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김중석(Joung-seok Kim),이우상(Wu-sang Lee),류제욱(Je-wook Ryu) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This paper describes the aerodynamic design procedure for axial turbines of small heavy duty gas turbine engines being developed by Doosan Heavy Industries. The design procedure consists of mainly three parts, namely, flowpath design, airfoil design, and 3D performance calculation. To design the optimized flowpath, throughflow calculations, as well as the loss estimation, are widely used to evaluate the effect of geometric variables, e.g. shape of meridional plane, mean radius, blades axial gap, hade angle, etc. During airfoil design procedure, the optimum blade count is calculated by empirical correlations based on in/outlet flow angles, and then 2D airfoil planar sections are designed carefully, followed by 2D B2B NS calculations. The designed planar sections are stacked along span direction, leading to 3D surface airfoil shape. To consider 3D effect on turbine performance, 3D multistage Euler calculation, single row and multistage NS calculations are performed.
Press-through Package에 의한 소장 천공 1예
김중석 ( Jung Seok Kim ),차재명 ( Jae Myung Cha ),곽민섭 ( Min Seob Kwak ),윤진영 ( Jin Young Yoon ),전정원 ( Jung Won Jeon ),신현필 ( Hyun Phil Shin ),주광로 ( Kwang Ro Joo ),이정일 ( Joung Il Lee ),김혜영 ( Hye Young Kim ) 대한소화기학회 2017 대한소화기학회지 Vol.70 No.5
With an increased use of the press-through package (PTP) tablet, there has also been an increase in mis-swallowing cases, especially in elderly patients. We report a rare case of PTP-induced small bowel perforation and fistula formation with adjacent small bowel in a healthy elderly patient, who experienced persistent abdominal pain of unknown cause. A 62-year-old healthy man was admitted to our hospital with left abdominal pain that started one month ago. Neither abdominal tenderness nor rebound tenderness was present on physical examination. His vital signs and all other test results were within normal limits. However, a 2.5 cm curved radiopaque material within his thickened small intestine was incidentally detected on an abdominal computed tomography. He underwent laparoscopic small bowel resection, which revealed foreign body in the distal small intestine. Edema, perforation, and adhesions with the surrounding tissues were also noticed in the distal small intestine. Foreign body was turned out to be PTP, and this was considered to be responsible for the small bowel perforation and fistula formation. Precautions regarding PTP usage are necessary to prevent inadvertent PTP ingestion and its related complications, such as perforation, especially in the elderly population. (Korean J Gastroenterol 2017;70:261-264)
과립구집락자극인자 투여로 치료한 범혈구감소증과 피부 박리를 보인 붉은사슴뿔버섯 중독 1례
김중석 ( Jung Seok Kim ),김규원 ( Gyu Won Kim ),정재일 ( Jae Il Chung ),심명기 ( Myoung Ki Sim ),윤기철 ( Ki Chul Yoon ),최용훈 ( Yong Hoon Choi ),이하람 ( Ha Ram Yi ),최인주 ( In Zoo Choi ),심찬섭 ( Chan Sup Shim ),한정호 ( Joung 대한임상독성학회 2015 대한임상독성학회지 Vol.13 No.1
Podostroma cornu-damae is a rare species of fungus belonging to the Hyocreaceae family. Its fruit body is highly toxic, as it contains trichothecene mycotoxins. The morphology is similar to that of immature Ganoderma lucidum, making identification difficult for non-experts. We experienced such a case of a 56- year-old male who picked and consumed podostroma cornu-damae, and consumed. Later that day, he developed digestive system symptoms, including nausea, vomiting, and abdominal pain. He presented to the emergency room (ER), there were no abnormal physical findings, symptoms improved after gastric lavage, and the patient voluntarily discharged himself on the same day. The following day, as the symptoms gradually deteriorated, he was admitted via the ER. He was presented with severe pancytopenia, alopecia, desquamation of skin, and acute renal failure. He recovered without any complications after conservative care, antibiotics therapy, and granulocyte colony stimulating factor administration. The most commonly reported complications of podostroma cornu-damae intoxication were reported pancytopenia, infection, disseminated intravascular coagulation, acute renal failure, etc. since Prevention is especially important because its toxicity can be lethal and there is no particular treatment to date, prevention is especially important. Promotion and education for the public are needed.
김중석(Joung Seok Kim),이우상(Wu Sang Lee),류제욱(Je Wook Ryu) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.4
본 논문은 두산중공업㈜에서 개발 중인 소형 가스터빈의 축류 터빈 설계 과정을 기술하였다. 축류 터빈의 설계 과정은 크게 유로설계, 익형설계, 3D 성능 계산의 세 단계로 구성되며. 최적의 유로를 설계하기 위해 자오면의 형상, 평균 반경, 블레이드간 간격, 유로 형상각 등 여러 형상 변수에 대해 통과유동계산 및 손실계산을 수행한다. 익형 설계는 유로 설계시 스팬 방향으로 계산된 입출구 유동각을 기준으로 실험상관식을 적용하여 최적의 블레이드 개수를 결정한 후 2D 익형 단면을 설계하며 2D NS 계산을 통해 캐스케이드 유동구조를 검토하여 설계한 단면의 설계적정성을 평가한다. 설계된 2D 익형 단면을 스팬 방향으로 적층하여 3D 익형을 생성하고, 다단 Euler 계산, 단익렬, 다단 NS 계산을 수행하여 3D 유동 특성을 고찰한다. This study describes the aerodynamic design procedure for the axial turbines of a small heavy-duty gas turbine engine being developed by Doosan Heavy Industries. The design procedure mainly consists of three parts: namely, flowpath design, airfoil design, and 3D performance calculation. To design the optimized flowpath, throughflow calculations as well as the loss estimation are widely used to evaluate the effect of geometric variables, for example, shape of meridional plane, mean radius, blades axial gap, and hade angle. During the airfoil design procedure, the optimum number of blades is calculated by empirical correlations based on the in/outlet flow angles, and then 2D airfoil planar sections are designed carefully, followed by 2D B2B NS calculations. The designed planar sections are stacked along the spanwise direction, leading to a 3D surfaced airfoil shape. To consider the 3D effect on turbine performance, 3D multistage Euler calculation, single row, and multistage NS calculations are performed.
김인겸(Inkyom Kim),안윤호(Yunho An),김중석(Joung Seok Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Squealer tip is a well-known design method to reduce the tip leakage flow and increase the turbine efficiency. Various studies have been conducted to find the optimum squealer tip design or to analyze the flow phenomena. In the present study, a numerical analysis using ANSYS CFX was conducted to find an optimum squealer tip design. Various combination of tip gap heights from 0.5% to 2.0% span and squealer tip heights from 0.5% to 5.8% span were analyzed and the results were compared to the wind tunnel test results of the same squealer tip geometry. All of the numerical results over predicted the total pressure loss coefficient but showed similar trends. The squealer tip design of tip gap 1.0% span and squealer tip 1.9% span was selected as the optimum design, excluding those with tip gap 0.5% span which could cause rubbing, and a loss reduction of 8.6% was shown compared to the plane tip design with same tip gap.
덕트 형상 변화가 축류 가스터빈 배기 디퓨져 성능에 미치는 영향
이익상(Iksang Lee),안윤호(Yunho An),김중석(Joung Seok Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this paper, the aerodynamic performance of an axial gas turbine exhaust diffuser is investigated as duct angle is changed. This diffuser consists of an annular diffuser and duct. Steady 3D CFD simulations with SST turbulence model using ANSYS CFX have been carried out to analyze effect of duct angle. The performance of the diffuser was assessed in terms of static pressure coefficient and total pressure loss along the diffuser. Duct angle depended on total length of duct. Performance of exhaust diffuser was significantly improved as duct angles were changed. Also, increasing duct angle and length reduced a range of recirculation zone at duct outlet. It effects on increasing static pressure within whole diffuser system.