Yong-qing Li,1 Peter Lynam,2 Min Xiao,3 and Paul J. Edwards1 1Advanced Telecommunications Research Centre, Faculty of Information Sciences and Engineering, University of Canberra, P.O. Box 1, Belconnen, ACT 2616, Australia 2Department of Physics, University College, University of NSW, ADFA, ACT 2600, Australia 3Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701 (Receive...

We present the first characteristics of air flow measurements in the mixed convective region with strong buoyancy effects (Gr/Re 1), using a thermal silicon double-Wheatstonebridge vector sensor. The Alternating Direction Method is applied to eliminate additive drift influences. The upper limit on the mixed convective region is experimentally defined to be given by Gr/Re = [0:3–0:8]. Flow veloc...

Laser-Doppler velocimetry measurements through a one millimeter hole in the casing of an annular turbine cascade were performed in the endwall region downstream of the blade row. Complementary threehole pressure probe measurements were also taken downstream of the nozzle blades, as well as blade surface pressure measurements. The object of this study was to devise methods for the measurement cl...

The spatial structure of a swirling turbulent flow has been investigated based on the three-component laser Doppler anemometry method in an isothermal laboratory model four-vortex furnace. vortex cores with shape deformed vertical elliptical cylinder is visualized using ?minimum total pressure? criterion. spectrum velocity pulsations indicates absence unsteady periodic structures, which means o...

Laser-Doppler Anemometry (LDA) is used to measure the velocity of gases and liquids with observations irregularly spaced in time. Equidistant resampling turns out to be better than slotting techniques. After resampling, two ways of spectral estimation are compared. The first estimate is a windowed periodogram and the second is the spectrum of a time series model. That is an estimated autoregres...

A theoretical and experimental study of the spin-over mode induced by the elliptical instability of a flow contained in a slightly deformed rotating spherical shell is presented. This geometrical configuration mimics the liquid rotating cores of planets when deformed by tides coming from neighboring gravitational bodies. Theoretical estimations for the growth rates and for the non linear amplit...

The interaction between wakes of bluff body and airfoil have profound influences on system performance in many industrial applications, e.g., turbo-machinery and cooling fan. The present work investigates the effect of configuration include; airfoil’s angle of attack, transverse and inline spacing of the models, on frequency behavior of the cylinder’s near-wake. The experiments carried on under...

Turbulence studies were made in the wake of a rotating circular cylinder in a uniform free stream. The interest was to examine the turbulence properties at the suppression of periodicity in vortex formation process. An experimental study of the turbulent near wake of a rotating circular cylinder was made at a Reynolds number of 9000 for velocity ratios, λ between 0 and 2.7. Hot-wire anemometry ...

We present a combined Direct Numerical Simulation and Hot Wire Anemometry study of an axisymmetric turbulent wake. The data lead to a revised theory of axisymmetric turbulent wakes which relies on the mean streamwise momentum and turbulent kinetic energy equations, self-similarity of the mean flow, turbulent kinetic energy, Reynolds shear stress and turbulent dissipation profiles, non-equilibri...