Abstract The relatively large sampling volume of acoustic Doppler velocimeters (ADVs) is expected to influence their measurement turbulence. To study this effect, a series experiments using different sizes was conducted in an axisymmetric turbulent jet. results show that the mean velocities are not significantly affected by size volume. On other hand, reducing increase variances u and ? velocit...

Abstract In order to provide design parameters for the micro-initiation train of built-in MEMS Safety and Arming Device, solve reliable transmission problem due small charge amount. Based on structure micro initiating explosive sequence, test device is designed in paper. The photon Doppler Velocimeter (PDV) was used velocity flyer driven by micro-detonator, influence flyer, acceleration chamber...

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...

Abstract To explore the application of micro-sized B-Al (boron-aluminum) compound powder in enhanced blast explosive(EBX) and thermobaric explosive(TBX), three HMX-based explosives containing (PF-1, PF-2 PF-3)were designed prepared. The ignition combustion characteristics various samples (micro- nano-sized B, powders without with HMX) under different pressures atmospheres were studied by a lase...

An ultrasound instrument has been developed that combines a real-time cross-sectional imaging system and a spectrum analyzer-based Doppler velocimeter. This combination allows the Doppler sample volume to be superimposed on the cross-sectional image of the heart so that the sample volume can be located accurately. The same 2.2 MHz transducer utilized for cross-sectional imaging is stopped mecha...