of pre-swirl at the diffuser outlet. © 2016 The Korean Society of Mechanical Engineers.
Kim Y.,Korea Institute of Construction Technology |
Kang M.G.,Hyosung Goodsprings Inc. |
Lee S.,Kookmin University |
Jeon S.G.,Hyosung Goodsprings Inc. |
Choi J.-S.,Korea Institute of Construction Technology
Desalination and Water Treatment | Year: 2013
Of paramount importance, seawater desalination plants using reverse osmosis (RO) is reducing the use of energy, which is mostly required for high pressure pumps. Accordingly, energy recovery devices (ERDs) are widely used for reusing hydraulic energy in RO concentrate stream. Nevertheless, few works have been done to investigate the operation characteristics of various EDR systems in actual desalination plants. In this context, we focused on the comparison of ERDs in a pilot plant with the capacity of 1,000m3/day. One centrifugal ERD (turbocharger) and two different types of isobaric ERDs (pressure exchanger [PX] and pressure exchanger for energy recovery [PEER]) were installed and tested under various conditions. Operation data in the pilot plant were analyzed to estimate specific energy consumption and energy transfer efficiency. The specific energy consumption analysis results showed that the isobaric ERDs have higher efficiency than the centrifugal ERD as also expected in theoretical estimation. The energy transfer efficiencies for PX and PEER were determined to be similar in short-term tests. © 2013 Desalination Publications.
An Y.S.,Gyeongsang National University |
Gu D.S.,Hyosung Goodsprings Inc. |
Lee J.M.,Gyeongsang National University |
Ha J.M.,Gyeongsang National University |
And 4 more authors.
Journal of Mechanical Science and Technology | Year: 2014
The application of the high-frequency acoustic-emission (AE) technique in the condition monitoring of rotating machinery has been increasing of late. It has a major drawback, though, the attenuation of the signal, and as such, the AE sensor has to be close to its source. Two signal-processing methods, envelope analysis and wavelet transform, were found to be useful for detecting faults in the rolling element bearing and gearboxes. These methods have a disadvantage, though: their application is focused only on a component of the assembled machine. For example, envelope analysis is a powerful method for detecting faults in the bearing system, but it is not proper for use in the gear system. Thus, these methods could not be used to detect combined faults in the common assembled machines. Therefore, we propose a signal-processing method consisting of envelope analysis and DWT (discrete wavelet transform). In addition, a novel mother function optimized for the AE signal for DWT was extracted through a fatigue crack growth test, and is also proposed herein. Then the proposed method, called intensified envelope analysis (IEA), was used to detect the faults in the rolling element bearing and rotating shaft. According to the results, IEA can be a better signal processing method for the condition monitoring system using AE technique. © 2014, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.
Lee H.-C.,Hanyang University |
Lee H.-C.,Korea Institute of Industrial Technology |
Kim J.-H.,Hanyang University |
Kim J.-H.,Korea Institute of Industrial Technology |
And 5 more authors.
IET Conference Publications | Year: 2014
This paper presents a procedure for design optimization of a Multiphase pump used for offshore plants. The Multiphase pump consists of a Helico-Axial type impeller with three blades and diffuser with eleven vanes. Variables and ranges defining blade angles of impeller and diffuser were selected as design variables for influences evaluation by using 2K factorial method. Based on the selected variables, the optimum model for the efficiency of multiphase pump was derived by using the response surface approximation (RSA) model.
Kim J.J.,Hyosung Goodsprings Inc. |
Yoon H.,Hyosung Goodsprings Inc. |
Hong J.,Hyosung Goodsprings Inc. |
Lee T.,Hyosung Goodsprings Inc. |
Wilf M.,Private Consultant
Desalination | Year: 2013
Hyosung Goodsprings has embarked on development of new seawater reverse osmosis (SWRO) desalination technologies through construction and operation of SWRO research facility with 2000m3/day production capacity.The pilot plant includes a new compact pretreatment system to treat high turbidity seawater. The pretreatment system includes double stage stretching-releasing type fiber filter (FF) followed by ultrafiltration unit. This configuration shows successes in producing consistent quality of feed water to RO membrane of less than 3 SDI15 even during periods of high turbidity seawater reaching levels of 52NTU. The FF pretreatment has very small foot print and competitive operation cost in terms of chemical and energy consumption. However, the main concern of stretching-releasing type fiber filter is physical integrity of the fibers over the equipment lifetime. Field results for two years operation show that fiber bundles made of polypropylene break frequently and need to be replaced with new bundles annually. Improvement of durability of fiber material and filter equipments is necessary for application of FF in commercial desalination plants.The stable operation of RO unit provides support to the above conclusion that limited size pretreatment process evaluated in this study could be adequate for membrane desalination system treating high turbidity seawater. © 2012 Elsevier B.V.
Watanabe S.,Kyushu University |
Uchinono Y.,Kyushu University |
Ishizaka K.,Kyushu University |
Furukawa A.,Oita National College of Technology |
Kim J.-H.,Hyosung Goodsprings Inc.
Journal of Thermal Science | Year: 2013
It has been found in our past studies that the installation of asymmetric plate at the inlet of inducer is effective for the suppression of cavitation surge phenomenon. In the present study, the suction performance of 2-bladed helical inducer with an inlet asymmetric plate is experimentally investigated. It is observed that the suction performance in large flow rate conditions is not significantly influenced by the asymmetric plate, whereas the head of inducer with the asymmetric plate increases just before the head breakdown in partial flow conditions. To understand the mechanism of this additional head, the flow measurements and the numerical simulations are carried out. It is found that the circumferential component of absolute velocity at the exit of inducer slightly increases with the development of cavitation in both cases with and without the inlet asymmetric plate, indicating the increase of the theoretical head. The theoretical head increase with the inlet asymmetric plate is also confirmed by the unsteady numerical simulations, suggesting that the additional head is achieved through the increase of the theoretical head with the change of the exiting flow from the inducer associated with some amount of cavitation. © 2013 Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg.
Kang W.-T.,Changwon National University |
Yu K.H.,Hyosung Goodsprings Inc. |
Lee S.Y.,Hyosung Goodsprings Inc. |
Shin B.R.,Changwon National University
ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011 | Year: 2011
A numerical and an experimental investigation on a suction vortices including cavitation, free vortices and subsurface vortices behavior in the model sump system with multi-intakes is performed at several flow rates and water levels. A test model sump and piping system were designed based on Froude similitude for the prototype of the recommended structure layout by HI-9.8 American National Standard for Pump Intake Design of the Hydraulic Institute. An experiment is performed according to the sump model test procedure of Hyosung Goodsprings, Inc. A numerical analysis of three dimensional multiphase flows through the model sump is performed by using the finite volume method of the CFX code with multi-block structured grid systems. A k-ω Shear Stress Transport turbulence model and the Rayleigh-Plesset cavitation model are used for solving turbulence cavitating flow. Several types of free surface and submerged vortex which occurs with each different water level are identified through the experimental investigation. From the numerical analysis, the vortices are reproduced and their formation, growing, shedding and detailed vortex structures are investigated. To reduce abnormal vortices, an anti-vortex device is considered and its effect is investigated and discussed. Copyright © 2011 by ASME.
Hyosung Goodsprings Inc. | Date: 2011-10-25
A flow path switching valve includes a tube body including one or more inlets opened to communicate with a fluid supplying source and supplying fluid into an inside of the tube body, outlets opened at opposite sides to the respective inlets and selectively alternately discharging fluid from the inside of the tube body, drains opened at opposite ends and discharging operating fluid introduced through the outlet, and seat units respectively protrude on an inner circumference of the tube body between the inlet(s), outlets and drains. An operating rod, coaxially mounted in the tube body, includes spaced apart projection units and is connected to an operating unit at one end so as to reciprocate axially within the tube body responsive to the operating unit. Valve bodies are movably disposed on an outer circumference of the operating rod and are arranged between the respective projection units to face respective seat units.
Hyosung Goodsprings Inc. | Date: 2012-03-06
power operated blowers; air compressors; pumps as parts of machines, engines and motors; air pumps; pneumatic pumps; compressed air pumps; reciprocating pumps; centrifugal pumps; vacuum pumps; diffusion pumps; rotary pumps; motors other than for land vehicles; hydraulic turbines.
Song A.H.,Hyosung Goodsprings Inc. |
Song J.D.,Hyosung Goodsprings Inc. |
Kim H.S.,Hyosung Goodsprings Inc. |
Jung G.C.,Hyosung Goodsprings Inc.
IOP Conference Series: Earth and Environmental Science | Year: 2012
BFPs(Boiler Feedwater Pump) in power plants are used for pumping high pressure and high temperature water. The pressure pulsation of high pressure pumps is the vibration caused by fluid forces. If the frequency of the exciting source is adjacent to one of the natural frequencies of the pump, it can cause high vibration by resonance. The natural vibration characteristics of pump depend on thermal variation. This paper examines vibration characteristics due to thermal variation experimentally and analytically. © Published under licence by IOP Publishing Ltd.