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안승광,이인원,성형진,Ahn, Seung-Kwang,Lee, In-Won,Sung, Hyung-Jin 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.12
An experimental study was made of a large-scale vortical structure over a backward-facing step. The Reynolds number based on the step height was R $e_{H}$ =33,000. To recognize the large-scale vortex, three components of velocity were measured. The measurements were performed in the recirculation zone (x/H=4.0) and the reattachment zone(x/H=7.5). To measure the wall pressure fluctuations in a turbulent flow over a backward-facing step, a 32-channel microphone array was installed beneath the wall in the streamwise and spanwise directions. From the measured pressure field, the size of large-scale vortex was obtained. As a detailed study, a conditionally-averaging technique was employed to characterize the coherent structure of the large-scale vortex. To see the relationship between the flow field and the relevant spatial mode of the pressure field, the spatial box filtering (SBF) was examined. A cross-correlation between velocity and pressure fluctuations was performed to identify the structure and the length scale of the large-scale vortex.x.
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안승광,김윤진,김기선 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.2
This experiment examined the effects of heating hour at 29°C to maintain the vegetative growth and to inhibit premature inflorescence initiation in two stages, immature (6-month-old) and mature (1-year-old), Phalaenopsis hybrids in order to save heating expenses. Plants of Phalaenopsis Norman’s Jade ‘Green Apple’ and Doritaenopsis Queen Beer ‘Mantefon’ at 6-month-old and 1-year-old were grown in separate growth chambers with heating at 29°C for 6, 12, 18, and 24 hours. The photoperiod was 16/8 hours (day/night) consisting of 12 hours PPFD at 120 ± 10µmol・m-2・s-1 (06:00-18:00 HR) with 4 hours PPFD at 25 ± 10 µmol・m-2・s-1 (18:00-22:00 HR) as a photoperiod-extension. Inflorescence initiation was inhibited in 6-month-old ‘Green Apple’ regardless of the heating hour treatments. However, inflorescence initiation of ‘Mantefon’ at both stages and ‘Green Apple’ at 1-year-old was inhibited only when the plants were exposed at least for 12 hours at 29°C. Overall, the inflorescence initiation of the plants was inhibited or delayed more in 6-month-old plants than 1-year-old plants. Leaf span of the plants was similar among 12, 18, and 24 hours-29°C treatments, except for 6 hours-29°C treatment. In conclusion, it is recommended that high temperature heating at 29°C for at least 12 hours during the day could increase vegetative growth sufficiently and prevent premature inflorescence initiation completely, even though nigh temperature decreased to 20°C in Phalaenopsis hybrids at immature stage. These approaches could be used to save heating cost during the winter season cultivation.
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