• International Journal of Naval Architecture and Ocean Engineering
• /
• 제8권1호
• /
• pp.73-82
• /
• 2016

In order to extend the operational life of Underwater Moored Platforms (UMPs), a horizontal axis water turbine is designed to supply energy for the UMPs. The turbine, equipped with controllable blades, can be opened to generate power and charge the UMPs in moored state. Three-dimensional Computational Fluid Dynamics (CFD) simulations are performed to study the characteristics of power, thrust and the wake of the turbine. Particularly, the effect of the installation position of the turbine is considered. Simulations are based on the Reynolds Averaged Navier-Stokes (RANS) equations and the shear stress transport ${\kappa}-{\omega}$ turbulent model is utilized. The numerical method is validated using existing experimental data. The simulation results show that this turbine has a maximum power coefficient of 0.327 when the turbine is installed near the tail of the UMP. The flow structure near the blade and in the wake are also discussed.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2004년도 추계학술대회논문집
• /
• pp.641-646
• /
• 2004

Noise and vibration was encountered in exhaust duct system which is connected with a gas turbine and a heat recovery steam generator(HRSG) of a cogeneration power plants. Especially, these problems occurred when water was added to the fuel injection to reduce NOx contents of the exhaust gas. Through the cavity mode analysis and measurements, It was concluded that these problems occurred due to the acoustic resonance between the duct cavity mode and the excitation force induced by turbulent gas flow during water injection. To reduce the noise and vibration, optimal baffle plate to change the cavity mode was installed inside of duct and noise levels of about 8 dB(A) are reduced in duct system. The effects of baffle plate and guide vane to the HRSG or inlet duct vibration were also evaluated and it was verified that there is no relation to the resonance phenomena. So, vibration of inlet duct was easily reduced by the reinforcement of structures.

• 대한기계학회논문집B
• /
• 제41권8호
• /
• pp.537-544
• /
• 2017

본 연구의 목적은 수분회수 냉각탑에 설치된 엇갈림(staggered) 형태로 배치된 중공사막 모듈을 다공성 매질(porous medium)로 모델링 시 유동특성을 수치 해석적으로 검토하는 것이다. 1단으로 설치된 중공사막 모듈의 차압 데이터를 이용하여 다공성 매질의 모델링을 위한 압력-속도 2차 식을 도출하였다. 중공사막 모듈을 다공성 매질로 모델링한 경우 ("다공성 매질")와 중공사막 모듈의 형상을 그대로 고려한 경우 ("멤브레인 모듈")에 대해 유동 특성을 비교하였다. "다공성 매질"의 경우 "멤브레인 모듈"에 비해 유동에 의한 압력 변화는 0.6 % 미만의 적은 차이를 나타냈으나, 최대 유속은 약 2.5배, 평균 난류 운동에너지는 95배로 크게 나타났다. 이를 통해 다공성 매질로의 모델링은 압력강하는 잘 구현하나, 유속 및 난류 운동에너지는 잘 모사하지 못함을 알 수 있었다.

• 대한기계학회논문집B
• /
• 제40권12호
• /
• pp.815-824
• /
• 2016

가압경수로에 장전되는 핵연료집합체는 연료 봉 다발과 지지격자 및 상하단 고정체로 구성되어 있다. 고온 고압의 냉각수는 원자로 하부로 유입되어 연료 봉 사이로 형성된 부수로를 따라 노심 상부로 흐른다. 경수로핵연료의 주요 열수력 성능인자는 정상운전시 압력강하 및 임계열속이며 사고시에는 급랭 시간이다. 한국원자력연구원에서는 경수로핵연료의 성능을 향상시키고 국산화를 위해 고성능 경수로핵연료, 이중냉각 핵연료 및 사고저항성 핵연료를 개발하였다. 경수로핵연료의 열수력 핵심기술을 개발하기 위해 압력강하 실험, 난류 유동혼합/열전달 실험, 임계열속 및 급랭 시험을 수행하였으며 전산유체역학 방법도 활용하였다. 더불어 사용후핵연료의 임시저장을 위한 건식저장 용기의 열유동에 대한 전산유체해석을 수행하였다. 한편, 경수로핵연료의 열수력 기반기술을 개발하고 실용화를 위해 대학 및 산업체와 협력연구도 진행하였다.

• 대한조선학회논문집
• /
• 제50권6호
• /
• pp.421-428
• /
• 2013

This study aims at numerically investigating the angle of attack characteristics of the rudder behind a rotating propeller. The rotating propeller of 5 blades and the full spade rudder are placed in the numerical water tunnel with a uniform flow condition to consider propeller-rudder interaction. The turbulence closure model is employed to simulate the three-dimensional unsteady incompressible viscous turbulent flow around the propeller and the rudder. The present numerical method are well verified by comparing with the experimental results. In order to identify the dependence of the angle of attack of the rudder on the rudder angle, a wide range of rudder angles is considered. The present study carried out the quantitative and qualitative analysis of the angle of attack in terms of the pressure distribution, streamlines and the evaluation of the flow incidence, resulting in that the angle of attack increases as we move from the root and the tip to the center of the rudder, regardless of the rudder angle. The distribution of the angle-of-attack along the span is strongly affected by rotating propeller flow and rudder angle. Consequently, the distribution of the angle-of-attack of the oncoming flow against the rudder leading edge plays a role in determination of rudder performance.

• 한국해안·해양공학회논문집
• /
• 제30권4호
• /
• pp.153-165
• /
• 2018

본 연구는 olaFlow을 이용하여 먼저 소스에 의한 불규칙파의 조파에서 목표주파수스펙트럼과 조파된 파랑의 주파수스펙트럼과의 비교 검토로부터 olaFlow의 타당성을 검증하였다. 이로부터 불규칙파랑 하 3차원투과성잠제를 대상으로 잠제 주변에서 형성되는 파고분포와 같은 수면변동의 특성과 설상사주의 주요외력으로 작용하는 평균유속, 연안류 및 난류운동에너지 등을 포함한 유속장의 특성을 수치적으로 검토하였다. 수치해석결과에 따르면 잠제 사이의 개구폭이 감소할수록 개구부 중앙에서는 자승평균평방근파고가 증가하지만 개구부 배후에서는 자승평균 평방근파고가 감소하며, 잠제의 개구폭이 넓을수록 강한 연안류가 형성됨과 동시에 수송유량이 증가되는 것을 확인할 수 있었다. 이로부터 잠제 배후에 형성되는 설상사주의 형성원인을 파악할 수 있었다.

• 설비공학논문집
• /
• 제3권2호
• /
• pp.142-151
• /
• 1991

In the present investigation, it has been proposed to utilize a direct contact heat exchanger as an evaporator to solve the difficulties such as scaling, corrosion and law thermal efficiencies, associated with the conventional evaporator. Liquified nitrozen was utilized as a working fluid to investigate basic natures of bubble dynamics in the evaporator, and spray nozzles were adopted to inject liquified nitrozen into the spray column with varying flow rates of dispersed phase fluids. Experimentations were carried out in the range of $6.54{\times}10^{-4}kg/s$ - 0.030 kg/s for dispersed phase flow rates with one, three and five nozzle holes. Observing the bubble dynamics for the evaporator the feasibility of utilizing a direct contact heat exchanger as a LNG evaporator has been evaluated. The results show that no eruption phenomena was observed in the present investigation with $LN_2$ and the interface between $N_2$ bubbles and water was fully turbulent. It is believed that the high injection velocity of $LN_2$ through the spray nozzles provide good mixing effects for both heat and mass transfers between water and $N_2$ bubbles. Ice was formed on the surface of the spray nozzle for higher $LN_2$ flow rates. However, even in this case, it is observed that the ice was detached as soon as it was formed. Under the present experimental conditions, the shapes of $LN_2$ bubbles were in the spherical-cap region according to the Clift, Grace and Weber Graphs. The height of foam region caused by the breakup of larger bubbles keeps increasing with high injection velocities until it reaches it's maximum height.

• 물과 미래
• /
• 제22권2호
• /
• pp.191-200
• /
• 1989

소류사의 입자이동속도와 소류사농도의 곱으로 소류사량을 계산할 수 있는 한 방법이 제시되었다. 본 연구에서 사립의 평균이동속도는 하상부근의 유속난류성분의 출현빈도가 정규분포 한다고 가정하고, 입자이동속도를 소류력의 함수와 하상부근의 평균유속의 곱으로 나타내었다. 소류사에 유효하게 작용하는 소류력을 구하기 위해서 Engelund가 제시한 식을 사용하여 유효마찰속도를 구하였으며 Engelund가 제시한 식의 적합성을 간접적으로 검증했다. 소류사농도를 구하기 위해서 호전·도상의 식을 사용하였다. 실험자료는 타 연구자들의 식과 비교되었으며 타 연구자들의 식과 비슷한 경향을 나타내었다. 소류력이 비교적 작은 경우를 제외하고 제시된 식에서 계산된 결과와 타연구자들의 자료는 잘 일치하였다.

• 수산해양기술연구
• /
• 제42권2호
• /
• pp.86-96
• /
• 2006

This research aims at establishing the fundamental characteristics of the kite through the analysis of the flow field around various types of kites. The approach of this study were adopted for the analysis; visualization by PIV(particle image velocimetry). Also, the lift and drag tests of kites had been performed in our previous finding(Bae et al., 2004a; Bae et al., 2004b). For this situation, models of canvas kite were deployed in the circulating water channel for the PIV test using the same conditions as in the lift and drag tests. The results obtained from the above approach are summarized as follows: Given the rectangular and triangular kites when attack angle is $20^{\circ}$, vortex by the boundary layer separation was seen in the leading edge and the flow towards the trailing edge was more turbulent. But, the inverted triangular type kite was seen to be stable without any boundary layer separation or turbulence. The increase of the attack angle resulted in the eddy in order of the rectangular, triangular and inverted triangular type. The magnitude of the eddy followed the same order. The effect of edge-eddy was biggest in the triangular type followed by the rectangular and then the inverted triangular type. The kite as the buoyancy device or the opening device will be very useful when the appropriate applications and the stability are met.

• Journal of Advanced Marine Engineering and Technology
• /
• 제28권3호
• /
• pp.500-508
• /
• 2004

The heat transfer coefficients during gas cooling process of carbon dioxide in a horizontal tube were investigated. The experiments are conducted without oil in the refrigerant loop. The main components of the refrigerant loop are a receiver, a variable-speed pump, a mass flow meter, a pre-heater, and a gas cooler(test section). The water loop consists of a variable-speed pump, an isothermal tank, and a flow meter. The gas cooler is a counterflow heat exchanger by cooled water flowing in the annulus. The $CO_2$ flows in the horizontal stainless steel tube. which is 9.53mm in O.D. and 7.75mm in I.D. The gas cooler is 6 [m] in length. which is divided into 12 subsections, respectively. The experimental conditions considered in the study are following range of variables : refrigerant temperature is between 20 and $100^{\circ}C$. mass fluxes ranged from 200 to 400kg/($m^2$.s), average pressure varied from 7.5 to 10.0MPa. The main results were summarized as follows : The friction factors of $CO_2$ in the gas cooler show a relatively good agreement with those predicted by Blasius' correlation. The local heat transfer coefficient in the gas cooler has compared with most of correlations, which are the famous ones for forced convection heat transfer of turbulent flow. The results show that the local heat transfer coefficient of gas cooler agrees well with the correlation by Bringer-Smith except that at the region near pseudo critical temperature. while that at the near pseudo critical temperature is higher than the correlation.