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박원희(Park Won-Hee),장용준(Jang Yong-Jun),김동현(Kim Dong-Hyeon),박승일(Park Seung-Yil) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The free flow of fine bubbles generated by electrolysis and smoke flow in a space enclosed by fire were recently found to show the same tendency thus leading to the introduction of a research technique. The research experimentally models smoke diffusion and flow in parallel and slanted tunnels using the fine hydrogen bubbles generated by electrolysis in a water tank. Visualization laser with wavelength of 532nm and output power of 1000mW is used to visualize effectively the cross section of fine hydrogen bubble flows generated in a model tunnel.
모형시험장치를 이용한 철도 선로변 방음벽에 미치는 공력 특성시험
장용준(Jang Yong-Jun),김동현(Kim Dong-Hyeon),박원희(Park Won-Hee),박승일(Park Seung-Yil) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The experiments for aerodynamic characteristics on railway acoustic screen are performed using 1/61 scale-down mock-up facility. The train model for the experiment is high speed train (KTX) and the tested speed is about 300km/h. The tested train length is about 61cm which is corresponding to two units of train. The strength of pressure wave is measured using piezo typed pressure sensor. The measured pressure is compared with field test data and UIC 779-1 values.