• 플랜트 저널
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• 제9권2호
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• pp.36-41
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• 2013

펌프실 내 펌프가 1대 배치되는 경우 펌프 동력과 펌프기초 면적이 주어지면 펌프실 면적을 찾을 수 있다. 다만, 일부 펌프는 펌프와 발전소 배치 특이성에 따라 펌프실 면적이 결정된다. 그러나 펌프실 내 펌프가 2대 배치되는 경우 펌프 동력과 펌프기초 면적을 이용한 펌프실 면적을 구하는 연계관계를 찾을 수 없다. 그리고 펌프 동력과 펌프기초 면적의 연계관계도 찾을 수 없다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년도 제30회 춘계학술대회논문집
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• pp.49-52
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• 2008

터빈 블레이드의 엣지 형상 변화에 따른 표면 가스온도 발달과정에 대해서 전산해석을 수행하였다. Sharp형과 Round형의 터빈 블레이드를 모델링하였으며, 터빈의 회전수는 두 가지 형상 모두 0${\sim}$10,000 rpm의 회전 속도를 주어 전산해석을 실시하였다. 터빈의 회전수가 증가할수록 터빈 블레이드 표면의 평균 온도는 하강하였고, Sharp형 엣지 형상이 Round형 엣지 형상에 비해서 터빈 블레이드의 표면 온도 분포가 전반적으로 낮은 분포를 나타내었다.

• 한국자동차공학회논문집
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• 제6권5호
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• pp.28-36
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• 1998

In order to establish the hydraulic design process of the torque converter, pump, turbine and stator were designed by reverse design method including one dimensional analysis, angular momentum distribution and forced vortex design. And the significance of evaluation of the circulation flow rate in torus of the torque converter was verified by numerical calculation if the combined blade rows of pump and turbine. It was confirmed that the computational method using interrow mixing model by Park and Cho was reliable to predict the flow-field and performance of the torque converter.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.626-629
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• 2008

In this study, a geothermal power generation system using the Kalina cycle was investigated by the simulation method. The Kalina cycle system can be used for the utilization of a low-temperature heat sources such as geothermal and industrial waste heat that are not hot enough to produce steam. The sea/river water can be considered as a cooling media. A steady-state simulation model was developed to analyze and optimize its performance. The model contains a turbine, a pump, an expansion valve and heat exchangers. The turbine and pump were modelled by an isentropic efficiency, while a condenser, an evaporator and a regenerative heat exchanger were modeled by UA-LMTD method with a counter-flow assumption. The effect of the ammonia fraction at the separator inlet on the cycle performance is investigated in detail.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.569-572
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• 2009

In this study, HFC ORCs (Organic Rankine Cycles) are investigated for a low-temperature geothermal power generation by a simulation method. A steady-state simulation model is developed to analyze and optimize cycle's performance. The model contains a turbine, a pump, an expansion valve and heat exchangers. The turbine and pump are modelled by an isentropic efficiency. Simulations were carried out for the given heat source and sink inlet temperatures, and given flow rate that is based on the typical power plant thermal-capacitance-rate ratio. 3 HFC fluids are considered as a candidate for a working fluid of low-temperature ORCs. In this study, all optimized HFC ORCs are shown to yield almost the same performance in terms of power for a low-temperature heat source of about $100^{\circ}C$.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.985-987
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• 2011

본 논문은 파생형엔진의 설계를 위해 시동시간 예측모델을 개발하는 경우를 다루었다. 파생형엔진 설계를 위해 압축기/터빈의 특성맵을 새로 제안한 Modified Pump Scaling Law(MPS)방법을 사용하여 시동모델링에 필요한 아이들 이하 회전수(sub idle rpm) 영역으로 확장시켰고, 기준엔진의 손실특성에서 압력/온도와 엔진별 특성차이를 고려한 파생형엔진의 손실모델을 도출하였다. 이러한 특성을 반영한 파생형엔진의 시동시간 예측모델은 시험결과와 비교하여 비교적 양호한 결과를 나타내었다.

• 소음진동
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• 제8권5호
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• pp.922-928
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• 1998

This paper presents the automatic alignment measuring system for improving the accuracy and working time of alignment of large vertical hydraulic pump turbine. It is general practice that rotating shaft should run within acceptable vibration limit. In order to obtain better run-out data of multi-stage rotor, careful and accurate alignment approach must be established. Generally, present alignment procedure are required several iterative works and so many manpower. Therefore, the new system has been developed using a vector calculation algorithm, laser sensor and data acquisition devices. As a result of appling to actual machines, it is confirmed that manpower is saved up to an average 90%.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회B
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• pp.3159-3162
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• 2008

A sensitivity analysis of the liquid rocket engine has been made. A mode analysis program is used to predict the performance change due to the variation of rocket engine operating environment. The propellant supply pressure and density are the major variables of the operating condition. The material properties of the turbine driving gas is assumed as the function of mixture ratio. The discrepancies of performance change between constant turbine driving gas properties and variable properties are greater for the case of fuel pump inlet pressure change than the oxidizer pump inlet pressure change.

• Structural Engineering and Mechanics
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• 제88권6호
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• pp.569-581
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• 2023

This paper introduces a system to detect and diagnose anomalies in pumped storage hydropower plants. We collect data from various types of sensors, including those monitoring temperature, vibration, and power. The data are classified according to the operation modes (pump and turbine operation modes) and normalized to remove the influence of the external environment. To detect anomalies and diagnose their types, we adopt a multivariate normal distribution analysis by learning the distribution of the normal data. The feasibility of the proposed system is evaluated using actual monitoring data of a pumped storage hydropower plant. The proposed system can be used to implement condition monitoring systems for other plants through modifications.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.317-320
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• 2011

과산화수소와 케로신을 이용한 이원액체추진제 로켓엔진을 위한 산화제 터보펌프를 설계하였으며 수류시험을 통해 설계된 터보펌프의 작동여부를 실험하였다. 과산화수소 터보펌프의 설계조건을 결정하고 펌프의 임펠러를 설계하였다. 펌프를 구동하기 위한 터빈을 차량용 터보차저로 선정하였으며 터빈 맵을 이용하여 가스발생기를 설계하였다. 펌프, 터빈과 가스발생기를 통합하여 터보펌프 시스템을 구축하였으며 수류시험을 통해 터보펌프 시스템이 1.47 bar의 압력으로 3.4 kg/s의 유량을 공급하는 것을 확인하였다.