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펠턴 버킷 수 선정에 관한 이론 분석 및 버킷 수 변화에 따른 성능 시험
김정원(Jeong Won Kim),조인찬(In Chan Jo),박주훈(Joo Hoon Park),신유환(Youhwan Shin),정진택(Jin Taek Chung) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, an analytic formula that gives the optimal number of buckets is developed in order to design high efficiency Micro-Hydro Pelton turbine. The formula is derived from the condition of incidence angle minimizing losses in the bucket. To prove the validity of the formula, runners with different numbers of buckets are used and efficiency of Pelton turbine is measured under the various flow rate and pressure. Experimental result demonstrates that runner with the number of buckets given by the formula shows maximum efficiency of Pelton turbine. This formula gives insight into how appropriate number of buckets is selected in designing high efficiency of Pelton turbine.
CFD 시뮬레이션 공력 성능 기법을 이용한 터보차저 휠 공력 특성이 스러스트 베어링 추력에 미치는 영향에 관한 연구
김동철(Dong Chul Kim),조인찬(In Chan Jo),권영후(Young Hoo Kwon),송명의(Myeong Eui Song),이채규(Chae Gyu Lee) 대한기계학회 2018 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.6 No.2
터보차저란 엔진 배기가스 유동 에너지로 터빈을 돌린 후, 이 회전력으로 컴프레서를 돌려서, 흡입되는 공기를 대기압 보다 높은 압력으로 밀어 넣어 엔진 성능을 극대화 시키는 장치이다. 터보차저회전 시, 컴프레서 및 터빈 휠의 공력에 의한 추력이 발생되며, 로터다이나믹 시스템의 축 방향으로 추력이 전달된다. 이때 축 방향으로 발생된 추력을 지지해주는 스러스트 베어링이 필요하게 되며 스러스트 베어링 설계를 위해 지지 가능한 추력 산출이 요구된다. CFD 해석을 이용하여, 휠의 추력을 산출하고, 컴프레서와 터빈 휠의 매칭을 통해, 베어링 추력 예측 방법을 알아보고자 한다. 본 연구를 통해 휠의 추력이 스러스트 베어링에 미치는 영향에 대하여 개발 프로세스를 정립하고자 한다. The turbocharger is a device that turns the turbine with engine exhaust gas flow energy, turns the compressor with this torque, and maximizes the performance of the engine by pushing the intake air to a pressure higher than atmospheric pressure. During turbocharger rotation, thrust is generated by the aerodynamic forces of the wheel. And thrust is transmitted in the axial direction of the rotor dynamical system. At this time, a thrust bearing supporting the thrust generated in the axial direction is required. Therefore, for the thrust bearing design, it is required to calculate the thrust force that can be supported. The CFD analysis is used to calculate the thrust of the wheel and to find out how to predict the bearing thrust through the matching of the compressor and the turbine wheel. Through this study, we investigate the effect of wheel thrust on thrust bearing and establish the development process of thrust bearing.
조은하,조인찬,박영철,최영환 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.33 No.4
We experienced a case of unilateral vocal cord paralysis following tracheal extubation. The patient was a 60-year-old man undergoing subtotal gastrectomy. He had no laryngeal symptoms prior to operation and the trachea was intubated with a cuffed endotracheal tube. The surgical procedure lasted 6 hours and was uneventful. Three days later after operation, he began to complain of hoarseness and mild aspiration symptom. On endoscopic examination, left vocal cord paralysis was found. Fifteen weeks later the voice and left vocal cord function return to normal without specific management. In this case, we suggested that possible causes of unilateral vocal cord paralysis are compression of recurrent laryngeal nerve by overexpanded endotracheal cuff, laryngeal trauma during difficult intubation, stretching of the nerve as a result of traction on distant organ, decreased elasticity of trachea and surrounding tissues in the older age group and long operating time. (Korean J Anesthesiol 1997; 33: 788∼791)
상복부 수술환자의 술후 장운동 회복에 대한 경막외강내 Bupivacaine 과 Morphine 의 혼주의 효과
박영철,조은하,조인찬 대한마취과학회 1996 Korean Journal of Anesthesiology Vol.31 No.3
Background: The stress of operation inhibits bowel motility. The blockade of efferent sympathetic nerve is helpful to recovery of bowel motility. So we tried to examine that the extent of sympathetic blockade by alterations of bupivacaine infusion rate affected the recovery of bowel motility. Methods: Group l (N = 25) received postoperative meperidine intramuscular injection on demand as a control group, group 2 (N = 25) received postoperative epidural 0.125% bupivacaine 100 ml plus morphine lOmg by infusion pump, I ml/hour, for 4days, group 3 (N = 25) received 0.125% bupivacaine 400 ml plus morphine lOmg by infusion pump, 4 ml/hour, for 4days. The Group 2 and 3 received additional morphine 2mg in 0.2% bupivacaine 10 ml epidurally as a single bolus when the peritoneum was closed. The time interval from termination of operation to the first passage of flatus was estimated. Results: In group l, bowel motility was regained at 92±23 hours, group 2; 90+ 19 hours and group 3; 91±19 hours. All values are not signicantly different among the groups (p$gt;0.05). Conclusions: The alteration of epidura1 bupivacaine and morphine infusion rate did not affect the recovery of postoperative bowel motility.