Measurements of flow and mass transfer over a blunt-faced flat plate in pulsating flow

Laboratory measurements in low turbulence-intensity wind tunnel were made of flow and mass transfer over a blunt flat plate of finite thickness, which is placed in a pulsating free stream, U = U-o(1 + A(o)cos2 pi f(p)t). The majority of experiments were carried out in the ranges of 1000 less than or equal to Re-H less than or equal to 7000 and 20.0 less than or equal to f(p) less than or equal to 80.0 Hz and A(o) less than or equal to 0.13. Flow properties were measured by I-type and split-film probes. Mass transfer rates were measured by employing the naphthalene sublimation technique. The present results for non-pulsation flows (A(o) = 0.0) were shown to be consistent with the published data. For pulsating approach flows, as A(o) or f(p) increases, the time-mean reattachment length is reduced significantly; the position where C-p is recovered moves upstream, and the minimum value of C-p decreases; the secondary separation point and the position where Sh has a maximum move further upstream. Especially in the zone of separation bubble, the effect of pulsation on Sh is conspicuous. At large Re-H, the relative influence of pulsation on Sh weakens.