• An automated design model is developed to generate impeller geometries suitable for organic Rankine cycles. The influence of tip clearance investigated and modeled. At high blade outlet angles, the effects flow rate on slip factor diminish. head rise decreases with ratio. Feedforward neural networks are trained loss coefficient unshrouded centrifugal pumps. In this paper, performance small-sc...

Axial flow circulating pumps (AFCPs) are large marine steam turbine units for large-sized ships. One peculiar operation condition AFCPs is when a ship cruises beyond certain speed, the energy of pump inflow can completely overcome frictional resisting moment itself, thereby driving impeller to rotate. Such also known as unpowered driven (UDC). At this time, fluid in artesian state. In paper, pr...

In this paper, the cavitating flow and pressure fluctuation in tip region were simulated based on Delayed Detached Eddy Simulation (DDES). The high-speed photography transient measurements employed to capture cavitation structures fluctuation. numerical results show a reasonable agreement with available experiments. maximum errors of head efficiency are 2.9% 2.2%. impeller rotation dominants fi...

Abstract It is known that a secondary effect of rotor-casing effusion cooling to modify and potentially spoil the rotor over-tip leakage flow. Studies have shown both positive negative impacts on high-pressure (HP) stage aerodynamic performance heat transfer, although there remains no consensus whether net beneficial when thermal effects are accounted for simultaneously. An has not been extensi...

An experimental investigation of the local film cooling effectiveness and heat transfer coefficient downstream of a row of elongated holes in a simulated axial turbine blade tip is presented. Film cooling is needed to protect the turbine blade tip region from high heat transfer rates, especially when cooling by convection is insufficient to keep the temperature distribution of the blade within ...

Alveolar trills are sounds produced by the self-oscillation of the tongue tip in the alveolar region. Specific aeroacoustic conditions around the lingual constriction are required to produce such sounds, but have not been fully investigated dueto the lack of physical modeling. This study discusses the possibility to model the tongue tip behavior with lumped mass-spring systems similar to those ...