• 한국산학기술학회논문지
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• 제15권12호
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• pp.7380-7384
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• 2014

피난방화문이란 기존에 성능을 인정받은 방화문의 전면에 축광도료를 바르고 손잡이 부근에는 시온도료를 발라 제작한 방화문으로 기존에 방화설비로만 사용되었던 방화문에 피난 및 안전 기능을 추가, 방화문 자체가 피난설비로서의 기능을 겸용하는 설비이다. 피난안전방화문의 휘도는 기존의 유도표지 휘도(60분후 7mcd)이상의 성능으로 한국소방산업기술원의 휘도시험을 통과한 설비로, 화재 시 가시성의 면적이 피난구유도등에 비해 크며 연기의 하강에도 방화문 아랫부분의 방광상태가 관찰되어 피난자들의 피난유효 시간을 연장시켜 줄 것으로 사료된다. 손잡이 부근에 발라져 있는 시온도료는 일정온도에 도달하면($70^{\circ}C$) 색상이 변화 위험경고가 방화문 바탕에 나타나게 되어 화재 시 피난자들이 방화문 손잡이에 입을 수 있는 1차 재해를 예방할 수 있으며, 화재공간에 진입을 하여야 하는 소방관들에게는 역화 가능성을 사전에 인지 안전 사고를 예방하는데 도움을 줄 것으로 판단된다.

• Corrosion Science and Technology
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• 제21권2호
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• pp.121-129
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• 2022

A study on water-based epoxy coated on mild steel using the electroplating method was conducted to optimize the process parameters for dry film thickness to achieve superior paint quality at optimal cost in an automotive plant. The regression model was used to adjust various parameters such as electrode voltage, bath temperature, processing time, non-volatile matter, and surface area to optimize the dry film thickness. The average dry film thickness computed using the model was in the range of 15 - 35 ㎛. The error in the computed dry film thickness with reference to the experimentally measured dry film thickness value was - 0.5809%, which was well within the acceptable limits of all paint shop standards. Our study showed that the dry film thickness on mild steel was more sensitive to electrode voltage and bath temperature than processing time. Further, the presence of non-volatile matter was found to have the maximum impact on dry film thickness.

• 한국유체기계학회 논문집
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• 제15권1호
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• pp.5-12
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• 2012

In this paper, the heat transfer coefficient measurement techniques using TSP(temperature sensitive paint) were introduced and the results of a comparative study on the heat transfer coefficient measurement by steady state and transient TSP techniques were discussed. The distributions of heat transfer coefficient by a single $60^{\circ}$ inclined impingement jet on a flat surface were measured by both techniques. Tested Reynolds number based on the jet diameter (d) was 30,000 and the distance between jet exit and target plate (L) was fixed at 10d. Results showed that the measured Nusselt number by both techniques indicated significant difference except near the center of impingement jet. Also, the heat transfer coefficients measured by the transient TSP technique were affected by the reference temperature of the jet. Based on the measured data, characteristics of both TSP techniques were analyzed and suggestions for applying them were also given.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2007년도 제29회 추계학술대회논문집
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• pp.329-334
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• 2007

고온 환경에서 작동하는 가스터빈 블레이드의 열부하 감소를 위해 다양한 냉각법이 적용되고 있다. 블레이드 외부에서는 작은 홀을 통해 저온의 냉각유체를 분사시키는 막냉각법이 사용되는데, 블레이드 내부의 정확한 온도 예측을 위해서는 작동 조건과 위치에 따른 막냉각 효율을 정확히 산출하여야 한다. 본 연구에서는 압력에 따라 반사되는 빛의 강도를 달리하는 압력감응페인트를 이용하여 평판에서의 막냉각 효율을 측정하였다. 그 결과, 압력감응페인트를 이용한 막냉각 계수 측정법은 상세한 막냉각 계수의 분포를 측정 가능케 하였다. 0.5, 1, 2의 세 가지 분사비가 실험에 적용되었고, 분사비가 커질수록 막냉각 홀 근처의 막냉각 계수는 감소하였지만 하류의 막냉각 계수는 증가하였다.

• International Journal of Aeronautical and Space Sciences
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• 제11권3호
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• pp.193-200
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• 2010

Through experimental investigations utilizing hypersonic shock tunnel-coaxial thermocouples as well as blow down hypersonic wind tunnel-temperature sensitive paints, the heat flux and the temperature over a protuberance were measured and analyzed. The experimental data were subsequently compared to heat flux data that was obtained by using blow down hypersonic wind tunnel and heat flux gauges. According to the comparison, both sets of data illustrated correlation with one another. The measured heat flux was large when the height of the protuberance was large. Experimental results show that heat flux measurements taken at higher locations were greater than those taken at lower locations. For high protuberances, a severe jump in the heat flux was observed, ranging in values within 0.6-0.7 of the height of the protuberances. However, when the protuberance was sufficiently short, a rise in the heat flux was rarely observed as the protuberance was totally submerged under the separation region.

• 한국항공우주학회지
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• 제37권10호
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• pp.967-974
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• 2009

임펄스식 극초음속 충격파 풍동과 동축열전대, 불어내기식 극초음속 풍동과 온도감응페인트(TSP)를 이용하여 돌출물 전면 및 주위에서의 온도 및 열유속 계측 실험을 수행하였다. 측정된 실험 결과를 기 수행된 불어내기식 풍동과 열유속 게이지를 이용한 열유속 측정 결과와 비교하였다. 각각의 세 가지 기법의 결과가 서로 잘 일치함을 확인하였으며, 실험 결과로부터 돌출물 전면에서의 열전달 특성을 보다 명확하게 관찰할 수 있었다. 측정된 열유속 데이터로부터 공력가열 현상은 돌출물 전면 상부에서 크게 발생하며 돌출물의 크기가 작을수록 매우 미비해짐을 관찰할 수 있다. 돌출물의 크기가 큰 경우, 돌출물 높이 0.6~0.7 지점부터 열유속이 크게 증가한 반면, 돌출물의 높이가 충분히 작은 경우는 돌출물 자체가 전방의 박리 영역에 완전히 잠기면서 열유속이 크게 증가하는 지점이 관찰되지 않았다.

• 한국유체기계학회 논문집
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• 제15권2호
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• pp.5-11
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• 2012

In this paper, the heat transfer coefficient measurement techniques using TSP(temperature sensitive paint) were introduced and the results of a comparative study on the heat transfer coefficient measurement by steady state and transient TSP techniques were discussed. The distributions of heat transfer coefficient by a single $60^{\circ}$ inclined impingement jet on a flat surface were measured by both techniques. Tested Reynolds number based on the jet diameter (d) was 30,000 and the distance between jet exit and target plate (L) was fixed at 10d. Results showed that the measured Nusselt number by both techniques indicated significant difference except near the center of impingement jet. Also, the heat transfer coefficients measured by the transient TSP technique were affected by the reference temperature of the jet. Based on the measured data, characteristics of both TSP techniques were analyzed and suggestions for applying them were also given.