• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.605-607
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• 2011

자동차의 연료비 절감 대책으로 연소 효율 증대를 위해서 연소실의 와류를 형성시켜주는 장치를 Modeling하여 유동해석을 실시하였다. 와류발생장치가 장착되지 않은 형태의 Model과 와류발생장치의 형태가 다른 Model을 설계하였다. 와류발생장치는 공기의 연소실 흡입 전에 설치되어 와류발생장치의 날개에 의해 흡입공기를 휘감으며 와류를 발생시키게 된다. 본 연구에서는 와류발생자치를 사용함으로써 흡입 공기의 유동과 흡입행정의 압력분포를 해석하여 와류발생장치의 효과를 확인할 수 있다.

• Proceeding of EDISON Challenge
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• 2016.11a
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• pp.9-14
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• 2016

버드 스트라이크는 항공기 안전에 큰 위협을 주고 있다. 새를 막기 위하여 공항에서 여러 가지 방법들을 이용해 새를 쫓고 있지만 임시방편인 경우가 많거나 근본적인 방법은 아니다. 본 연구에서는 이러한 버드 스트라이크를 막기 위하여 새를 막는 장치를 엔진 흡입구에 장착하고, 이 흡입구가 엔진 흡입구의 성능에 어떠한 영향을 주는지 알아보려고 한다.

• Fire Science and Engineering
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• v.17 no.4
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• pp.86-91
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• 2003

Since the air stream in the room controlled by HVAC system affects on he expected response of conventional detectors which are designed in accordance with normal characteristics of air stream in the fire incident, unexpected operation time delay may occur in fire. In order to solve this problem and to improve sensitivity so that to initiate fire in its early stages for minimizing damage and protecting people, we studied and developed Air Sampling Smoke Detector. The Air Sampling Smoke Detector is a kind of active-type fire detection system. it draws air continuously from the protected area through an air sampling pipe network to the smoke density analyzer. This study presents smoke density analysing technique and air intake balancing technique through an air sampling pipe network. As a result of evaluating, Air Sampling Smoke Detector was much more sensitive than conventional smoke detectors that passively wait for smoke to reach them and was not affected by ambient airflow in the room by means of balanced air intake through the sampling holes.

• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.4
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• pp.500-506
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• 2012

A method to model left ventricular assist device (LVAD) and detect suction occurrence for safe LVAD operation is presented. An axial flow blood pump as a LVAD has been used to assist patient with heart problems. While an axial flow blood pump, a kind of a non-pulsatile pump, has relative advantages of small size and efficiency compared to pulsatile devices, it has a difficulty in determining a safe pump operating condition. It can show different pump operating statuses such as a normal status and a suction status whether suction occurs in left ventricle or not. A fuzzy subtractive clustering method is used to determine a model of the axial flow blood pump with this pump operating characteristic and the developed pump model can provide blood flow estimates before and after suction occurrence in left ventricle. Also, a fuzzy subtractive clustering method is utilized to develop a suction detection model which can identify whether suction occurs in left ventricle or not.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.572-582
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• 2017

It is definitely important to measure thrust during ground test when developing air-breathing engine, and in case of air-breathing engine, gross thrust should be calculated considering not only the measured thrust but also the force induced by the air flow of engine intake. Also, side thrust like yaw and pitch should be measured and analyzed using multi-component thrust measurement system. Engine performance was accurately evaluated by calculating the gross thrust of air breathing engine precisely which is analyzed from below serial procedure: labyrinth seal isolation, 1-axis gross thrust calculation, develop multi-component thrust measurement system, and side thrust analysis.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.60-60
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• 2018

최근 도시지역의 불투수율 증가로 인한 유역의 도달시간 감소와 첨두유출량이 증가함에 따라 내수침수 잠제 위험성이 증가하고 있다. 이에 우수배제 시스템의 수방능력 향상을 위한 빗물펌프장의 신설 및 증설에 대한 요구가 증가하고 있다. 하지만 빗물펌프장의 신설 및 증설에는 건설부지 확보의 문제와 비용적인 문제 등의 현실적인 현계들이 있다. 따라서 기존에 설치되어 있는 빗물펌프장의 배수효율을 증대시킬 수 있다면 빗물펌프장의 신설 및 증설에 따른 과도한 예산지출을 줄일 수 있을 것이다. 빗물펌프장의 배수효율은 흡입부 내에서 발생하는 와류를 얼마나 잘 제어하느냐에 따라 크게 달라진다. 만약 흡입부 내에 강한 와류가 존재한다면, 흡입관 주위에서 선회류를 유발시켜 펌프 효율을 떨어뜨리는 원인이 된다. 따라서 펌프 운영 시 흡입부 내에서 발생하는 와류를 제어하기 위하여 와류발생 저감장치(Anti Vortex Device)를 설치하여 와류를 제어하는 방법을 이용하고 있다. 하지만 국 내외 빗물펌프장 설계기준에서 와류발생 저감장치에 대한 정량적인 효과는 제시되어 있지 않다. 따라서 본 연구에서는 PIV(Particle Image Velocimetry)를 이용하여 와류발생 저감장치가 펌프 흡수조에 설치되었을 때 흐름특성 및 와도분포 분석을 통해 와류발생 저감장치의 형태에 따른 효과를 정량적으로 분석하고자 한다. 그 결과 와류발생 저감장치를 설치 한 후 흐름개선효과를 확인하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.7
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• pp.2945-2950
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• 2011

As the step to improve fuel efficiency, there is the system to build up the eddy of combustion chamber at the suction line in order to increase the combustion efficiency. The models installed with no vortex generation system or with various shapes of the system are examined by fluid analysis. Vortex generation system is installed prior to the suction of combustion chamber. The wing of this system winds itself around the suction air and generates the vortex. This study investigates the flow of suction air and the pressure distribution of suction stroke by using the eddy generation system.

• Journal of computational fluids engineering
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• v.17 no.2
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• pp.58-64
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• 2012

Turbulent flows in a intake part of vacuum cleaner are studied by RANS simulations. The governing equations are solved by the SIMPLE algorithm based on the finite volume method of the unstructured grid system. The predicted results show that the suction performance is closely related to the variation of flow structure in the intake part. In order to investigate for the cleaning of bedclothes and carpet without sticking, several design changes are applied. The introduction of a solid cylinder in the intake part changes vortical structures significantly. Based on this result, a new design with spiral brushes is proposed. The design shows a good behavior for the suction performance and the flow control.

• Magazine of RCR
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• v.15 no.2
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• pp.39-44
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• 2020

• Proceedings of the Korean Society of Radiological Science
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• 1995.10a
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• pp.128-129
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• 1995