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자유유동 난류강도가 원형 곡면위의 분사홀 상류에서의 막냉각에 미치는 영향에 대한 연구
서형준,국건,이준식,이상우,Seo, Hyeong-Joon,Kuk, Keon,Lee, Joon-Sik,Lee, Sang-Woo 대한기계학회 1994 대한기계학회논문집 Vol.18 No.3
The leading edge of a turbine blade was simulated as a circular cylindrical surface. The effect of free-stream turbulence on the mass transfer upstream of the injectionhole has been investigated experimentally. The effects of injection location, blowing ratio on the Sherwood number distribution were examined as well. The mass transfer coefficients were measured by a naphthalene sublimation technique. The free-stream Reynolds number based on the cylinder diameter is 53,000. Other conditions investigated are: free-stream turbulence intensities of 3.9% and 8.0%, injection locations of $40^{\circ}$, $50^{\circ}$, and $60^{\circ}$ from the front stagnation point of the cylinder, and blowing ratios of 0.5 and 1.0. The role of the horseshoe vortex formed upstream edge of the injected jet is dicussed in detail. When the blowing ratio is unity, and the coolant jet is injected at $40^{\circ}$, the mass transfer upstream of the jet is not affected by the coolant jet at all. On the other hand, when the injection hole is located beyond $50^{\circ}$, the mass transfer upstream edge of the injection hole suddenly increases due to the formation of the horseshoe vortex, but it dereases as the free-stream turbulence intensity increases because the strength of the horseshoe vortex structure becomes weakened. The role of the horseshoe vortex is clearly evidenced by placing a rigid rod at the injection hole instead of issuing the jet. In the case of the rigid rod, the spanwise Sherwood number upstream of the injection hole is much larger due to the intense influence of the horseshoe vortex.
송우석(Woo-Seog Song),서형준(Hyeong-Joon Seo),김종문(Jong-Moon Kim),김영재(Young-Jae Kim),서용호(Yong-Ho Seo),주영주(Youngju Joo),황준(Jun Hwang) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
In this study, we introduced the improved airflow-direction-control-method without the control-blade using PCM(Pressure Control Method) and the new indoor unit of cassette type air conditioner as its actual application. In order to demonstrate the feasibilities of PCM, we defined the two plane - the pressure difference forming plane, and flow direction control plane - in 2-Dimensional domain and analyzed the control factor and the effect. Because the direct wind of 4-way cassette cause discomfort and is often unable to reach all areas evenly, we developed the circular type cassette by this technology which distribute fast and even airflow in all directions. We examined the thermal comfort index ADPI(Air Diffusion Performance Index) in the residential space about two types. Experimental result shows that circular type is 13% higher than 4-way type due to high-efficiency flow control and even air distribution.
임병국(Lim Byong Guk),장용희(Jang Yong Hee),김은석(Kim Eun Suk),서형준(Seo Hyeong Joon) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This study aimed to improve the performance of the System Air-conditioner and describe energy savings under actual condition using artificial intelligence(AI) technology. The performance of the system air conditioner has improved dramatically compared to the existing products by improving the technology of each component part like compressor, fan, heat exchanger, and so on. In addition, since air conditioning equipment has a large difference in energy consumption depending on the ambient temperature, humidity, installation condition, and usage pattern, energy can be saved through intelligent technology by optimal control algorithm. Since air conditioning equipment accounts for 44% of the energy used in buildings, it is expected to have a high impact in terms of overall energy consumption reduction.