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문경록(K. R. Moon),도덕희(D.H. Doh),조효제(H.J. Jo),조경래(G.R. Cho),김병열(B.Y. Kim),황태규(T.G. Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The wakes of a cylindrical body upon which a flexible plate has been attached have been investigated. The plate is made of silicon with configurations of 50㎜(W) × 150㎜(L) × 0.3㎜(T). The cylinder wakes have been tested with PIV experiments under the conditions with and without the flexible plate. The diameter of the installed cylinder body is 30㎜ and the Reynolds numbers are 2730, 6160 and 9750 wi th the diameter. The measurement system consists of an Ar-ion laser(6W), a high speed camera(1024 × 992 pixel, 500fps) and a host computer. FFT analyses have been carried out using the velocity vectors obtained by PIV measurements at the point X/D=1.52 and Z/D=0.52. It has been verified that the flexible plate suppresses or damps the vortices separated from the cylinder body, which makes the cylinder's wakes stable. With increase of Re numbers the intensity of the dominant frequency of the wakes become smaller.
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.