Diesel Spray 특성에 관한 실험적 연구

허종철,이규영,양옥룡 대한기계학회 1991 대한기계학회 춘추학술대회 Vol.- No.-

환기조건 및 관수에 따른 단동 플라스틱 하우스의 냉방효과와 열환경 분석

허종철,임종환,서효덕,최동호 한국생물환경조절학회 2000 시설원예‧식물공장 Vol.9 No.1

본 실험에 앞서, 하우스 4개동에 대한 대칭성 실험을 실시하였으나, 각 하우스간에는 최대1$^{\circ}C$이내의 작은 온도차만이 계측되었다. 하우스 개폐장치 조작 불능시를 가정하여 천.측창을 인위적으로 폐쇄한 경우, 하우스 내 온도는 외 기온보다 약 16$^{\circ}C$ 높은, 즉 사실상 작물이 생육 할 수 없는 고온상태를 나타내었다. 천.측창을 개방한 상태에서는 환기팬을 추가로 가동시키더라도 이에 따른 추가적인 실온저하는 관찰되지 않았다. 비교적 분무 입경이 큰 스프링클러에 의한 환수시의 냉각효과를 검토한 결과, 하우스 내 온도는 스프링클러 작동과 동시에 급속히 하강함으로서, 관수는 하우스 실온저하에 크게 기여하고 있음이 확인되었다. 스프링클러 관수시와 비관수시로 구분하여 하우스 내 열환경을 비교한 결과, 관수시와 비관수시 모두 하우스의 천.측창을 개방하여 외기를 도입한 경우가 하우스 실온 저하에 효과적으로 작용한 것으로 조사되었다. 하우스 내 작물 체감온도에 근사한 온도지표인 실내 흑구온도는 비관수시의 경우 실내 공기온도보다 현저히 놀게 나타났으나, 관수시의 온도는 실내 공기온도에 근접한 온도를 나타내었다. 비관수시 천.측창을 개방한 경우 하우스 내 온도분포는 연직방향, 수평방향 모두 1$^{\circ}C$ 정도의 극히 작은 온도차만이 계측됨으로서, 하우스 내는 극히 균일한 온도를 유지하고 있음이 확인되었다 In this study, we quantitatively compare the cooling effects of single span plastic greenhouses by opening or shutting of toot and side vents, and operation of fan or sprinkler. With those variables, we simultaneously made experiments at 4 greenhouses under equivalent conditions. By the experiments, the shutting of roof and side vents caused the high temperature difference of indoor and outdoor which the crops cannot be cultivated. However, the opening of the windows effectively reduced the indoor temperature and showed uniform temperature distribution in the greenhouses. The sprinkler abruptly reduced the indoor temperature, and showed excellent cooling effects. Finally, this paper provides the fundamental data for environmental control in greenhouses.

분위기 압력이 디젤분무특성에 미치는 영향

허종철,고경남 濟州大學校 産業技術硏究所 1996 산업기술연구소논문집 Vol.7 No.1

An experimental study has been carried out to investigate the influences of injection pressure and ambient pressure on diesel spray. Especially, diesel sprays were visualized by means of double flash. The visualized spray volumes at the ambient pressure of 3MPa increase more steeply with respect to the elapsed injection time than the atomospheric pressure. The spray tip penetration is increased according to higher injection pressure and lower ambient pressure. When the ambient pressure is further increased, the transition of the spray tip penetration occurs earlier. And the spray tip velocity increases with higher injection pressure but decreases with higher ambient pressure. The spray cone angle does not vary with increasing injection time, but it depends significantly on the ambient pressure.

Gas Turbine 연소기 개발에 관한 기초연구 - 미연소유동장의 유동특성 -

허종철,이근오,양옥용 대한기계학회 1983 대한기계학회 춘추학술대회 Vol.- No.-

유전 알고리즘을 이용한 이중 모수추정 자료동화기법

허종철,이용희,이희춘,장동언,박선기 한국기상학회 2007 한국기상학회 학술대회 논문집 Vol.2007 No.-

混合燃料로 史用한 農用小型 디이젤 機關의 性能에 관한 硏究(Ⅱ) : Rape Seed Oil 10%,Diesel Oil 90% 油菜油10% 輕油90%

高長權,許鐘哲 제주대학교 1984 논문집 Vol.18 No.-

(1) 디이젤機關用 代替燃料로서 混合油를 選擇한 動機를 提示하였으며 混合油의 디이젤機關 燃料로서의 特性을 檢討하였다. (2) 混合油로서 디이젤機關을 運轉할 경우 디이젤油에 比하여 燃料消費量이 若干 增加하였으며 長時間 運轉할 경우 燃燒室의 카아본 堆積이 가장 어려운 問題로 登場할 것으로 思料된다. (3) 排氣溫度와 騷音은 混合油가 디이젤油보다 若干 낮았다. Performance tests of small diesel engine for farm use using mixture fuel oil as a fuel were carried out and the following results were obtained. (1) In the case of rated-horse power operation, the fuel consumption of mixture fuel oil showed overage 5.1 percent larger than of light oil. (2) Exhaust gas temperature of mixture fuel oil was average 12.5℃ lower than that of light oil in the continuous c1 using test. (3) Noise of mixture fuel oil and light oil were almost equal for each condition. (4) Other performance (at starting, at no load performance of maximum and minium engine speed) using mixture fuel oil were almost equal to those of light oil. (5) In the case of long-time operation as a mixture fuel oil, carbon deposit of combustion chamber is regarded as difficult problem.

Scoria, Trachyte, Styropor의 保溫 斷熱性에 關한 實驗的 硏究(Ⅱ)

權麒麟,許鐘哲 제주대학교 1986 논문집 Vol.22 No.-

In this paper, we tried to compare Scoria and Trachyte with Styropor in the effect of insulator for the purpose of the economic utilization of natural resources. The results of this study may be summarized as follows; 1. The properties of temperature variation in model rooms, (ⅰ) The temperature increases in the order of Styropor, Scoria, Trachyte. (ⅱ) The temperature decreases in the order of Trachyte, Scoria, Styropor. 2. The effects of temperature variation, (ⅰ) When the temperature increases Scoria and Styropor showed almost the same effect or variation. (ⅱ) When the temperature decreases Trachyte and Scoria showed almost the same variation or effect. 3. Temperature variations in accordance to the pass of time, (ⅰ) When the temperature rises, it increases sharply for the first 80 minutes, but gradually since then. (ⅱ) When the temperature falls, it decreases gradually for the first 60 minutes, but sharply since then.

풍력 발전 시스템의 피치제어

강상수,강승균,임종환,허종철 濟州大學校工科大學産業技術硏究所 1999 尖端技術硏究所論文集 Vol.10 No.1

Wind turbine system converts wind energy into electric energy. Since the velocity of wind is random in nature, control of the angular velocity of the blade is necessary in order to generate high quality electric power. The control of the blade can be divided into the stall regulation type and the pitch control type. The stall regulation type which utilizes an aerodynamic stall is simple and cheap, but it suffers from fluctuation of the resulting power. On the contrary, pitch control type is based on the fact that the torque of the blade can be changed by varying the pitch angle of the blade. It is mechanically and mathematically complicated, but the control performance is better than that of the stall regulation type. This paper derives a mathematical modeling of the wind turbine system, and suggests a pitch control algorithm. The validity of the algorithm is demonstrated with the results produced through sets of experiments.

분위기 압력이 디젤분무특성에 미치는 영향

고경남,허종철 濟州大學校工科大學産業技術硏究所 1996 尖端技術硏究所論文集 Vol.7 No.1

An experimental study has been carried out to investigate the influences of injection pressure and ambient pressure on diesel spray. Especially, diesel sprays were visualized by means of double flash. The visualized spray volumes at the ambient pressure of 3MPa increase more steeply with respect to the elapsed injection time than the atomospheric pressure. The spray tip penetration is increased according to higher injection pressure and lower ambient pressure. When the ambient pressure is further increased, the transition of the spray tip penetration occurs earlier. And the spray tip velocity increases with higher injection pressure but decreases with higher ambient pressure. The spray cone angle does not vary with increasing injection time, but it depends significantly on the ambient pressure.

제주도에서의 풍력에너지 이용을 위한 공학적 예측에 관한 연구(1) : On the Characteristics of Wind Speed 풍속특성에 관하여

高長權,許鐘哲 제주대학교 1986 논문집 Vol.22 No.-

This paper examined the characteristics of wind speed from the self-recording paper which had been measured at local weather stations at Cheju, Seogui, Sungsan and Daejung from Oct. 1984 to Sep. 1985 by computerizing the 10-minute average wind speeds according to monthly and regional items. The results are as follows; 1. We counted the monthly Weibull parameters(k, c) throughout the same period described above from Cheju, Seogui, Sungsan and Daejung stations. 2. The measurment of the Weibull parameters at intervals of 10 minutes per hour gave almost all the same estimating values. Even if we calculate the Weibull parameters for any 10 minutes per hour, there appears to be no significant difference. 3. When the monthly average wind speed distribution is low, it is clear that a Weibull function is well fitted to the data when observations of calm cannot be included in calculation of p(v).