A pipe water hammer with column separation was studied in a range of flow rates (Re=465 to 2239) test rig an acrylic glass observation section. Pressure transients were measured piezoresistive pressure sensors, while the gas evaporation and condensation captured by high-speed recording Photron SA-Z at frame rate 75,000 fps. Separation lengths estimated threshold value images. The results did no...

We investigated the propagation of turbulent fronts in pipe flow at high Reynolds numbers by direct numerical simulation. used a technique combining moving frame reference and an artificial damping to isolate short periodic pipes, which enables us explore bulk number up Re = $10^5$ with affordable computation power. measured speed downstream front observed that fit $1.971-(Re/1925)^{-0.825}$ (i...

In mobile devices such as aircraft and electric vehicles, due to limited space, there are strict requirements on the volume weight of compressor mounted vehicle. Therefore, high-speed scroll compressors have attracted more attention because their small size light weight. this paper, numerical calculations analysis three-dimensional (3D) transient flows in a refrigeration were established valida...

A nonlinear ensemble-variational data assimilation is performed in order to estimate the unknown flow field over a slender cone at Mach 6, from isolated wall-pressure measurements. The cost functional accounts for discrepancies spectra and total intensity between experiment prediction using direct numerical simulations, as well our relative confidence measurements estimated state. We demonstrat...