TY - JOUR
T1 - Investigation of Unsteady Boundary Layer Induced by Propagating Compression Wave
T2 - (1st Report, Experiment Using Laser Differential Interferometry)
AU - Aoki, Toshiyuki
AU - Mashimo, Shinya
AU - Kondoh, Nobuaki
AU - Matsuo, Kazuyasu
PY - 1994
Y1 - 1994
N2 - The unsteady boundary layer induced by propagating compression wave has been investigated by means of a recently developed laser differential interferometry (LDI) method using Wollaston prisms. The difference of the two detector signals in LDI will therefore be essentially free of vibrations and laser output variations. LDI can be made more sensitive to optical path changes by 2 to 3 orders of magnitude than in classical interferometry. The sensitivity was sufficiently high to record the density variations by compression waves. The measurements of the time-dependent profiles gave detailed information on the process of formation of the unsteady boundary layer induced by propagating compression wave in a constant-area duct. It was found that the laminar-to turbulent transition in unsteady boundary layer flow, which describes the density profiles at a strength of the initial compression wave from 9 kPa, exists.
AB - The unsteady boundary layer induced by propagating compression wave has been investigated by means of a recently developed laser differential interferometry (LDI) method using Wollaston prisms. The difference of the two detector signals in LDI will therefore be essentially free of vibrations and laser output variations. LDI can be made more sensitive to optical path changes by 2 to 3 orders of magnitude than in classical interferometry. The sensitivity was sufficiently high to record the density variations by compression waves. The measurements of the time-dependent profiles gave detailed information on the process of formation of the unsteady boundary layer induced by propagating compression wave in a constant-area duct. It was found that the laminar-to turbulent transition in unsteady boundary layer flow, which describes the density profiles at a strength of the initial compression wave from 9 kPa, exists.
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U2 - 10.1299/kikaib.60.2287
DO - 10.1299/kikaib.60.2287
M3 - Article
AN - SCOPUS:0028461510
SN - 0387-5016
VL - 60
SP - 2287
EP - 2292
JO - Transactions of the Japan Society of Mechanical Engineers Series B
JF - Transactions of the Japan Society of Mechanical Engineers Series B
IS - 575
ER -