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多點 피토관 流量計의 流量係數 測定에 관한 실험적 연구
임재명,윤복현 木浦大學校 工業技術硏究所 2000 工業技術硏究誌 Vol.10 No.-
The performance of multi-point Pitot tube flow-meter with diamond shape depending on the combination of upstream double elbows was experimentally studied. Actual flow-rates were measured by using ISA 1932 nozzles which are all standard flow-meters. Based on the measured flow-rates the flow coefficients of the multi-point flow-meter could be obtained. The flow coefficients calculated with all the front four holes open agree very well with those calculated by means of the average coefficient for the all holes. Furthermore, the flow coefficients were quite indifferent to Reynolds number variation for the region of ReD> 5.5×104. It is mostly due to the fact that the straightener installed upstream makes the flow more stable and straight than the case without the straightener ahead of the test section.
多點 피토관 流量計 周圍의 流動特性에 관한 실험적 연구
임재명,윤복현 木浦大學校 工業技術硏究所 2000 工業技術硏究誌 Vol.10 No.-
The flow characteristics passing a multi-point Pitot tube flow-meter with diamond shape were experimentally studied. ISA 1932 nozzles were used in order to measure average velocities in the pipe. A model of the same shape as the multi-point Pitot tube flow-meter with several holes perforated on its side was manufactured and tested to obtain pressure distributions around the test-piece. The combination of upstream double elbows varies the velocity profile and the position of maximum velocity and produces secondary flows and swirl. Especially, in case of 90˚ double elbows combination, swirl showed its maximum strength and anti-symmetric flow was also detected. The position of separation occurred at the same point all the time, in spite of various combinations of double elbows and for the entire range of Reynolds number tested in this study.
Cyclic 활성슬러지 공정을 이용한 돈사폐수의 영양소 제거특성
조용진,임재명,이호식 江原大學校 附設 環境硏究所 1999 環境硏究 Vol.16 No.-
The cyclic activated sludge process is a modified activated sludge using the sequencing batch reactor(SBR) operation that can achieve the combination of carbon oxidation and nutrient removal. The operational characteristics of cyclic activated sludge process include a time-sequenced operation of anaerobic/aerobic/anoxic condition in a single reactor to achieve a maximum efficiency. The application of cyclic activated sludge process is, however, usually focused on the low strength wastewater including domestic sewage. As a result, limited attention has given to the high strength wastewater, especially for the piggery wastewater. The primary objective of this study is to evaluate an optimum operational cyclic to achieve combination of organic and nutrient removal using the piggery wastewater. The factors affecting inhibitory effects on nitrification during the cyclic operation is further determined. The result of this study, optimum operational cyclic of activated sludge process is 1hr : 2hr A/O(anoxic/oxic) ratio. Also, It was efficient that the SRT is operated more than 10 days and the specific nitrification rates were 0.04~0.24 ㎎N/gMv/hr at 20℃. Nitrification inhibition of piggery wastewater was found to occur at an influent volumetric loading over 0.3 NH₄-N ㎏/㎥/d. After a biological treatment, remaining phosphorus removal experiments were executed in oxidized ferrous column. As a result, the experiment showed the high density of variation in concentration by contact time on air. As for column aeration, completely phosphorus removal time was 25 minutes in contact time on air(20 hr) with aeration and 400 minutes(w/aeration) and 580 minutes(w/o aeration) in contact time on air(0 hr) respectively.