The research of hypersonic process is limited by the transition model, turbulence and computational complexity. At present tunnel test still a better way to investigate than fluid dynamic (CFD) method. In this work, principle structure all-fiber photon Doppler velocimeter (PDV) are introduced. PDV based on laser effect consists an Mach Zehnder interferometer optical antenna. measurement accurac...

We report on experiments on the effects of air bubbles on ultrasound velocity measurements in fluids. We used an acoustic Doppler velocimeter system for measuring the three velocity components in a single point and an acoustic Doppler velocimetry profiler system for measuring axial velocity in several points along the beam. The results suggest that both systems essentially measure the velocity ...

Measurements of three-dimensional turbulent flow in the exit head section of a shell-andtube heat exchanger were performed using three-component laser Doppler velocimeter. The test geometry is half of a hemispherical cap with two outlet-tubes and with a cylindrical inlet section. Distributions of the velocity vector field, the three mean velocity components, and the Reynolds stress components a...

In the present study, enhancement of liftoff and blowout a propane/air coflowing diffusion flame by water mist was experimentally investigated in subsonic range. When fuel injection velocity U f is low, an attached laminar stabilized at burner rim with premixed base. An increase leads to flame, eventually lifted flame. The upstream disappears turbulent downstream region. stability deteriorates ...

the effect of a combined system of the bed suction and jet injection as a pier-scour countermeasure on the turbulent flow field is studied in a laboratory flume using an acoustic doppler velocimeter (adv). the three components of the velocities in the vertical symmetry plane in the equilibrium scour hole in front and rear of the pier under 3-jet injections and bed suction rate qs/q0 = 2%located...

In this report we present our progress of the NRA 02-OSS-01 project on the development of a prototype Dust Particle Analyzer (DPA) and its performance under simulated Martian atmospheric conditions. Both theoretical analysis assuming the predicted environmental conditions of Mars and experimental data on the development of the DPA show that the instrument has an excellent potential for its appl...