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박종후(Jong-Hwoo Park),정경남(Kyung-Nam Chung),김양익(Yang-Ik Kim),조성희(Seoung-Hee Cho) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
A steam turbine is one of propulsion systems of a LNG carrier, which consists of high pressure (HP) and low pressure (LP) turbines. In order to obtain high power, each one has the form of a multi-stage turbine. Especially, the first stage of a HP turbine is Curtis stage and uses partial admission considering the turbine efficiency. The performance of a HP turbine can be predicted by a mean-line analysis method, because the relatively large value of hub-tip ratio makes the three-dimensional losses small. In this study, a performance analysis method is developed for a multi-stage HP turbine using Chen’s loss model developed for the transonic steam turbines. To consider the feature of partial admission, different partial admission models are reviewed. This analysis method can be used in partial load conditions as well as full load condition. The calculation results are also compared with the CFD results about some simple cases to check the accuracy of the program. Performance of two HP turbine models are calculated, and the calculation results are compared with the designed data. The comparison shows the qualitative performance analysis result.
정경남(Kyung-Nam Chung),박종후(Jong-Hwoo Park),김용균(Yong-Kyun Kim),김해천(Hae-Cheon Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this paper, a study of performance improvement for a centrifugal vertical pump having specific speed of 330 is introduced. The existing model has high efficiency but needs better NPSH required performance. Such that new pump model is designed to obtain larger suction specific speed. 6 design parameters considered to affect pump performance are selected for impeller design. Key design parameters are investigated using by design of experiments and CFD, and impeller inlet diameter is increased to get better suction performance, Pump efficiency and NPSH required value are analyzed by using CFD. The results show that new design model has higher efficiency and better NPSH required performance.
정경남(Kyung-Nam Chung),박종후(Jong-Hwoo Park),김용균(Yong-Kyun Kim),김해천(Hae-Cheon Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.11
In this paper, a study of performance improvement for a centrifugal vertical pump having specific speed of 330 is introduced. The existing model has high efficiency but needs better NPSH required performance. Such that new pump model is designed to obtain larger suction specific speed. 6 design parameters considered to affect pump performance are selected for impeller design. Key design parameters are investigated using by design of experiments and CFD, and impeller inlet diameter is increased to get better suction performance. The amount of inlet diameter increase is determined by using cavitation analysis. The results show that new design model has higher efficiency and better NPSH required performance than the existing model.
정경남(Kyung-Nam Chung),김진영(Jin-Young Kim),박종후(Jong-Hwoo Park),김용균(Yong-Kyun Kim),김해천(Hae-Cheon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study deals with hydraulic design of a submergible pump which is installed near the bottom of Ulsan oil stockpiling site. It is used to unload crude oil to a tanker and is run by a 2,800 ㎾ electric motor. This pump has the largest size in the world so far and is a vertical pump with diffuser. Pump design has been carried out by using the analyzed results obtained from the numerical calculations for the effects of several design parameters such as impeller diameter, exit breadth, impeller leading-edge profile, diffuser inlet blade angle, etc. Pump efficiency has been improved by getting rid of flow separation which is generated on the impeller blade due to high pump head and limitation of pump size. NPSH required performance has been improved by applying the above mentioned numerical studies. It has been confirmed from full-scale tests that the pump design is performed satisfactorily.
안성찬(Sung Chan An),김승욱(Seung Ook Kim),김준철(Joon Cheol Kim),박승현(Seung Hyun Park),박종후(Jong Hwoo Park),박현중(Hyun Joong Park),조영우(Young Woo Jo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, we will explain the need for a virtual model so-called Digital Twin technology in the ship engine field, and the applications of the virtual models. Unlike small automobile engines, ship engines need a lot of time and cost to do experiments. The development of the virtual models in the field of ship engines is essential to get competitiveness in the ship engine business. Hyundai Heavy Industries (HHI) virtual model technology, which will be introduced in this paper, can be divided into three main areas. Virtual models are used for the following areas: engine design, engine testing, and maintenance. In engine design, a predictive model is constructed based on combustion analysis, structural analysis, and performance analysis to predict engine performance required for designing the target value. For engine testing, the total number of tests can be reduced by using virtual models to determine the direction of the test or in conjunction with existing test data to reduce time and cost. In terms of maintenance, the ship engine’s big data system is used based on numerous engine operating data accumulated so far and is used to predict failures and diagnose engines by utilizing virtual models with AI technology. Lastly, this paper will be concluded by discussing the future of virtual model technology in the ship engine field by introducing “Smart Engine 5.0” which is the future of the virtual model pursued by HHI.