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75톤급 재생냉각 연소기 기술검증용 시제 설계 및 제작
김종규(Jonggyu Kim),안규복(Kyubok Ahn),임병직(Byoungjik Lim),김문기(Munki Kim),강동혁(Dong-Hyuk Kang),최환석(Hwan-Seok Choi) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5
75톤급 일체형 재생냉각 연소기 기술검증용 시제의 설계 및 제작에 대하여 기술하였다. 기술검증용 연소기의 설계 연소압력은 60 bar, 추진제 유량은 243.6 kg/s, 그리고 노즐 팽창비는 12이다. 헤드부와 추력실부가 용접되는 일체형 재생냉각형 연소기이다. 본 기술검증용 시제품을 통해 확립된 설계 및 제작 기술들은 비행용 모델 개발에 활용될 것이다. Design and fabrication of Technology Demonstration Model(TDM) of 75 tonf regenerative cooling thrust chamber were described. It has design chamber pressure of 60 bar, propellant mass flow rate of 243.6 kg/s, and nozzle expansion ratio of 12. It has a single welded structure of the mixing head and the chamber. Design and fabrication technologies established through this TDM can be used to development of flight model.
임병직(Byoungjik Lim),한영민(Yeoung-Min Han),김종규(Jong-Gyu Kim),서성현(Seonghyeon Seo),안규복(Kyubok Ahn),김문기(Munki Kim),이광진(Kwang-Jin Lee),최환석(Hwan-Seok Choi) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.5
한국형발사체 엔진에 사용될 것으로 예상되는 75톤급 연소기의 기술검증시제를 이용하여 2회 연소시험을 수행하였다. 설비 공급 능력과 구조물 강도 제한으로 정상 유량의 50% 수준에서 시험이 수행되었다. 채널냉각 연소기를 이용한 저압연소시험을 통해 점화구간과 연소구간에서의 신뢰도와 안정성이 확인되었다. 더불어 75톤 연소기가 성능요구조건을 만족시킬 수 있을 것으로 추정할 수 있었다. Using the technology demonstration model of 75-tonf-class combustor which is expected to be used to the rocket engine of a korean space launch vehicle, 2 times of firing tests were carried out. Firing tests were done at 50% of the nominal flow rate because of incapability of the test facility and limit of the test bed strength. Through the low pressure firing tests of 75-tonf-class channel cooling thrust chamber, reliability and stability at the ignition and combustion phases were confirmed. Additionally it was foreseen that the 75-tonf-class thrust chamber would satisfy the performance requirements.
신지영,손영석,김상민,이대영 대한설비공학회 2004 설비공학 논문집 Vol.16 No.7
Rapid development of electronic technology requires small size, high density packaging and high power of electronic devices, which result in more heat generation by the electronic system. Present cooling technology may not be adequate for the thermal management in the current state-of-the-art electronic equipment. Forced convective heat transfer in a channel filled with pin-fin array is studied experimentally in this paper as an alternative cooling scheme for a high heat-dissipating equipment. Various configurations of the pin-fin array are selected in order to find out the effect of spacing and diameter of the pin-fin on the heat transfer and pressure drop characteristics. In the low porosity region, interfacial heat transfer and pressure drop seem to show different trend compared to the conventional heat transfer process.
정주영(Jung, Juyeong),권태순(Kwon, Taesoon),박원희(Park, Won-Hee),이덕희(Lee, Duckhee) 한국방재학회 2021 한국방재학회논문집 Vol.21 No.5
전 세계적인 친환경 정책 이슈로 인한 에너지 시장의 성장은 ESS (Energy storage system)와 관련된 리튬이온전지 시장의 동반 성장을 불러오고 있다. 그러나 리튬이온전지를 사용한 ESS에서 화재사고가 발생하면 리튬이 함유된 전기화재 특성과 셀 단위 전지를 하우징하여 관리하는 구조적 특성으로 인해 화재 발생시 소화 약제의 침투가 어려워 기존 소화 시스템으로의 대처한계가 명확하다. 이러한 이유로 ESS는 화재 사전예방 및 확산방지 시스템에 대한 연구가 필요하며, 이 논문에서는 Computational fluid dynamics (CFD)를 활용하여 실제 적용이 용이한 냉각제인 Phase change material (PCM)과 열전소자의 냉각특성을 평가하였다. PCM을 활용한 냉각모델에서는 PCM의 질량과 승온 시간의 상관관계 분석을 통해 발열전지의 온도가 정상범위에서 벗어났을 때 PCM을 통한 온도조절이 가능함을 확인하였으며, 열전소자를 활용한 냉각모델에서는 200 W의 발열 조건에서 출력이 40 W인 모델의 해석결과를 통해 발열량과 열전소자의 출력이 단시간에 열평형을 이룰 수 있음을 확인하였다. The growth of the energy market due to global eco-friendly policy issues is leading to the growth of the lithium-ion battery market related to the energy storage system (ESS). However, if a fire occurs in an ESS using lithium-ion batteries, it is difficult to penetrate fire extinguishing agents due to the structural characteristics of lithium-containing electrical fire and cell-unit batteries. For this reason, ESS needs to study fire prevention and diffusion prevention systems; in this paper, computational fluid dynamics (CFD) are utilized to evaluate the cooling properties of PCM and thermoelectric devices, which are easy to apply in practice. In the PCM model, the correlation between the mass of the PCM and its temperature rise time confirmed that temperature control through PCM is possible when the temperature of the heating battery is out of the normal range. In the thermoelectric module, the numerical results of the model with an output of 40 W under the input power of 200 W confirmed that the heating value and the output of the thermoelectric module can create thermal equilibrium in a short time.
박창현(C. H. Park),홍승수(S. S. Hong),김종률(J. R. Kim),박승상(S. S. Park),황형식(H. S. Hwang) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The TES (Thermal Energy Storage) cooling system utilizing cheaper off-peak electricity has been applied just for building air-conditioning currently and causes limitation of usage rate and inefficiency of national resources utilization. In this regard, more says the necessity to apply TES system in industrial cooling system which is longer using period and wider usage. In this study, we will approve the technical and economical improvement in efficiency of industrial cooling system applied TES system by utilizing cheaper off-peak electricity and it will attribute the promotion of TES system and stabilization of supply and demand of electric power by proving the necessity to develop more efficient industrial cooling system by combining TES system.
히트파이프 열교환기를 이용한 전자통신장비 콘솔의 냉각 기술에 관한 연구
최지훈(Jee-Hoon Choi),유성열(Seong-Ryoul Ryoo),성병호(Byung-Ho Sung),이정환(Jung-Hwan Lee),김종만(Jong-Man Kim),전지환(Ji-Hwan Chun),서명원(Myung-Won Suh),김철주(Chul-ju Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The fan is widely used to cool high heat flux generated as of the electronic communication device consoles. It, however, makes a lot of noises that interfere considerably with the operation environment. This study was conducted to obtain the cooling design technology of the consoles through being equipped with the Heat Pipe Heat Exchangers (HPHE) together with low revolution fans in place of existing fans for the cooling technology of the forced convection. Not only the sealed type consoles but the HPHE were also designed so as to cool effectively the heat generated from the inside of the console. The simulation was conducted by computational numerical analysis along with its experiments. The results of the numerical analysis and experiments were compared in order to improve the cooling technology of the consoles mounted with the HPHE. Consequently, instead of loud fan noise generated as of existing forced convection methods, the cooling technology of HPHE can remarkably improve many problems such as the operation environment, indoor dust, malfunction caused by pollution sources and so on.
임동현(Dong Hyun Lim),김대건(Dae Geon Kim),신윤혁(Yoon Hyuk Shin),김성철(Sung Chul Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The thermal performance evaluation of an air-cooled in-wheel motor in electric vehicles was performed under driving operation condition in consideration of ram air effect. We verified the feasibility of the air cooling method for the 25 kW motor with the housing geometry having cooling grooves and investigated the thermal performance enhancement. In addition, the thermal performance of an oil-cooled in-wheel motor with various cooling systems was compared under the operation condition. Therefore, the oil spray cooling system for the 35 kW motor with interior cooling channels was judged to have the best thermal performance.
임병직(Byoungjik Lim),한영민(Yeoung-Min Han),김종규(Jong-Gyu Kim),최환석(Hwan-Seok Choi) 한국추진공학회 2011 한국추진공학회지 Vol.15 No.1
Firing tests have been carried out for a technology demonstration model of 75-tonf-class combustor which is to be used on the liquid rocket engine of a Korean space launch vehicle. Firing tests were done at 50% of the nominal flow rate because of incapability of the test facility and limit of the test bed strength. Through the low pressure firing tests of 75-tonf-class channel cooling thrust chamber, operability and stability at the ignition and combustion phases were confirmed. Additionally it was foreseen that the 75-tonf-class thrust chamber would satisfy the performance requirements.