Jin-Hyuk KIM

Jin-Hyuk KIM
Korea Institute of Industrial Technology

Ph.D.
https://sites.google.com/view/jinhyukkim

About

264
Publications
107,778
Reads
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1,721
Citations
Citations since 2017
136 Research Items
1273 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
Additional affiliations
January 2015 - present
University of Science and Technology, Korea
Position
  • Professor (Associate)
December 2013 - present
Korea Institute of Industrial Technology
Position
  • Principal Investigator
August 2013 - November 2013
Kyushu Institute of Technology
Position
  • Fellow

Publications

Publications (264)
Article
Enhancing the hydraulic performance of an axial-flow pump is necessary for increasing the working efficiency and reducing the costs of the pump. In the present study, the impeller and diffuser vane geometry of an axial flow pump are optimized to improve the total efficiency and total head. The internal flow field was obtained by solving the steady-...
Preprint
Full-text available
Inlet flow direction significantly affects the hydraulic performance of an axial-flow pump. Usually, the research papers ignore this phenomenon, resulting in discrepancies between simulation and experimental results. This study examines the influence of inflow direction in five cases (0%, 5%, 10%, 15%, and 30% pre-swirl intensities) to determine th...
Article
Full-text available
The flow in a double-suction twin-volute five-stage centrifugal pump is studied numerically using Computational Fluid Dynamics (CFD) calculations. The pump performance at various flow rates obtained numerically are compared with the theoretically results. The deterioration in pump performance at various flow rates were investigated to find the loss...
Article
The pump–turbine unit used in pumped-storage power generation plays a role in backing up and adjusting the power system in a flexible power generation facility, providing stability in response to renewable energy power grids with intermittent power generation. Owing to changes in the operating conditions of flexible power generation facilities, pum...
Article
Full-text available
Recently, lithium-ion batteries (LIBs) have been widely employed in automobiles, mining operations, space applications, marine vessels and submarines, and defense or military applications. As an anode, commercial carbon or carbon-based materials have some critical issues such as insufficient charge capacity and power density, low working voltage, d...
Article
Full-text available
Vortex rope formation at part load (PL) with cavitation inception causes pressure fluctuations inside the draft tube (DT) of a Francis turbine which may fail the turbine due to resonance and erosion. The pressure surge can be minimized by using anti-swirl fins which ensure safe turbine operation. The present study examines the effect of fin sizes a...
Article
Full-text available
Swirling flow inside draft tube at part load condition during cavitation inception induces large pressure fluctuations. For suppression of the draft tube surge, fins with air injection holes are employed on the draft tube wall. The protrusion of air injection holes obstructs the incoming flow and creates flow complexities near the holes. The presen...
Article
Full-text available
Francis turbine is one of the highly efficient turbines which converts hydraulic energy to mechanical energy. At lower flow rate operating conditions, the turbine’s stable operation is affected due to the downstream swirl instabilities. Cavitation is also a very common and severe problem in these turbines due to which turbine components may fail be...
Article
Full-text available
Lithium-ion batteries (LIBs) are undeniably the most promising system for storing electric energy for both portable and stationary devices. A wide range of materials for anodes is being investigated to mitigate the issues with conventional graphite anodes. Among them, TiO2 has attracted extensive focus as an anode candidate due to its green technol...
Article
Double suction centrifugal pumps find their usage in a variety of applications because of their ability to deliver good performance at higher flowrates and heads. The main issue with these devices is the occurrence of large pressure pulsations which cause noise, vibration, and unstable operation. The present work makes an effort using steady and un...
Article
Full-text available
Undesirable internal flow features under low flow rates in the draft tube of a Francis turbine are caused by the vortex ropes with precession. These vortex ropes cause performance degradation and increase the instability of turbine systems. The effects of anti-swirl fins on the wall of the draft tube were observed in the previous study to suppress...
Article
Full-text available
In this work, an optimized thermodynamic model for the secondary coolant loop of a VVER-1200 reactor-based nuclear power plant is developed. The values of some of the thermo-physical parameters such as coolant flow rate, coolant inlet and outlet temperatures from the steam generator and the turbines, etc. are obtained from the available literature....
Article
Full-text available
Energy storage is an idea that dates back over two thousand years. Engineers, investors, and politicians are increasingly researching energy storage solutions in response to growing concerns about fossil fuels' environmental effects as well as the capacity and reliability of global power systems. Various energy storage technologies are explored in...
Article
In the low-flow rates of off-design conditions in the pump–turbines, complicated flows can develop with vortices in the flow passages, which significantly increase the vibrations and noise, resulting in destabilizing the pump–turbine system. Under low-flow-rate conditions, an appropriate Thoma number is the most essential requirement for stable ope...
Article
Full-text available
A numerical investigation of the mixing performance and fluid flow in a new split and recombine (SAR) Y−Uβ micromixer is presented in this work. A parameter called connecting angle βis varied from 0° to 90° to analyze the effect on the SAR process and mixing performance. Thenumerical data shows that the SAR process strongly depends on the connectin...
Article
Full-text available
Optimal structure of the micromixer with a two-layer serpentine crossing device was accomplished by a multiobjective genetic algorithm and surrogate modeling based on a Navier-Stokes analysis using the trade-off objective functions behavior. e optimization analysis was conducted with three design parameters, i.e., channel width to the pitch span (w...
Conference Paper
Full-text available
전력 계통의 안정 및 주파수 조정을 위한 유연성 제공 역할에 따른 프란시스 수차의 운전환경의 변화로 탈설계 영역 내 운전이 지속되고 있다. 특히, 프란시스 수차의 저유량 영역 운전 시 흡출관(Draft tube) 내 와류의 세차 운동이 유발되며, 압력 맥동 및 진동의 유발로 수차의 성능 저하 및 불안전성의 원인이 된다. 본 연구진의 이전 연구를 통해 세차 와류 억제를 위한 흡출관 내 안티-스월핀(Anti-swirl fins)의 적용에 따른 스월 성분 및 와류 억제 특성이 검토된 바 있다. 하지만, 안티-스월핀의 적용에도 불구하고 흡출관 콘 인근에 세차 와류가 발생하며, 추가적인 와류 억제가 필요하다. 본 연구에서는 프란...
Article
Full-text available
Under low flow-rate conditions, a Francis turbine exhibits precession of a vortex rope with pressure fluctuations in the draft tube. These undesirable flow phenomena can lead to deterioration of the turbine performance as manifested by torque and power output fluctuations. In order to suppress the rope with precession and a swirl component in the t...
Article
Full-text available
The demand for computational fluid dynamics (CFD)-based numerical techniques is increasing rapidly with the development of the computing power system [...]
Article
Full-text available
Undesirable pressure fluctuations in Francis turbines are caused by precession of the vortex rope in the draft tube under conditions of low flow rate. These pressure fluctuations can cause a resonance that seriously undermines the stability of the turbine system. In the previous study, the effects of anti-swirl fins in the draft tube were investiga...
Article
Full-text available
A multistage centrifugal pump was developed for high head and high flow rate applications. A double-suction impeller and a twin-volute were installed at the first stage followed by an impeller, diffuser and return vanes for the next four stages. An initial design feasibility study was conducted using three-dimensional computational fluid dynamics t...
Article
Unusual flow characteristics such as reverse flow, rotating stalls, flow recirculation, and stationary vortexes can induce high dynamic forces and torque variations on the entire system, creating a positive slope in the discharge-head curve. To avoid these problems, the present study investigates the hydrodynamic characteristics of a lab-scale mode...
Article
Positive displacement hydraulic turbine (PDT) is a new class of turbine, capable of effectively generating micro and Pico hydro power for low specific speed applications. This type of turbine is not very popular and hence, it is interesting to research on it. With the rising concerns of environmental pollution, climate change and global warming, em...
Article
Full-text available
A multistage centrifugal pump is designed for pumping low-viscosity, highly volatile and flammable chemicals, including hydrocarbons, for high head requirements. The five-stage centrifugal pump consists of a double-suction impeller at the first stage followed by a twin volute. The impellers for stages two through five are single-suction impellers f...
Article
Full-text available
S-shaped characteristics in turbine mode are prone to instabilities in associated transient processes. A single value of the speed factor corresponds to multiple values of the discharge factor, having the possibility of changing the operating point among the turbine, turbine brake, and reverse pump modes. Because of this characteristic, the S-shape...
Conference Paper
Full-text available
프란시스 수차의 흡출관 내 와류의 세차운동은 저유량 영역 운전 시 유발되며, 이에 따라 압력 맥동이 발생한다. 이러한 압력 맥동은 수차 시스템의 고유 주파수와 공진을 일으키는 경우 출력 맥동으로 인한 수차의 성능 저하, 진동 및 소음 유발로 인한 수차 운전 불안정성의 원인이 된다. 이와 같은 흡출관 내 유동 불안정성을 억제하기 위해 흡출관 내 안티-스월핀(Anti-swirl fins)을 적용을 통한 유동의 스월 성분의 감소 및 와류 발생의 억제에 대한 특성 검토를 본 저자들로부터 기 수행된 바 있다. 하지만, 흡출관 콘 인근에 안티-스월핀의 장착에도 남아있는 와류의 세차운동을 러너 콘에서의 공기 주입을 통한 와류 억제...
Article
Seafood, especially sea cucumbers and oysters are an expensive delicacy in several Asian countries. Traditional sun-drying of these products takes 3 to 4 days and fetches a lower market price. Modern industrial drying machines used for seafood drying are unable to dry sea cucumbers and oysters without texture and color degradation as they are delic...
Article
Full-text available
This paper deals with three-objective optimization, using machine-learning-based surrogate modeling to improve the hydraulic performances of a two-vane pump for wastewater treatment. For analyzing the internal flow field in the pump, steady Reynolds-averaged Navier-Stokes equations were solved with the shear stress transport turbulence model as a t...
Article
For applications involving very low specific speeds resulting from very low flow rates with medium to high heads, a special class of hydraulic turbine known as Positive displacement turbine (PDT) is most suited. These turbines are not very common, but they can effectively harness the micro and Pico hydropower. For the present work, the effect of in...
Book
국내에 소개된 여러 터보기계 관련 서적을 검토하면서 유체역학적인 기본 이론과 설계, 산업 현장에 적합한 기계의 선정 등을 폭넓게 다루는 교재를 선정하려고 노력하던 중에 Wright 박사와 Gerhart 박사가 저술한 서적을 접하게 되었다. 본 교재에서는 상사 법칙부터 터보기계의 기본 이론, 소음, 2차원 및 3차원 유동에 이르는 광범위하지만, 터보기계를 처음 접하는 학생이나 공학자가 기본적으로 알아야 하는 내용들을 다루고 있다. 본 교재의 가장 큰 특징은 터보기계 관련 이론의 소개와 유도뿐만 아니라 이 이론들을 실제 산업에 적용하는 방법을 설명하고 있다는 것이다. 그 예를 들면, 대표적인 산업용 터보기계인 홴과 펌프에...
Conference Paper
Full-text available
프란시스 수차의 저유량 영역 운전 시 흡출관 내 와류의 세차운동이 발생하며 압력 맥동을 유발한다. 유발된 압력 맥동이 수차 시스템과 공진을 일으키는 경우, 토크와 출력에 맥동을 유발시켜 수차의 성능을 저하시킬 뿐 만 아니라 진동 및 소음이 발생되어 시스템의 운전을 불안정하게 한다. 한편, 이러한 흡출관 내 와류와 같은 비정상 유동패턴을 억제하기 위해, 흡출관 내 홈 및 구조물 등의 설치와 공기 또는 물을 주입해 왔다. 본 연구에서는 프란시스 수차 모델의 흡출관 내 발생하는 와류 억제에 대한 연구의 일환으로, 흡출관 내 안티 캐비티 핀에 따른 와류의 특성에 대해 비정상 상태 수치해석을 수행하여, 비정상 내부 유동 및 압력...
Poster
Full-text available
한국생산기술연구원은 정부출연연구기관으로 산업계, 그 중에서도 특히 중소·중견기업 지원을 목적으로 1989년 설립되어, 산업원천기술개발 및 실용화 지원을 통해 글로벌 중소·중견기업을 육성하고 국가 산업 발전을 선도하고 있다. 이러한 연구원의 설립 취지에 따라 3대 중점 연구소체제와 더불어 생산현장 가까운 곳에서 밀착 지원을 위해 7개의 지역본부를 설치·운영하고 있다. 3대 연구소 중 하나인 청정기술연구소에서는 글로벌 환경 변화에 대응하고 지속 가능한 성장을 이루기 위해 IoT와 빅데이터를 활용한 스마트화, 에너지 낭비를 최소화하는 설비 중심의 에너지 고효율화, 폐자원을 활용한 산업용 소재 생산 등 청정기술을 개발하여 국내...
Article
In this work, a preliminary design of an inlet guide vane and runner for developing a 2.5 kW hydraulic turbine was conducted by using computational fluid dynamic analysis. Three-dimensional Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence model were used to analyze the fluid flow in the hydraulic turbine. The hexahed...
Article
Full-text available
In this work, a preliminary design of an inlet guide vane and runner for developing a 2.5 kW hydraulic turbine was conducted by using computational fluid dynamic analysis. Three-dimensional Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence model were used to analyze the fluid flow in the hydraulic turbine. The hexahed...
Article
The tip leakage cavitation phenomenon observed in axial-flow type turbines is one of the major causes of blade tip erosion. This study is focused on the Kaplan turbine cavitation occurring at the tip clearance gap between the blade tip and the stationary shroud casing. An unsteady multi-phase cavitation numerical model is studied on a three-dimensi...
Article
Full-text available
In the Francis turbine, the leakage flow through the runner gaps which are between the runner and the stator structure influences the internal flow and hydraulic performance. Thus, the investigation for the flow characteristics induced by the runner gaps is important. However, the runner gaps are often disregarded by considering the time and cost o...
Article
Full-text available
Undesirable flow phenomena in Francis turbines are caused by pressure fluctuations induced under conditions of low flow rate; the resulting vortex ropes with precession in the draft tube (DT) can degrade performance and increase the instability of turbine operations. To suppress these DT flow instabilities, flow deflectors, grooves, or other struct...
Article
Full-text available
In this study, the shape of a mixed-flow pump impeller and its flow characteristics as a function of the specific speed are studied to improve its suction performance and efficiency. The shapes of mixed-flow pump impellers show a trend based on the specific speed. To construct the optimum database, a mixed-flow pump impeller with a specified specif...
Article
This study used a laboratory-scale prototype of a hybrid heat pump vacuum dryer to investigate its effect on the drying rate of seafood products. Although seafood products such as oysters and sea cucumbers are the target products, the initial experiments were carried out using wet sponges with the same moisture content as the oysters. The experimen...
Article
Positive Displacement hydro turbine (PDT) is a special class of hydraulic turbine which can be useful in recovering micro and Pico hydro power from conventional as well as unconventional resources. This class of turbine is very uncommon and most effective in low specific speed applications. Flow leakage through the clearance gaps plays a vital role...
Article
Full-text available
In the numerical studies, it is very important to accurately reflect the analyzing physical model, and usually the grid dependency tests are used to perform accurate numerical analysis by comparing the composition and size of the numerical grids. However, there is no obvious criterion for generating the composition and size of the grids in the grid...
Article
The importance of renewable energy will increase rapidly due to the global regulation of carbon dioxide emissions to cope with global warming. However, renewable energy has a high output variation because of the fluctuating characteristics of the energy source. Therefore, pumped-storage power stations require high flexibility and reliability in ope...
Chapter
https://books.google.co.kr/books?hl=en&lr=lang_en&id=ulfSDwAAQBAJ&oi=fnd&pg=PA260&ots=vAigUGBJiS&sig=5rMhNqazlkl6lblDVm98D13kYGk&redir_esc=y#v=onepage&q&f=false
Article
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Pump-turbines are often used to provide a stable power supply with a constant frequency in response to intermittent renewable energy resources. However, existing pumped-storage power stations often operate under off-design conditions because of the increasing amounts of inconsistent renewable resources that have been added to the grid. Under off-de...
Article
Full-text available
In this article, design optimization was carried out to improve the suction performance and efficiency of a mixed-flow pump impeller. Commercial computational fluid dynamics code and a response surface method were used in the optimization to design a mixed-flow pump impeller. When it comes to a mixed-flow pump, the two main research objectives name...
Article
Francis turbines are often used for generating hydroelectric power, but their performance characteristics significantly depend on the operating conditions. In particular, inter-blade vortices in the passages between runner blades can occur at low flow rates, which can degrade performance, and increase vibrations and instability during operation. In...
Article
Renewable energy will play an important role in achieving the energy stability and reducing the dependence on fossil fuels. Hydropower is one of the cheapest and reliable sources of renewable energy. The potential of micro and Pico hydro power is not yet fully explored. They can prove to be decisive in generating clean energy from conventional and...
Article
Full-text available
This paper handles a hybrid multiple optimization technique to concurrently enhance hydraulic efficiency and decrease unsteady radial forces resulting from fluid-induced vibration of a single-channel pump for wastewater treatment. A single-channel impeller and volute was optimized systematically by using a hybrid particle swarm optimization and gen...
Article
Full-text available
The precessional vortex is usually developed in the draft tube during the operations at the turbine mode of a pump turbine with low flow-rate conditions as the off-design conditions. This vortex causes pressure fluctuation and instability for the operation of the pump turbine system, which results in system failure. The development of the precessio...