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분사제트 온도변화에 따른 벽면충돌 현상에 대한 실험적 연구
최현훈(Hyeonhun Choi),우루노유미(Yumi Uruno),김상호(Sangho Kim),정재원(Jaewon Chung) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In order to remove dissolved oxygen and carbon dioxide from feedwater in power generation facilities, boilers and incinerators, deaerators are essential. In actual deaerator, temperature of spray is about 145°C and the surrounding temperature is about 177°C (steam temperature). It is necessary to analyze the temperature in order to improve the efficiency of deaerator. In this paper, splashed fraction and jet breakup according to the distance from nozzle were studied. Also, Liquid film shapes on the vertical wall are visualized and analyzed using highspeed camera. These were obtained at different temperature respectively. As temperature increases, ξ(splashed fraction) becomes smaller overall. Also, the value of ξ<SUB>max</SUB>(maximum of splashed fraction) decreases as the temperature increases. The Rayleigh regime, the first wind-induced regime, and the second wind-induced regime were confirmed by jet breakup images. The phenomenon that <SUB>max</SUB> decreased with increasing temperature was visualized and confirmed. It was confirmed that the diameter of the liquid film becomes larger as the temperature rises. That is, ξ decreases because droplets spread on the wall and the thickness of the liquid film becomes thinner. Therefore, when the temperature of water rises, ξ decreases. The results of this paper are used to increase the efficiency of actual deaerator and provide data for design and optimization.