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최진형(J.H. Choi),이재민(J.M. Lee),도덕희(D.H. Doh),조효제(H.J. Jo),Kiyomi Suzuki,Shinji Kato 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Characteristics between the loads and the three-dimensional flow behaviors of a fish-shape power generating system have been investigated. The constructed system have been tested under the current speed 1.5knot. The flow features of three fish models (horse mackerel, mackerel, perch) has been tested. The width of the blade installed around the body is 50㎜. The flows around the models have been investigated by using 3D-PTV. Further, the load test has been carried out at the same flow conditions. Among the models it has been verified that the S65 is most appropriate for power generations.
도덕희(D.H. Doh),조효제(H.J. Jo),조경래(K.R. Cho),문경록(K.R. Moon),이재민(J.M. Lee),황태규(T.G. Hwang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A new 3D-PTV algorithm (a Volume PTV) based upon a hybrid fitness function has been constructed. A coherency fitness function is introduced using the information of space and time to sort out the correct particle pairs between the two camera images. The measurement system consists of two-high-definition-cameras(1k × 1k), a Nd-Yag laser and a host computer. The developed algorithm has been employed to investigate the flow features of the cylinder wake. The Reynolds numbers with the cylinder diameter (d=10㎜) are 360, 720, 900 and 1260. Two-dimensional displacements of the particles of each camera’s image and neighbouring constraints were introduced to reduce the calculation loads. More than 10,000 instantaneous 3D vectors have been obtained by the constructed algorithm. The constructed algorithm could recover more than 80~90% of the particle numbers in the image.
도덕희(Doh D.H.),조효제(Jo H.J.),김병열(K. B.Y.),문경록(Moon K.R.),이창제(Lee C.J.) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
A simultaneous measurement system for the velocity field and the pressure field of fluid flows is constructed. The measurement system consists of a PIV system and a pressure measurement system. The pressure fields are calculated by using the velocity field obtaind by the PIV system and the reference pressure measured simultaneously at a reference point. The flow field around a rectangular bluff body square is investigated, and the characteristics between the flow fields and the pressure field near the body are discussed.