http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서종범(Jongbeom Seo),한상조(S. Han) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.12
본 연구에서는 등온 벽에서 가까이에 위치한 유동과 같이 온도 구배가 큰 곳에서 발생하는 전도오차를 줄이기 위해 새로운 열전대의 형상 설계 및 제작 방법을 제안하고자 한다. 전도오차를 줄이기 위하여 지름이 79.9 μm 인 열전대를 이용했으며, 아크 용접을 통해 제작된 상대적으로 접점이 큰 일반 열전대와 다른 butt-welded 열전대를 제작하기 위하여 용접용 5 축 장비가 고안됐다. 열전대의 단면을 맞닿게 하여 용접해 접합부위 크기를 최소화 했다. 온도 보정 실험을 통하여, 일반적인 형상의 열전대와 이 연구에서 제안하는 열전대의 온도 측정 결과가 동일함을 알 수 있었다. 접합부가 79.9 μm 지름을 가지는 butt-welded 열전대를 온도 경계층에 침투시켜서 전도에 의한 오차를 최소화하여 급격히 변하는 온도 경계층의 온도를 효과적으로 측정할 수 있게 되었다. 개발된 센서를 이용하여 선형 터빈 날개가 장착된 풍동에서 온도 경계층을 측정하였고, 측정된 결과를 Nusselt 수로 나타내었다. This research focused on designing an appropriate thermocouple sensor for a thermal boundary layer with a large temperature gradient. It was designed to minimize the conduction error from a constant temperature wall in a boundary layer. A 79.9-μm thermocouple was chosen, and a five-axis device jig was developed to fabricate a buttwelded thermocouple, which is different from arc-welded junction thermocouples. This was used to minimize the size of the thermocouple junction. In addition to fabricating butt-welded thermocouples, a thorough calibration was conducted to decrease the internal error of a multimeter to ensure that the data from the butt-welded and regular thermocouples were almost the same. Based on this method, a butt-welded thermocouple with a small junction was found to be suitable for measuring the temperature in a thermal boundary layer with very large thermal gradients. Using this thermal boundary layer probe, the thermal boundary layers in a turbine cascade were measured, and the Nusselt numbers were obtained for the turbine endwall.
유속 및 열전대 위치의 영향을 고려한 열경계층 내부의 복합열전달 해석
이주안(Ju-An Lee),전병진(Byoung-Jin Jeon),최형권(Hyoug-Gwon Choi) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The error in measuring temperature profiles by thermocouple inside boundary layer mostly comes from the conduction heat transfer of the thermocouple. The error is not negligible when the conductivity of the thermocouple is very high. In this study, the effect of conduction heat transfer of the thermocouple on the temperature profile inside boundary layer was examined by considering both free-stream velocity and a thermocouple position. The conduction error of an E-type thermocouple was investigated by numerical analysis of three-dimensional conjugate heat transfer for various velocity profiles of boundary layer and thermocouple positions.
유속 및 열전대 위치의 영향을 고려한 열경계층 내부의 복합열전달 해석
전병진(B.J. Jeon),이주안(J.A. Lee),최형권(H.G. Choi) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.1
The error in measuring temperature profiles by thermocouple inside boundary layer mostly comes from the conduction heat transfer of the thermocouple. The error is not negligible when the conductivity of the thermocouple is very high. In this study, the effect of conduction heat transfer of the thermocouple on the temperature profile inside boundary layer was examined by considering both free-stream velocity and a thermocouple position. The conduction error of an E-type thermocouple was investigated by numerical analysis of three-dimensional conjugate heat transfer for various velocity profiles of boundary layer and thermocouple positions.
김한섭(Hanseob Kim),박규열(Kyuyeol Park) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
In this paper, spherical aberration and light concentrating efficiency of lens was measured. The measuring system is applying spherical aberration occurrence principal and could measure a temperature at focal plane by using the thermocouple. The sun which is located in infinite distance and could makes parallel ray is used as a i1luminant or heat source in experiments. It is confirmed that light concentrating efficiency of optical lens is in inverse proportion to spherical aberration and.
김성국,백운석,박찬엽,정성갑,유상대,박종식,송재원 경북대학교 센서기술연구소 1991 센서技術學術大會論文集 Vol.2 No.1
For the temperature measurement, we use the thermistor, thermosensor of IC type, piezoeletric infrared sensor, e.t.c.. In this paper, a portable pyrometer for high temperature measurement equipment was designed and fabricated by using K-type(chromel/alumel) thermocouple and IC(AD 595). Since IC(AD 595) thermosensor and K-type thermocouple have the nonlinearity, we compensated for nonlinearity by using EPROM(27C256). In compensated result, the measured error was ±2[℃], that is ±0.2[%], in the high temperature. In result, this Pyrometer is can used for all part that is required precise temperature measurement.
김한섭(Hanseob Kim),박규열(Kyuyeol Park) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.5
In this paper, spherical aberration and light concentrating efficiency of lens was measured. The measuring system is applying spherical aberration occurrence principal and could measure a temperature at focal plane by using the thermocouple. The sun which is located in infinite distance and could makes parallel ray is used as a illuminant or heat source in experiments. It is confirmed that light concentrating efficiency of optical lens is in inverse proportion to spherical aberration and.
김한섭(Hanseob Kim),박규열(Kyuyeol Park) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
In this paper, spherical aberration and light concentrating efficiency of lens was measured. The measuring system is applying spherical aberration occurrence principal and could measure a temperature at focal plane by using the thermocouple. The sun which is located in infinite distance and could makes parallel ray is used as a i1luminant or heat source in experiments. It is confirmed that light concentrating efficiency of optical lens is in inverse proportion to spherical aberration and.
김찬수(Chan-Soo Kim),홍성덕(Sung-Deok Hong),서동운(Dong-Un Seo),김용완(Yong-Wan Kim),이원재(Won Jae Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
When a thermocouple is placed in a high temperature gas-flow stream, the measured temperature could be biased from the true gas temperature due to a large radiation heat loss from a thermocouple surface to its surroundings. In this study, two thermocouples of unequal diameters with 1/8 inch and 1/16 inch are used to correct the radiation effect. The method is called the reduced radiation error (RRE). The preliminary test results show that the radiation and the sheath conduction cannot be negligible for the gas temperature measurement. To minimize the sheath conduction effect, all the thermocouples will have a grounded junction and 1/8 inch thermocouple will be replaced with 1 ㎜ thermocouples. In addition, the computational fluid dynamics code analysis shows that there is a negligible temperature difference between the positions where the thermocouples were installed.
철도 선로변 적용 흡음형 태양광 방음벽 모듈 내부 공간에서의 열분포 실험
장용준(Yong-Jun Jang),류지민(Ji-Min Ryu) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
철도 선로변에 적용하는 흡음형 태양광 방음벽 모듈 내부 공간에서 열분포를 실험적으로 조사하여 분석하였다. 흡음형 태양광 방음벽 모듈의 크기는 1,960mm ⅹ 1,000mm ⅹ 90mm(두께) 이다. 전면에는 66개의 solar cell이 장착이 되어 300W의 발전량을 가지고 있으며, 후면에는 흡음재가 적용되어 철도 소음을 흡음하도록 되어있다. 흡음재와 쏠라패널 사이에는 모듈내부에 열이 축적되지 않도록 48mm의 공간이 형성되어 있다. 모듈의 외곽 면에는 모듈 내부의 열이 외부로 배출되도록 홀이 천공이 되어 있으며, 홀의 크기는 7mm x 20mm 이며 양 측면에 각각 41개, 상단 및 하단 면에는 각각 57개의 홀이 있다. 본 연구에서는 전면의 쏠라 패널을 일정 온도(60℃)로 가열한 후 모듈 내부에서 열분포를 thermocouple을 이용하여 조사하였다. Experiment is performed for temperature distribution analysis inside module of noise-absorbing solar soundproofing wall applicable to railway. The size of module is 1,960mm ⅹ 1,000mm ⅹ90mm (thickness). The front is equipped with solar cells of 66 and generate 300W. The reverse side is equipped with noise-absorbing material which absorb railway noise. The inner space between solar panel and noiseabsorbing material is empty to remove the accumulated heat due to the solar panel and is 48mm. The outside of module has 41 holes on each left and right side and 57 holes on each up and down side to discharge the heat accumulated inside module. The size of hole is 7mmⅹ20 mm. The front solar panel is heated to be 60℃ and the heat distribution inside module is investigated using thermocouple.
류희승(Heeseung Ryu),김병준(Byeungjun Kim),임승호(Seungho Lim),차진호(Jinho Cha),김태준(Taejoon Kim),고윤호(Yun-Ho Ko),신원규(Weon Gyu Shin) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, the temperature field of condensing jet was measured using IR technique. IR images of the condensing jet were taken and analyzed to obtain its temperature field. Also, the temperature field of the jet was measured with a thermocouple. A good agreement between IR and thermocouple measurements was obtained.