Large-eddy simulation (LES) using an unstructured overset numerical method is performed to study the flow around a ducted marine propeller for highly unsteady off-design condition called crashback. Known as one of most challenging states analyse, rotates in reverse direction yield negative thrust while vehicle still forward motion. The LES results David Taylor Model Basin 4381 with neutrally lo...

To study the effect of tip clearance on unsteady flow in a tubular turbine, full-channel numerical calculation was carried out based SST k–ω turbulence model using power-plant prototype as research object. Tip leakage characteristics three δ schemes were compared. The results show that value is directly proportional to axial velocity, momentum, and sum but inversely turbulent kinetic energy. At...

Internal steam leakage in turbines from the high-pressure side to low-pressure through clearances causes loss, resulting reduced efficiency and potentially compromising safe operation of turbine. Therefore, a comprehensive understanding flow characteristics blade tip is crucial improve turbines. In this paper, last stage blades cylinder certain 600 MW ultra-supercritical turbine unit were studi...

To understand the effect of cavitation on tip leakage vortex (TLV), turbulent cavitating flows were numerically investigated using shear-stress transport (SST) k–ω turbulence model and Zwart–Gerber–Belamri model. In this work, two computations performed—one without other with cavitation—by changing inlet pressure pump. The results showed that had little difference between blade surfaces for a c...

This study aimed to investigate the influence of bleeding position a self-circulating casing on aerodynamic performance transonic centrifugal compressor. Three types structures with positions 11% Ca (the axial chord length blade tip), 14% and 20% from leading edge were studied by using numerical simulation method, Krain impeller taken as research object. It was found that all three self-recircu...